52671 + Interview Questions in Chemistry in Class 11

1.	Assertion(A): Lactic acid is optically active compound Reason (R): It contains a chiral centre with plane of symmetry
Answer» both A and R are true and R is CORRECT explanation of A both A and R are true and R is not correct explanation of A A is true but R is false A is false but R is true Solution :`CH_(3)-underset(OH)underset(\|)overset(H)overset(\|)C-COOH` it is optically ACTIVE due to the PRESENCE of chiral CENTER it has no plane of symmetry

Discussion

2.	Statement I : Combustion of all organic compounds is exothermic in nature. Statement II : The enthalpies of all elements in their standard states are zero.
Answer» both ASSERTION and Reason are TRUE and Reason is the correct EXPLANATION of Assertion both Assertion and Reason are true and Reason is notcorrect explanation of Assertion both Assertion and Reason are FALSE Assertion is false but Reason is true ANSWER :B

Discussion

3.	Assertion: ZSM-5 is used as a catalyst in petrochemical industries. Reason: Zeolites are three dimensional network Silicates in which some silicon atoms are replaced by aluminium atoms.
Answer» if both assertion and REASON are TRUE and the reason is the correct explanation of the assertion. if both assertion and reson are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Solution :Both assertion and reason are true but reason is not the correct explanation of assertion. ZSM-5 converts alcohols directly into GASOLINE (Petrol) by DEHYDRATING them so that a mixture of hydrocarbons is FORMED.

Discussion

4.	Assertion. Zinc blende and wurtzite both have fcc arrangement of sulphide ions. Reason. A unit cell of both has four formula units of ZnS
Answer» If both assertion and reason 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 A. ZINC blende has fcc arrangement of `S^(2-)` ions while wurtzite has hexagonal CLOSE PACKING arrangement of `S^(2-)` ions. Correct R. A unit cell of zinc blende has 4 FORMULA units while that of wurtzite has 6 formula units of ZnS

Discussion

5.	Assertion : Zinc diplaces copper from copper suphate solution Reason: The E^(@) of Zn is- 0.76 V and that of Cu is +0.34 V.
Answer» If both ASSETION and RESON are corect and reason is correct explanation for assertion If both assetion and reason are correct but reason is not correct explanation for assertion If ASERTION is correct but reason is INCORRECT If both assetion and reason are incorrect SOLUTION :Reason is the correct explanation for assetion

Discussion

6.	Assertion. Zinc blende and wurtzite both have fcc arrangement of sulphide ions. Reason.A unit cell of bothhas four formula units of ZnS.
Answer» Solution :CorrectR. Zinc blende has fcc arrangement of `S^(2-)`ions while wurtzite has HEXAGONAL, close packing arrangement of `S^(2-)`ions. CORRECT R. A UNIT cell of zine blende has 4 formula unit while that of wurzite has 6 formula units of ZnS.

Discussion

7.	Assertion : Zeolites are the three-dimensional network silicates. Reason : Negative charge on zeolite structure is neutralised by positively charged AI^(3+) ions.
Answer» SOLUTION :ZEOLITES are the three-dimensional aluminosilicates in which few Si atoms are replaced by AI atoms. The Acquired NEGATIVE charge on zeolite structure is balanced by cations such as `NA^(+), K^(+)` or `CA^(2+)`, etc.

Discussion

8.	Assertion: Wurtz reaction is not preferred for the preparation of alkanes containing odd number of carbon atoms. Reason: It is not possible to prepare alkanes with odd number of carbon atoms through wurtz reaction.
Answer» If both assertion and reson are TRUE and reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Wurtz reaction is not PREFERRED for the PREPARATION of alkanes containing odd number of carbon atoms since many side products are formed and a MIXTURE of alkanes is formed because both alkyl halides react with each other and ALSO with themselves.

Discussion

9.	Assertion: Wolframite impurity is separated from tin stone (SnO_(2)) by magnetic separation. Reason: Tin stone is ferromagnetic and is attracted by the magnet.
Answer» Both A and R AR true and R is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation ofA A is true but R is FALSE A is false but R is true Solution :WOLFRAMITE is ferromagnetic and is attacted by the magnet.

Discussion

10.	Assertion : Windowpanes of old building become thicker at the bottom than at the top .Reason : Glass is an extremely viscous liquid .
Answer» If both ASSERTION and REASON are true and reason is the correct EXPLANATION of assertion . If both assertion and reason are true but reason is NOTTHE correct explanation of assertion . If assertion is true but reason is FALSE . If both assertion and reason are false . Solution :Glass being viscous, flows down at the bottom.

Discussion

11.	Assertion . When two hydrogen atoms approach each other to form a cavalent bond , nearly435.8 KJ mol^(-1) of energy is released . Reason .When two atoms approach eachother to form a covalent bond between them, potential energy of the system is released .
Answer» If both ASSERTION and reason are CORRECT, and reason is the correct explanation of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is incorrect . If both assertion and reason are incorrect. Solution :Correct R . When two atoms approach each other to form a covalent BOND between them , potential ENERGY of the system FIRST decreases and then increases .

Discussion

12.	Assertion : When sodium hydride in fused state is electrolysed, hydrogen is dicharged at anode. Reason : Sodium hydride is an electrovalent compound in which hydrogen is present as cation.
Answer» If both assertion and REASON are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. SOLUTION :SODIUM hydride is an electrovalent compound in which hydrogen is PRESENT as an anion, `H^(-)` which is discharged as `H_(2)` at anode on electrolysis.

Discussion

13.	Assertion. When NO reacts with FeSO_(4) a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is 6.
Answer» If both assertion and reason are TRUE, and is the CORRECT explanation of the assertion. If both assertion and reason are true, but reason is not the correct explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct explanation. The brown colour is DUE to FORMATION of charge transfer complex between NO and `Fe^(2+)` ions.

Discussion

14.	Assertion : When NaCl is added to water, a depression in freezing point is observed. Reason: The lowering of vapour pressure of a solution causes the depression in freezing point.
Answer» ASSERTION and REASON are correct and R is the correct explanation of A. Both A and R are correct R is not the correct explanation of A. A is correct but R is WRONG A is wrong but R is correct ANSWER :A

Discussion

15.	Assertion: When inductive and electromeric effects operate in oppsite directions, the inductive effect predominates. Reason: Inductive effect is the complete transfer of shared pair of pi electrons to one of the atoms.
Answer» If both assertion and reason are TRUE and reason is the CORRECT explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false. If both assertion and reason are false. Solution :When inductive and electromeric effects operate in OPPOSITE DIRECTIONS, the electronmeric effect predominates. inductive effect is the polarisation of `SIGMA` bond caused by the polarisation of adjancent `sigma` bond.

Discussion

16.	Assertion : When helium is allowed to expands into vacuum, heating effect is observed. Reason : The inversion temperature of helium is very low.
Answer» Both A and R are TRUE and R is the CORRECT explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Answer :A

Discussion

17.	Assertion :When CO_2 is continuously bubbled through lime water, a precipitationis formed which later dissolves Reason:Calcium carbonate is initially formed which reacts further with CO_2 to form calcium bicarbonate.
Answer» If both ASSERTION and Reason are correct and Reason is the Correct EXPLANATION of the Assertion. If both Assertion and Reason are Correct but Reason is not the Correct explanation of the Assertion. If Assertion is Correct but Reason is INCORRECT If Assertion is incorrect but Reason is Correct Answer :A

Discussion

18.	Assertion : When CaCO_(3) (s)isheated the loss of CO_(2)(g) from the system causes the reaction to go almost to completion to leava a residue of CaO (s) Reason : Heating causes gas particles to move with more energy.
Answer» if both assertion and REASON are correct and reason is CORRECTEXPLANATION for assertion. if both assertion and reason are correct but reason is not correct explanation for assertion. if assertion is correct but reason is incorrect. if assertion and reason boht are incorrect. Solution :Correct explanation . Loss of one of the PRODUCTS favours the FORWARD REACTIONS.

Discussion

19.	Assertion : When an iron rod is heated in a furnace, the radiation emitted goes from a lower frequency to a higher frequency as the temperature increases. Reason : The energy of a quantum of radiation is proportional to its frequency.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

20.	Assertion. When a real gas expandsadiabatically , the decrease in internal energy is equalto the adiabatic work done by the system. Reason. During adiabatic expansion,no heat entersor leaves the system.
Answer» If both A and R are TRUE,andR is the TRUEEXPLANATION of A. If both A and R are true,but R is not the true explanation of A. If A is true, but R is false If both A and R are false. Answer :a

Discussion

21.	Assertion: When a finely divided active carbon or clay is stirred into a dilute solution of a dye, the intensity of colour in the solution is decreased. Reason: the dye is adsorbed on the solid surface.
Answer» if both assertion and reason are true and the reason is the CORRECT explanation of the assertion. if both assertion and reson are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Solution :Both assertion and reason are true and reason is the correct explanation of assertion. The surface of a SOLID (or LIQUID) tends to attract and retain other MOLECULES when it is brought in contact with a gas or a solution.

Discussion

22.	Assertion : When 4 moles of H_2 reacts with 2 moles of O_2. Then 4 moles of water is formed. Reason : O_2 will act as limiting reagent.
Answer» Both assertion and REASON are true and reason is the CORRECT explanation of assertion. both assertion and reason are true but reason is not the correct explanation of assertion Only assertion is true but reason is false. Both assertion and reason are false. Answer :A::B::C::D

Discussion

23.	Assertion. When 1.0 mol of NaCl is doped with 10^(-3) mol SrCl_2, the number of cationic sites remaining vacant is 10^(-3) Reason. Each SrCl_2 unit produces two cation vacancies.
Answer» If both ASSERTION and REASON 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 A. As each `SrCl_2` unit CREATES one CATION vacancy , number of cation vacancies will be `10^(-3) "mol" =10^(-3) XX (6.02xx10^23) =6.02xx10^20` Correct R. Each `SrCl_2` produces one cation vacancy .

Discussion

24.	Assertion.When 1.0 mol of NaCl is doped with 10^(-3) "mol " SrCl^(2) . The number of cationic of cationic sites remaining vacant is 10^(-3) . Each SrCl_(2) unit produces two cation vacancies.
Answer» SOLUTION :Correct A. As each `SrCl_(2)` unit creates ONE CATION vacancy, number of cation vacancies will be ` 10^(-3) " MOL" = 10^(-3) xx ( 6.02 xx 10^(23)) = 6.02 xx 10^(20)` Correct R. Each `SrCl_(2)` produces one cation vacancy .

Discussion

25.	Assertion . Water is specially effective in screeniing the electrostatic interactions between the dissolved ions Reason . The electrostatic forces between two charged ions are inversely proportional to the dielectic constant of the solvent .
Answer» If both ASSERTION and reason are correct, and reason is the correct EXPLANATION of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is incorrect . If both assertion and reason are incorrect. Solution :Correct explanation . WATER the high DIELECTRIC constant

Discussion

26.	Assertion. Water is liquid state is more stable than ice at room temperature. Reason.Water in liquid form has higher entropy than ice.
Answer» If both A and R are TRUE,ANDR is the trueexplanation of A. If both A and R are true,but R is not the true EXPLANATION of A. If A is true, but R is false If both A and R are false. Answer :a

Discussion

27.	Assertion : Viscosity of liquids decreases as the temperature rises .Reason : At high temperature , molecules have high kinetic energy and can overcome the intermolecular forces to flow faster .
Answer» If both ASSERTION and reason are TRUE and reason is the CORRECT explanation of assertion . If both assertion and reason are true but reason is NOTTHE correct explanation of assertion . If assertion is true but reason is false . If both assertion and reason are false . Answer :A

Discussion

28.	Assertion. Viscosity of liquid decreases on increasing the temperature. Reason. Evaporation of a liquid increases with rise in temperature.
Answer» SOLUTION :Correct explanation. With increase of TEMPERATURE, the kinetic energy or motion of the MOLECULES increases and hence INTERMOLECULAR force of attraction DECREASE.

Discussion

29.	Assertion: Viscosity of a liquid decreases on increasing the temperature. ltBrgt Reason: Evaporation of liquid increases with rise in temperature.
Answer» if both ASSERTION and reason are TRUE and the reason is the correct explanation of the assertion. if both assertion and reson are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Solution :The correct reason is that molecules of liquid absorb heat energy thus their kinetic energy or MOTION INCREASES.

Discussion

30.	Assertion : Vapour density is the same thing as density. Reason : Molecular weight is twice density.
Answer» If both assertion and Reason 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 assertion. VAPOUR density and density are DIFFERENT things. Correct reason. MOLECULAR WEIGHT is TWICE vapour density.

Discussion

31.	Assertion : Twonodal planes are present in 3d_(xy).Reason : Number of nodal planes = 1
Answer» If both Assertion & Reason are true and the reason is the CORRECT explanation of the assertion. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. If Assertion is true STATEMENT but Reason is false. If both Assertion and Reason are false statements. ANSWER :A

Discussion

32.	Assertion : Two electrons in an atom can have the same values of four quantum numbers. Reason : Two electrons in an atom can be present in the same shell, sub-shell and orbital and have the same spin.
Answer» If both ASSERTION and reason are true and the reason is the CORRECT explanation of the assertion If both assertion and reason are true butreason isnot the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :We know from the Pauli exclusion principle, that two electrons in the same atom can not have same VALUE of all four quantum numbers. This means each electron in an atom has only ONE set of values of n,l,m and s. Therefore both the Assertion and Reason are false.

Discussion

33.	Assertion : Two mole of glucose contains 12.044 xx 10^(23) molecules of glucose. Reason : Total number of entities present in one mole of any substance is equal to 6.022xx10^(22)
Answer» both ASSERTION and reason are true and the reason is the correct explanation of assertion both assertion and reason are true but reason is not the correct explanation of assertion assertion is true but reason is false both assertion and reason are false Solution :Correct reason: Total number of entities PRESENT in one mole of any substance is equal to `6.022 xx10^(23)`

Discussion

34.	Assertion Tungsten has a very high melting point. Reason(R)Tungsten is a covalent compound.
Answer» Both A and R are true and R is THECORRECT EXPLANATION of A Both A ANDR are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :C

Discussion

35.	Assertion. Triclinic system is the most unsymmetrical system Reason. No axial angle is equal to 90^@ in triclinic system
Answer» If both ASSERTION and REASON 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 explanation . Axial angles are not EQUAL to each other.

Discussion

36.	Assertion . Triclinic system is the most unsymmetrical system. Reason. No axial angle is equal to90^(@) in triclinic system.
Answer» SOLUTION :Correct EXPLANATION. Axial ANGLES are not equal to each other.

Discussion

37.	Assertion: Total number of orbitals associated with principal quantum number n=3 is 6. Reason : Number of orbitals in a shell equals to 2n.
Answer» If both assertion and reason are TRUE and the reason is the correct EXPLANATION of the assertion If both assertion and reason are true butreason ISNOT the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Both assertion and reason are false. Total number of orbitals associated with Principal quantum number n=3 is 9.one 3S orbital + three 3p orbital + five 3d orbitals. `therefore` Therefore there are a total number of nine orbitals. Number of orbitals in a shell equals to `n^2`.

Discussion

38.	Assertion : Total number of octahedral voids present in unit cell of cubic close packing including the one that is rpesnt at the body centre, is four. Reason :Besides the body centre, there is one cothedral void present at the centre of each of the six faces of the unit cells and each of which is shared between two adjacent unit cells.
Answer» ASSERTION and REASON both are corrct statements and reason is correct explanation for assertion. Assertion and reson both are correct statements but reason is not correct explanation for ASSERATION . Assertion is correct statement but reason is wrong statement . Assertion is wrong statement but reason is correct statement . SOLUTION :Correct Reason . Besides the body centre, there are 12 octahedral voids present at the centres of the

Discussion

39.	Assertion : To separate U-235 from the more abundant U-238 isotope, all the uranium is converted into UF_(6) Reason : UF_(6) is one of the new compounds that exists in gaseous state under ordinary conditions
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Answer :A

Discussion

40.	Assertion: Total number of octahedralvoids present in unit cell of cubic close packing including the one that is present at the body centre, is four . Reason: Besides the body centre, there is one octahedral void present at the centre of each of the six faces of the unit cells and each of which is shared between two adjacent unit cells.
Answer» Assertion and REASON both are correct STATEMENTS and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion Assertion is correct statement but reason is wrong statement Assertion is wrong statement but reason is correct statement. Solution :Correct Reason.Besides the body centre, there are 12 OCTAHEDRAL voids present at the CENTRES of the 12 edges

Discussion

41.	Assertion : Thorium, uranium and actinium series are designated as 4n, 4n+2 and 4n+3 series respectively. Reason : The mass number of all elements in the thorium series are divided by 4 gives a remainder of 2 while those of actinium series gives a remainder of 3 when the mass number is divided by 4.
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

42.	Assertion : Third law of thermodynamics is confined to pure crystalline solids. Reason : Theoretical arguments and practical evidences have shown that entropy of solutions and supar cooled liquids is not zero at 0 K.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

43.	Assertion : Thomson's atomic model is known as 'raisin pudding' model. Reason: The atom is visualized as a pudding of positive charge with electrons (raisins ) embedded in it.
Answer» If both ASSERTION and REASON are true and the reason is the CORRECT EXPLANATION of the assertion If both assertion and reason are true butreason ISNOT the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Both assertion and reasonare true and reason is the correct explanation of assertion

Discussion

44.	How many Significant figures in each term?a.34.6209b.0.003048
Answer» ANSWER :A

Discussion

45.	Assertion. The water pouch of instant cold pack for treating athletic injury breaks injury breaks when squeezed and NH_(4)NO_(3) dissolved lowers the temperature. Reason. Additon of non-volatile solute into solvent resultsinto the depression of freezing point of the solvent.
Answer» If both A and R are true,andR is the trueexplanation of A. If both A and R are true,but R is not the true EXPLANATION of A. If A is true, but R is false If both A and R are false. Answer :b

Discussion

46.	Assertion. The water gas shift reaction can be used to increase the amount of H_(2) in the syngas mixture . Reason. In this reaction, CO reduces stream to H_(2).
Answer» ANSWER :A

Discussion

47.	Assertion. The value of van der Waals constant 'a' for ammonia is larger that that of nitrogen gas. Reason. Molecular weight of ammonia is smaller that that of nitrogen gas.
Answer» Solution :Correct explanation. The intermolecular FORCES of attraction are GREATER in `NH_(3)` than those in `N_(2)`.

Discussion

48.	Assertion : The use of hot air balloons in sports and formeterological observations is an application of Charle's law Reason : Hot air is less and hence gases expand on heating
Answer» Both A and R are true and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

49.	Assertion : The transfer of electrons from zinc to copper takes place through metal wire connecting the two rods. Reason : Electricity from solution in one beaker to other flows by migration of ions through the salt bridge.
Answer» If both assertion and REASON are TRUE and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :B

Discussion

50.	Assertion :The total number of atoms present in a simle cubic unit cell is one. Reason : Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.
Answer» Assertion and reason both are CORRCT STATEMENTS and reason is correct explanation for assertion. Assertion and RESON both are correct statements but reason is not correct explanation for asseration . Assertion is correct STATEMENT but reason is wrong statement . Assertion is wrong statement but reason is correct statement . Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion(A): Lactic acid is optically active compound Reason (R): It contains a chiral centre with plane of symmetry

Statement I : Combustion of all organic compounds is exothermic in nature. Statement II : The enthalpies of all elements in their standard states are zero.

Assertion: ZSM-5 is used as a catalyst in petrochemical industries. Reason: Zeolites are three dimensional network Silicates in which some silicon atoms are replaced by aluminium atoms.

Assertion. Zinc blende and wurtzite both have fcc arrangement of sulphide ions. Reason. A unit cell of both has four formula units of ZnS

Assertion : Zinc diplaces copper from copper suphate solution Reason: The E^(@) of Zn is- 0.76 V and that of Cu is +0.34 V.

Assertion. Zinc blende and wurtzite both have fcc arrangement of sulphide ions. Reason.A unit cell of bothhas four formula units of ZnS.

Assertion : Zeolites are the three-dimensional network silicates. Reason : Negative charge on zeolite structure is neutralised by positively charged AI^(3+) ions.

Assertion: Wurtz reaction is not preferred for the preparation of alkanes containing odd number of carbon atoms. Reason: It is not possible to prepare alkanes with odd number of carbon atoms through wurtz reaction.

Assertion: Wolframite impurity is separated from tin stone (SnO_(2)) by magnetic separation. Reason: Tin stone is ferromagnetic and is attracted by the magnet.

Assertion : Windowpanes of old building become thicker at the bottom than at the top .Reason : Glass is an extremely viscous liquid .

Assertion . When two hydrogen atoms approach each other to form a cavalent bond , nearly435.8 KJ mol^(-1) of energy is released . Reason .When two atoms approach eachother to form a covalent bond between them, potential energy of the system is released .

Assertion : When sodium hydride in fused state is electrolysed, hydrogen is dicharged at anode. Reason : Sodium hydride is an electrovalent compound in which hydrogen is present as cation.

Assertion. When NO reacts with FeSO_(4) a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is 6.

Assertion : When NaCl is added to water, a depression in freezing point is observed. Reason: The lowering of vapour pressure of a solution causes the depression in freezing point.

Assertion: When inductive and electromeric effects operate in oppsite directions, the inductive effect predominates. Reason: Inductive effect is the complete transfer of shared pair of pi electrons to one of the atoms.

Assertion : When helium is allowed to expands into vacuum, heating effect is observed. Reason : The inversion temperature of helium is very low.

Assertion :When CO_2 is continuously bubbled through lime water, a precipitationis formed which later dissolves Reason:Calcium carbonate is initially formed which reacts further with CO_2 to form calcium bicarbonate.

Assertion : When CaCO_(3) (s)isheated the loss of CO_(2)(g) from the system causes the reaction to go almost to completion to leava a residue of CaO (s) Reason : Heating causes gas particles to move with more energy.

Assertion : When an iron rod is heated in a furnace, the radiation emitted goes from a lower frequency to a higher frequency as the temperature increases. Reason : The energy of a quantum of radiation is proportional to its frequency.

Assertion. When a real gas expandsadiabatically , the decrease in internal energy is equalto the adiabatic work done by the system. Reason. During adiabatic expansion,no heat entersor leaves the system.

Assertion: When a finely divided active carbon or clay is stirred into a dilute solution of a dye, the intensity of colour in the solution is decreased. Reason: the dye is adsorbed on the solid surface.

Assertion : When 4 moles of H_2 reacts with 2 moles of O_2. Then 4 moles of water is formed. Reason : O_2 will act as limiting reagent.

Assertion. When 1.0 mol of NaCl is doped with 10^(-3) mol SrCl_2, the number of cationic sites remaining vacant is 10^(-3) Reason. Each SrCl_2 unit produces two cation vacancies.

Assertion.When 1.0 mol of NaCl is doped with 10^(-3) "mol " SrCl^(2) . The number of cationic of cationic sites remaining vacant is 10^(-3) . Each SrCl_(2) unit produces two cation vacancies.

Assertion . Water is specially effective in screeniing the electrostatic interactions between the dissolved ions Reason . The electrostatic forces between two charged ions are inversely proportional to the dielectic constant of the solvent .

Assertion. Water is liquid state is more stable than ice at room temperature. Reason.Water in liquid form has higher entropy than ice.

Assertion : Viscosity of liquids decreases as the temperature rises .Reason : At high temperature , molecules have high kinetic energy and can overcome the intermolecular forces to flow faster .

Assertion. Viscosity of liquid decreases on increasing the temperature. Reason. Evaporation of a liquid increases with rise in temperature.

Assertion: Viscosity of a liquid decreases on increasing the temperature. ltBrgt Reason: Evaporation of liquid increases with rise in temperature.

Assertion : Vapour density is the same thing as density. Reason : Molecular weight is twice density.

Assertion : Twonodal planes are present in 3d_(xy).Reason : Number of nodal planes = 1

Assertion : Two electrons in an atom can have the same values of four quantum numbers. Reason : Two electrons in an atom can be present in the same shell, sub-shell and orbital and have the same spin.

Assertion : Two mole of glucose contains 12.044 xx 10^(23) molecules of glucose. Reason : Total number of entities present in one mole of any substance is equal to 6.022xx10^(22)

Assertion Tungsten has a very high melting point. Reason(R)Tungsten is a covalent compound.

Assertion. Triclinic system is the most unsymmetrical system Reason. No axial angle is equal to 90^@ in triclinic system

Assertion . Triclinic system is the most unsymmetrical system. Reason. No axial angle is equal to90^(@) in triclinic system.

Assertion: Total number of orbitals associated with principal quantum number n=3 is 6. Reason : Number of orbitals in a shell equals to 2n.

Assertion : To separate U-235 from the more abundant U-238 isotope, all the uranium is converted into UF_(6) Reason : UF_(6) is one of the new compounds that exists in gaseous state under ordinary conditions

Assertion : Third law of thermodynamics is confined to pure crystalline solids. Reason : Theoretical arguments and practical evidences have shown that entropy of solutions and supar cooled liquids is not zero at 0 K.

Assertion : Thomson's atomic model is known as 'raisin pudding' model. Reason: The atom is visualized as a pudding of positive charge with electrons (raisins ) embedded in it.

How many Significant figures in each term?a.34.6209b.0.003048

Assertion. The water pouch of instant cold pack for treating athletic injury breaks injury breaks when squeezed and NH_(4)NO_(3) dissolved lowers the temperature. Reason. Additon of non-volatile solute into solvent resultsinto the depression of freezing point of the solvent.

Assertion. The water gas shift reaction can be used to increase the amount of H_(2) in the syngas mixture . Reason. In this reaction, CO reduces stream to H_(2).

Assertion. The value of van der Waals constant 'a' for ammonia is larger that that of nitrogen gas. Reason. Molecular weight of ammonia is smaller that that of nitrogen gas.

Assertion : The use of hot air balloons in sports and formeterological observations is an application of Charle's law Reason : Hot air is less and hence gases expand on heating

Assertion : The transfer of electrons from zinc to copper takes place through metal wire connecting the two rods. Reason : Electricity from solution in one beaker to other flows by migration of ions through the salt bridge.

Assertion :The total number of atoms present in a simle cubic unit cell is one. Reason : Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.