52671 + Interview Questions in Chemistry in Class 11

1.	Statement-1:Spector ions are the species that are present in the solution but do not part in the reaction Becauseltbr Statement-2: The phenomena of formation of H_(2)O_(2) by theoxidation of H_(2)O is known as auto-oxdation
Answer» `PbO_(2)` `H_(2)O_(2)` `SrO_(2)` `BaO_(2)` Answer :B::C::D

Discussion

2.	Statement-1:Permanent hardness in water is removed by treatment with washing soda. Statement-2: Washing soda reacts with magnesium and calcium sulphate to from insouble carbonates.
Answer» SOLUTION :(a) STATEMENT 2 is the CORRECT EXPLANATION for statement-1

Discussion

3.	Statement-1:In NaCl crystal, all the octahedral voids are occupied by Na^+ ions Statement-2:The number of octahedral voids is equal to the number of Cl^- ions in the packing
Answer» Statement 1 is TRUE , Statement-2 is True , Statement-2 is a correct EXPLANATION for statement-1 Statement 1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation of Statement-1 Statement-1 is True , Statement-2 is False Statement -1 is False , Statement -2 is True Solution :Correct explanation .`NA^+` IONS can be placed only in the octahedral voids. (Tetrahedral voids are too small to accommodate them ).

Discussion

4.	Statement-1.H_(2)O_(2) reduces potassium ferricyanide in alkaline medium. Statement-2. Whenever H_(2)O_(2) acts as a reducing agent, O_(2) is always produced.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a correct explanation for statement-6 Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-6 Statement-1 is True, Statement -2 is FALSE Statement -1 is False , Statement-2 is True. Solution :Correct explanation. During the process `H_(2)O_(2)` is oxidised to `O_(2)`

Discussion

5.	Statement-1.During isothermal expansionof an ideal gas, there is no change in the internal energy. Statement -2.During isothermal expansion of an ideal gas , as temperature remains constant, no heat enters or leaves the system.
Answer» Statement -1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION of Statement-1 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement -1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True Answer :c

Discussion

6.	Statement-1:Decomposition of H_(2)O_(2) is a dispoportionation reaction. Statement-2:H_(2)O_(2) undergoes simultaneous oxidation and reduction reactions.
Answer» SOLUTION :(a) Statement-2 is the CORRECT EXPLANTION for statement-1

Discussion

7.	Statement-1:Colour of lead paintings can be restored by washing with dilute solution of H_(2)O_(2) Statement-2: Hydrogen sulphide oxdises black lead sulphide to white lead sulphate.
Answer» SOLUTION :(a) Statement-2 is the CORRECT EXPLANTION for statement-1

Discussion

8.	Statement-1:Boiling point temperature of H_(2)O_(2) is little more than of H_(2)O. Statement-2: Dipole moment of H_(2)O_(2) is little more than of H_(2)O
Answer» Solution :(b)Correct EXPLANATION. The EXTENT of hydrogen bonding in `H_(2)O_(2)` molecules is more than in `H_(2)O` molecules is more than in `H_(2)O` molecules.

Discussion

9.	Statement-1:Bromobenzene upon reaction with Br_2//Fe gives 1,4-dibromobenzene as the major product. Statement-2:In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT EXPLANATION of Statement-1. Statement-1 is True, Statement-2 is True , Statement-2 is NOT a correct explanation of Statement-1. Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2 is True Answer :C

Discussion

10.	Statement-1:Beryllium hydride is of covalent nature. Statement-2:The electronegativity difference between Be and H is very large.
Answer» Solution :(C ) CORRECT Statement-2: The electronegativity DIFFERECE between Be and H atoms is quite small.

Discussion

11.	Statement-1: When Na_(2)CO_(3) is titrated against HCl in presence of phenolphthalein indicator, it is converted to NaCl. Statement-2: Phenolphathalein shows colour change in the pH range of
Answer» STATEMENT-1 is true, statement -2 is true, statement-2 is a CORRECT explanation for statement-1. Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1. Statement-1 is true, statement-2 is FALSE. Statement-1 is false, statement-2 is true. Answer :C

Discussion

12.	Statement-1 : When Na reacts with H_2O, H_2 gas is release. Statement-2 : P_4O_(10) on hydrolysis produce H_3PO_3.
Answer» If both the statements are True and statement-2 is the CORRECT EXPLANATION of statement-1 If both the statements are True and statement-2 is not the correct explanation of statement-1 If statement-1 is true and statement-2 is false If statement-1 is false and statement-2 is true ANSWER :C

Discussion

13.	Statement-1 : Water can act as acid as well as base. Statement-2 : Water can accept as well as donate H^+ ion.
Answer» If both the STATEMENTS are TRUE and statement-2 is the CORRECT explanation of statement-1 If both the statements are True and statement-2 is not the correct explanation of statement-1 If statement-1 is true and statement-2 is false If statement-1 is false and statement-2 is true Answer :A

Discussion

14.	Statement-1 : Washing soda (Na_2CO_3) is use to remove temporary hardness. Statement-2 : Clark's method is used to remove temporary hardness.
Answer» If both the statements are True and statement-2 is the correct EXPLANATION of statement-1 If both the statements are True and statement-2 is not the correct explanation of statement-1 If statement-1 is true and statement-2 is FALSE If statement-1 is false and statement-2 is true ANSWER :D

Discussion

15.	Statement-1. Vapour pressure of liquid ammonia is higher than that of water. Statement-2. Molar mass of ammonia is less than that fo water.
Answer» Statement-1 is CORRECT, Statement-2 is correct , Statement-2 is the correct explanation for Statement-1. Statement-1 is correct, Statement-2 is correct , Statement-2 is not a correct explanation of Statement-1. Statement-1 is correct, Statement-2 is incorrect. Statement-1 is incorrect, Statement-2 is correct. Solution :Correct statement. Hydrogen bonding in `NH_(3)` is WEAKER than that in `H_(2)O` molecules.

Discussion

16.	Statement-1. Vapour pressure of liquid ammonia is more than that iof water. Statement-2. Molar mass of ammonia is less than that of water.
Answer» Statement-1 is true, statement-2 is also true, statement-2 is correct explanation of statement-3 Statement-1 is true, statement-2 is also true, statement-2 is not correct explanation of statement-3 Statement-1 is true, statement-2 is true. Statement-1 is FALSE, statement-2 is true. Solution :Correct statement-2. INTERMOLECULAR hydrogen bonding in `NH_(3)` mulecular is LESS than in `H_(2)O` MOLECULES.

Discussion

17.	statement-1 :Total number of moles in a closed system at new equilibrium is less than the old equilibrium if some amount of a substace is removed form a system [consider a reaction A(g)hArrB(g)at equilibrium. statement-2: The number of moles of the substance which if removed , is paritcally compensated as the system reached to new equilibrium.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statment-2is True ,Statement-2is not a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2 is True. Answer :B

Discussion

18.	Statement-1. Toluene on sulphonation gives m-toluenesulfonic acid. Statement-2. Sulphonation is a reversible reaction.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is a correct EXPLANATION for Statement-1 Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1 Statement- 1 is True, Statement-2 is FALSE Statement-1 is False, Statement -2 is True SOLUTION :Correct statement-1. TOLUENE on sulphonation give a MIXTURE of o- p- toluenesulphonic acids.

Discussion

19.	Statement-1. TlCl_(3) is more stablethat TlCl. Statement-2. +1 oxidation state of Tl is more stable than +3.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT explanation for statement-1. Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :Correct statement-1. TLCL is more stable than`TlCl_(3)`.

Discussion

20.	Statement-1. There is a natural asymmetry between converting work to hwat and converting heat to work. Statement-2. No process is possible in which the sole result is the absorption of heat from are servior and its complete conversion into work.
Answer» STATEMENT -1 is True, Statement-2 is True, Statement-2 is a correct EXPLANATION of Statement-1 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement -1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True Answer :a

Discussion

21.	Statement-1 : The vapour pressure of 0.1 M Hg_(2)Cl_(2) is equal to 0.1 M AlCl_(3) solution Statement-2 : 0.1 AlCl_(3) and 0.1 Hg_(2)Cl_(2) give different numbers of ions in a solution.
Answer» Statement-1 is TRUE , statement-2 is true , statement-2 is a CORRECT EXPLANATION for statement-2 Statement-1 is true , statement-2 is true , statement-2 is not a correct explanation for statement-2 Statement-1 is true , statement-2 is FALSE Statement-1 is false , statement-2 is true Answer :D

Discussion

22.	Statement-1. The value of van der Waals constant 'a' is higher for ammonia than for nitrogen. Statement-2 Intermoleucular hydrogen bonding is percent in ammonia.
Answer» Statement-1 is CORRECT, Statement-2 is correct , Statement-2 is the correct EXPLANATION for Statement-1. Statement-1 is correct, Statement-2 is correct , Statement-2 is not a correct explanation of Statement-1. Statement-1 is correct, Statement-2 is INCORRECT. Statement-1 is incorrect, Statement-2 is correct. ANSWER :A

Discussion

23.	statement-1 : The reaction quotient,Q has the same form as the equilibrium constant K_(eq), and is evaluated using any given concentration of the species involved in the raction, and not necessarily equilibrium concentrations. statement-2 : If the numerical value of Q is not the same as the value of equillibrium constant, a reaction will occur.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statment-2is True ,Statement-2is not a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2 is True. Answer :B

Discussion

24.	Statement-1. The reaction of conc. HNO_3 and conc. H_2SO_4 on nitrobenzene gives m- dinitrobenzene. Statement-2. The nitro group in benzene ring decreases the electron density in the benzene ring.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a correct EXPLANATION for Statement-1 Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1 Statement- 1 is True, Statement-2 is False Statement-1 is False, Statement -2 is True Solution :Correct explanation. The nitro group in nitrobenzene mainly DECREASES the electron DENSITY at o- an p-positions and HENCE is m-directing.

Discussion

25.	Statement-1. The radii of corresponding orbitals in all H-like particles are equal Statement-2 All H-like particles contain only one electron.
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-4 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-4 Statement-1 is True, Statement-2 is False Statement-1 is False, Statement-2 is True Solution :Correct statement-1. The radii of the corresponding orbits of H-like particles depend UPON the atomic NUMBER (Z) and are not equal

Discussion

26.	Statement-1. The pressure of a fixed amount of an ideal gas is proportional to its temperature. Statement-2. Frequencyof collisions and their impact both increase in proportion to the square root of the temperature.
Answer» Statement-1 is CORRECT, Statement-2 is correct , Statement-2 is the correct EXPLANATION for Statement-1. Statement-1 is correct, Statement-2 is correct , Statement-2 is not a correct explanation of Statement-1. Statement-1 is correct, Statement-2 is INCORRECT. Statement-1 is incorrect, Statement-2 is correct. ANSWER :A

Discussion

27.	Statement-1. The pressure inside the LPG cylinder remains constant even what it is in use at room temperature. Statement-2. Pressure on the liquid is independent of its mass.
Answer» Statement-1 is TRUE, statement-2 is ALSO true, statement-2 is CORRECT EXPLANATION of statement-2 Statement-1 is true, statement-2 is also true, statement-2 is not correct explanation of statement-2 Statement-1 is true, statement-2 is true. Statement-1 is FALSE, statement-2 is true. Solution :Statement-2 is the correct explanation for statement-1.

Discussion

28.	Statement-1. The pK_(a) of a weak acid becomes equal to pH of the solution at the mid-point of its titration. Statement-2. The molar concentrations of proton acceptor and proton donor become equal at mid point of a weak acid.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is the CORRECT EXPLANATION of Statement - 1 . Statement-1 is True, Statement - 2 is True , Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :Statement-2 is the correct explanation of statement -1, because `pH = pK_(a) +log.(["Salt"])/(["Acid"])`. At mid POIND, [Salt] = [Acid].

Discussion

29.	Assertion (A) :The equilibrium is not static but a dynamic one. Reason (R ) : The chemical equilibrium is an apparent state of rest in which two opposing reactions are proceeding at the same rate.
Answer» If both the STATEMENTS are true and STATEMENT -2 is the correct EXPLANATION of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is FALSE If statement-I is false and statement-2 is true. Answer :A

Discussion

30.	Statement-1: The octahedral voids have double the size of the tetrahedral voids in a crystal. Statement-2: The number of tetrahedral voids is double the number of octahedral voids in a crystal
Answer» Statement 1 is TRUE , Statement-2 is True , Statement-2 is a correct EXPLANATION for statement-1 Statement 1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation of Statement-1 Statement-1 is True , Statement-2 is False Statement -1 is False , Statement -2 is True Solution :Correct statement-1. Octahedral VOIDS are larger in SIZE than tetrahedral voids but not double in size. Statement-2 is correct.

Discussion

31.	Statement -1 : The octahedral voids have double the size of the tetrahdedral voidsof the tetrahedral voids in a crystal. Statement -2 : The number of tetrahedral voids is bouble the number of octahedral voids in a crystal.
Answer» STATEMENT 1 is TRUE , Statementy -2 True , Statement -2 is a correct explanation for statement -1 . Statement 1 is True , Statement -2 is True , Statement -2 in NOT a correct explanation of statement -1. Statement -1 is True , Statement -2 is False. Statement -1 is False , Statement -2 is True. Solution :Correct Statement -1 . Octahedral VOIDS are larger in SIZE than tetrahedral voids but not DOUBLE in size. Statement-2 is correct.

Discussion

32.	Statement-1. The opposite lobes of a p-orbital have opposite sign whereas oppositelobes of d-orbital have the same sign Statement-2 The opposite lobes of a p-orbital have opposite charge whereas opposite of lobes of d-orbital have the same charge
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct explanation for Statement-3 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-3 Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2 is True Solution :Correct statement-2. The + and -sign represent the sign of the wave FUNCTION and nor the sign of CHARGES.

Discussion

33.	Statement-1. The number of radial nodes in 3s and 4p orbitals is not equal. Statement-2 The number of radial nodes in any orbital depends upon the values of 'n' and 'l' which are different for 3s and 4p orbitals
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-5 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-5 Statement-1 is True, Statement-2 is False Statement-1 is False, Statement-2 is True Solution :Correct Statement-1. Number of radial NODES in any orbital `= n-l -1`. THUS, they depend upon 'n' and 'l' but 3s, `n -l -1 =3 - 0 - 1= 2` and for 4p, `n -l -1 = 4 - 1 - 1 = 2`

Discussion

34.	Each question contains STATEMENT-1 (Assertion) and STATEMENT-2( Reason). Examine the statements carefully and mark the correct answer according to the instruction given below: STATEMENT-1: The melting point of ice decreases with increase of pressure. STATEMENT-2: Ice contracts on melting .
Answer» If both the statements are true and statement -2 is the correct explanation of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is FALSE If statement-I is false and statement-2 is true. ANSWER :A

Discussion

35.	Statement-1 : The ionisation constants of weak diprotic acid are in theorder of Ka_(1) gt Ka. Statement-2 : Removal of H^(+) from anion is difficult as compared to neutral atom.
Answer» If both the STATEMENTS are true and STATEMENT -2 is the correct explanation of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is FALSE If statement-I is false and statement-2 is true. Answer :A

Discussion

36.	Statement-1 . The IUPAC name of the compound {:(CH_(2)=CH-CH=CH-CH-C-=CH),("\|"),(""CH=CH_(2)),("5-ethynylhepta-1,3,6-triene"):} Statement-2. While numbering the carbon chain triple bond is given preference over the double bond.
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a correct EXPLANATION for statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is False Solution :Correct statement-2. Double bonds are given preference over TRIPLE bonds.

Discussion

37.	Statement-1. The guache conformation of ethylene glycol is more stable than its anti conformation Statement-2. The gauche conformation is stabilized by H-bonding.
Answer» STATEMENT-1 is True, Statement-2 is True , Statement-2 is a correct EXPLANATION for Statement-1 Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1 Statement- 1 is True, Statement-2 is FALSE Statement-1 is False, Statement -2 is True Answer :A

Discussion

38.	Statement -1 : The gas phase reaction PCl_(3)(g)+Cl_(2)(g) hArr PCl_(5)(g) shifts to the right on increasing pressure. Statement-2 : When pressure increase, equilibrium shifts towards more number of moles.
Answer» If both the statements are true and STATEMENT -2 is the CORRECT EXPLANATION of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is FALSE If statement-I is false and statement-2 is true. Answer :C

Discussion

39.	Assertion (A): The endothermic reactions are favoured at lower temperature and the exothermic reactions are favoured at higher temperature. Reason (R ) : when a system in equilibrium is disturbed by changing the temperature, it will tend to adjust itself so as to overcome the effect of the change.
Answer» If both the STATEMENTS are TRUE and STATEMENT -2 is the CORRECT explanation of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is false If statement-I is false and statement-2 is true. Answer :D

Discussion

40.	Statement 1 The electrochemical cell stopsworking after sometime Statement 2The electrode potential of both the electrodes becomes zero
Answer» If both assertion and REASN are TRUE and reason is the true EXPLANATION of the assertion If both assertion and reason are true but reason is not the true explanation of the assertion If assertion is true but reason is false If both assertion and reason are false Solution :Correct statement 2 ELECTRODE potential of both the electrodes become equal

Discussion

41.	statement-1 :The dissociatiohn of CaCO_(3) can be represented as, CaCO_(3)(s)hArrCaO(s)+CO_(2)(g). Some solid CaCO_(3) is placed in an evacurted vessel enclosed by a piston and heated so that a portion of it decomposes. If the piston is moved so that the volume of the vessel is doubled, while the tempratuere is held constant, the number moles of CO_(2) in the vessel increase. statement-2 : The pressure of CO_(2) in the vessel will remain the same.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statment-2is True ,Statement-2is not a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2 is True. Answer :A

Discussion

42.	Statement-1. The colour of old lead paintings can be restored by washing with a dilute solution of H_(2)O_(2). Statement-2. Hydrogen peroxide oxidises black lead sulphide to white lead sulphate.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a correct explanation for statement-5 Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-5 Statement-1 is True, Statement -2 is FALSE Statement -1 is False , Statement-2 is True. Answer :A

Discussion

43.	Statement-1. The boiling point of NH_(3)lies between that of SbH_(3) and BiH_(3) . Statement -2. PH_(3) has much lower boiling than NH_(3) but it increases from PH_(3)toAsH_(3) to SbH_(3) to BiH_(3) due to increase in van dar Waals forces
Answer» Statement-1 is Ture , Statement-2 is Ture , Statement-2 is a correct explanation for Statement-1. Statement-1 is Ture , Statement-2 is Ture , Statement-2 is nota correct explanation for Statement-1. Statement-1 is TRUE , Statement-2 isFalse . Statement-1 is False, Statement-2 is True. Solution :Correct STATENT -1 .BOILING point of `NH_(3)` is lessltbgt than that of `BiH_(3)` as well as `SbH_(3)`

Discussion

44.	Statement-1. tert-Butyl carbanion is less stable than methyl carbanion. Statement-2-. The +1-effect of the CH_(2) groups tends to stabilize the tert-butyl carbanion.
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation for statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is False Solution :Correct statement-2. +I-effect of the `CH_(3)` GROUPS tends to DESTABILIZE the tert-butyl carbanion.

Discussion

45.	STATEMENT-1: STATEMENT-2: There is no chiral carbon inthis compound.
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-11 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :GIVEN compound is non-resolvable due to amine INVERSION.

Discussion

46.	STATEMENT-1: STATEMENT-2: No symmetry element is present in above compound.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-9 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :N//A

Discussion

47.	STATEMENT-1: STATEMENT-2: Molecules containing plane of symmetry or centre of symmerty are optically inactive.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-6 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :N//A

Discussion

48.	STATEMENT-1: STATEMENT-2:
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-13 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :N//A

Discussion

49.	Statement-1: Sparingly soluble salts AB and XY_(2) with the same solubility product, will have different solubility. Statement 2: Solubility of sparingly soluble salts depends upon solubility product.
Answer» If both the STATEMENTS are true and STATEMENT -2 is the correct EXPLANATION of statement-I If both the statements are true but statement-2 is not the correct explanation of statement-I If statement-I is true and statement-2 is FALSE If statement-I is false and statement-2 is true. Answer :B

Discussion

50.	Statement-1 . Sodium reacts with oxygen to form Na_(2)O_(2) but potassium reacts with oxygen to form KO_(2). Statement-2 . Potassium is more reactive than sodium .
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :Correct explanation . Due to BIGGER size of `K^(+)` than `Na^(+)`, it has a weak positive FIELD around it which cannot prevent peroxide ION `(O_(2)^(2-))` to combine with another oxygen atom to FORM superoxide , `O_(2)^(-)` .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Statement-1:Spector ions are the species that are present in the solution but do not part in the reaction Becauseltbr Statement-2: The phenomena of formation of H_(2)O_(2) by theoxidation of H_(2)O is known as auto-oxdation

Statement-1:Permanent hardness in water is removed by treatment with washing soda. Statement-2: Washing soda reacts with magnesium and calcium sulphate to from insouble carbonates.

Statement-1:In NaCl crystal, all the octahedral voids are occupied by Na^+ ions Statement-2:The number of octahedral voids is equal to the number of Cl^- ions in the packing

Statement-1.H_(2)O_(2) reduces potassium ferricyanide in alkaline medium. Statement-2. Whenever H_(2)O_(2) acts as a reducing agent, O_(2) is always produced.

Statement-1.During isothermal expansionof an ideal gas, there is no change in the internal energy. Statement -2.During isothermal expansion of an ideal gas , as temperature remains constant, no heat enters or leaves the system.

Statement-1:Decomposition of H_(2)O_(2) is a dispoportionation reaction. Statement-2:H_(2)O_(2) undergoes simultaneous oxidation and reduction reactions.

Statement-1:Colour of lead paintings can be restored by washing with dilute solution of H_(2)O_(2) Statement-2: Hydrogen sulphide oxdises black lead sulphide to white lead sulphate.

Statement-1:Boiling point temperature of H_(2)O_(2) is little more than of H_(2)O. Statement-2: Dipole moment of H_(2)O_(2) is little more than of H_(2)O

Statement-1:Bromobenzene upon reaction with Br_2//Fe gives 1,4-dibromobenzene as the major product. Statement-2:In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.

Statement-1:Beryllium hydride is of covalent nature. Statement-2:The electronegativity difference between Be and H is very large.

Statement-1: When Na_(2)CO_(3) is titrated against HCl in presence of phenolphthalein indicator, it is converted to NaCl. Statement-2: Phenolphathalein shows colour change in the pH range of

Statement-1 : When Na reacts with H_2O, H_2 gas is release. Statement-2 : P_4O_(10) on hydrolysis produce H_3PO_3.

Statement-1 : Water can act as acid as well as base. Statement-2 : Water can accept as well as donate H^+ ion.

Statement-1 : Washing soda (Na_2CO_3) is use to remove temporary hardness. Statement-2 : Clark's method is used to remove temporary hardness.

Statement-1. Vapour pressure of liquid ammonia is higher than that of water. Statement-2. Molar mass of ammonia is less than that fo water.

Statement-1. Vapour pressure of liquid ammonia is more than that iof water. Statement-2. Molar mass of ammonia is less than that of water.

Statement-1. Toluene on sulphonation gives m-toluenesulfonic acid. Statement-2. Sulphonation is a reversible reaction.

Statement-1. TlCl_(3) is more stablethat TlCl. Statement-2. +1 oxidation state of Tl is more stable than +3.

Statement-1. There is a natural asymmetry between converting work to hwat and converting heat to work. Statement-2. No process is possible in which the sole result is the absorption of heat from are servior and its complete conversion into work.

Statement-1 : The vapour pressure of 0.1 M Hg_(2)Cl_(2) is equal to 0.1 M AlCl_(3) solution Statement-2 : 0.1 AlCl_(3) and 0.1 Hg_(2)Cl_(2) give different numbers of ions in a solution.

Statement-1. The value of van der Waals constant 'a' is higher for ammonia than for nitrogen. Statement-2 Intermoleucular hydrogen bonding is percent in ammonia.

Statement-1. The reaction of conc. HNO_3 and conc. H_2SO_4 on nitrobenzene gives m- dinitrobenzene. Statement-2. The nitro group in benzene ring decreases the electron density in the benzene ring.

Statement-1. The radii of corresponding orbitals in all H-like particles are equal Statement-2 All H-like particles contain only one electron.

Statement-1. The pressure of a fixed amount of an ideal gas is proportional to its temperature. Statement-2. Frequencyof collisions and their impact both increase in proportion to the square root of the temperature.

Statement-1. The pressure inside the LPG cylinder remains constant even what it is in use at room temperature. Statement-2. Pressure on the liquid is independent of its mass.

Statement-1. The pK_(a) of a weak acid becomes equal to pH of the solution at the mid-point of its titration. Statement-2. The molar concentrations of proton acceptor and proton donor become equal at mid point of a weak acid.

Assertion (A) :The equilibrium is not static but a dynamic one. Reason (R ) : The chemical equilibrium is an apparent state of rest in which two opposing reactions are proceeding at the same rate.

Statement-1: The octahedral voids have double the size of the tetrahedral voids in a crystal. Statement-2: The number of tetrahedral voids is double the number of octahedral voids in a crystal

Statement -1 : The octahedral voids have double the size of the tetrahdedral voidsof the tetrahedral voids in a crystal. Statement -2 : The number of tetrahedral voids is bouble the number of octahedral voids in a crystal.

Statement-1. The opposite lobes of a p-orbital have opposite sign whereas oppositelobes of d-orbital have the same sign Statement-2 The opposite lobes of a p-orbital have opposite charge whereas opposite of lobes of d-orbital have the same charge

Statement-1. The number of radial nodes in 3s and 4p orbitals is not equal. Statement-2 The number of radial nodes in any orbital depends upon the values of 'n' and 'l' which are different for 3s and 4p orbitals

Each question contains STATEMENT-1 (Assertion) and STATEMENT-2( Reason). Examine the statements carefully and mark the correct answer according to the instruction given below: STATEMENT-1: The melting point of ice decreases with increase of pressure. STATEMENT-2: Ice contracts on melting .

Statement-1 : The ionisation constants of weak diprotic acid are in theorder of Ka_(1) gt Ka. Statement-2 : Removal of H^(+) from anion is difficult as compared to neutral atom.

Statement-1 . The IUPAC name of the compound {:(CH_(2)=CH-CH=CH-CH-C-=CH),("|"),(""CH=CH_(2)),("5-ethynylhepta-1,3,6-triene"):} Statement-2. While numbering the carbon chain triple bond is given preference over the double bond.

Statement-1. The guache conformation of ethylene glycol is more stable than its anti conformation Statement-2. The gauche conformation is stabilized by H-bonding.

Statement -1 : The gas phase reaction PCl_(3)(g)+Cl_(2)(g) hArr PCl_(5)(g) shifts to the right on increasing pressure. Statement-2 : When pressure increase, equilibrium shifts towards more number of moles.

Assertion (A): The endothermic reactions are favoured at lower temperature and the exothermic reactions are favoured at higher temperature. Reason (R ) : when a system in equilibrium is disturbed by changing the temperature, it will tend to adjust itself so as to overcome the effect of the change.

Statement 1 The electrochemical cell stopsworking after sometime Statement 2The electrode potential of both the electrodes becomes zero

Statement-1. The colour of old lead paintings can be restored by washing with a dilute solution of H_(2)O_(2). Statement-2. Hydrogen peroxide oxidises black lead sulphide to white lead sulphate.

Statement-1. The boiling point of NH_(3)lies between that of SbH_(3) and BiH_(3) . Statement -2. PH_(3) has much lower boiling than NH_(3) but it increases from PH_(3)toAsH_(3) to SbH_(3) to BiH_(3) due to increase in van dar Waals forces

Statement-1. tert-Butyl carbanion is less stable than methyl carbanion. Statement-2-. The +1-effect of the CH_(2) groups tends to stabilize the tert-butyl carbanion.

STATEMENT-1: STATEMENT-2: There is no chiral carbon inthis compound.

STATEMENT-1: STATEMENT-2: No symmetry element is present in above compound.

STATEMENT-1: STATEMENT-2: Molecules containing plane of symmetry or centre of symmerty are optically inactive.

STATEMENT-1: STATEMENT-2:

Statement-1: Sparingly soluble salts AB and XY_(2) with the same solubility product, will have different solubility. Statement 2: Solubility of sparingly soluble salts depends upon solubility product.

Statement-1 . Sodium reacts with oxygen to form Na_(2)O_(2) but potassium reacts with oxygen to form KO_(2). Statement-2 . Potassium is more reactive than sodium .