52671 + Interview Questions in Chemistry in Class 11

1.	Assertion. Graphite is an example of tetragonal crystal system. Reason . For a tetragonal system, a = b ne c, alpha = beta= 90^@, gamma =120^@
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. Graphite is an example of hexagonal crystal system (Each C-atom is `sp^2`-hybridized and is linked to three other C-atoms in a hexagonal planar STRUCTURE. Correct R. For a TETRAGONAL system, `a=b ne c, alpha = beta = gamma=90^@`. For a hexagonal system `a= b ne c, alpha = beta =90^@ , gamma =120^@`

Discussion

2.	Assertion :Graphite is a good conductor of electricity , however diamond belongs to the category of insulators. Reason: Graphite is soft in nature, on the other hand diamond is very hard and brittle
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 explanation. In GRAPHITE, each carbon atom is linked to THREE other ATOMS in layers and the fourth electron is free to move . Diamond is covalent network solid in which each carbon atom is linked to four other carbon atoms.

Discussion

3.	Assertion : Graphite is a good conductor of electricity, however diamond belongs to the category of insulators. Reason : Graphite is soft in nature, on the other hand diamond is very hard and brittle
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 explanation. In graphite, each carbon ATOMS is linked to three OTHE carbon atoms in layers and the FOURTH electron is FREE to move. Diamond is a covalent network solid in which each carbon atom is linked to four other carbon atoms.

Discussion

4.	Assertion. Graphite is a good conductkorof heat and electricity. Reason. Graphitehas all the electronsfirmly held in C-C, sigma-bonds.
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 not is the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct reason. Eachcarbon in GRAPHITEHAS one FREE electron which makes graphites a good CONDUCTOR of electricity.

Discussion

5.	Assertion: Glycerol is purified by distillation under reduced pressure. Reason: Method of distillation under reduced pressure is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.
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

6.	Assertion: Generally alkali and alkaline earth metals form superoxides. Reason: There is a single bond between O and O in superoxides.
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 assertion is true but reason is false both assetion and reason are false Solution :AMONG alkali and alkaline earth metals, K, Rb and Cs ALONE forms superoxides. SUPEROXIDE `O_(2)` has 3 ELECTRON bond.

Discussion

7.	Assertion :Generally alkali and alkaline earth metals form superoxides Reason : There is a single bond between O and O in superoxides.
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 assertion is true but reason is false both assertion and reason are false Answer :D

Discussion

8.	Assertion : Generally alkali and alkaline earth metals form superoxides Reason : There is a single bond between O and O in superoxides.
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 assertion is true but reason is FALSE both assertion and reason are false Solution :both assertion and reason are false

Discussion

9.	Assertion : Gases become denser at high pressure .Reason : At high pressures , gases deviate from Boyle's law .
Answer» <P>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 :When a GIVEN mass of a gas is compressed, the same number of molecules occupy a smaller space. Hence, gases become denser at high pressure. ALSO, `d=((m)/(k_(1)))P=k'P ""["from Boyle's law " V = k_(1)(1)/(P)]`

Discussion

10.	Assertion : Gases do not liquefy above their critical temperature even on applying high pressure. Reason : Above critical temperature, the molecular speed is high and intermolecular attractions can not hold the molecules together because the escape because of high speed.
Answer» A and R both are CORRECT, and R is correct EXPLANATION of A. A and R both are correct, but R is not correct explanation of A. A is TRUE but R is FALSE. A is false but R is true. Answer :A

Discussion

11.	Assertion : Gas constant R = lite atmosphere "deg"^(-1) mol^(-1) Reason : Total pressure of a mixture of non-reacting gases = sum of the partial pressures of all the component gases of the mixture
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 :B

Discussion

12.	Assertion. Friedel-Crafts reaction is used to introduce an alkyl or acyl group in benzene nucleus Reason. Benzene is a solvent for the Friedel-Crafts alkylation of bromobenzene
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 reason. SINCE benzene is more reactive than bromobenzene, therefore , F.C. reaction will occur preferentially in benzene rather than in bromobenzene and hence benzene cannot be USED as a SOLVENT in this reaction.

Discussion

13.	Assertion. Friedel-Crafts reaction of benzene with n- propyl chloride on heating gives isopropylbenzene. Reason. Benzene undergoes electrophilic substitution readily.
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. The INITIALLY formed n-propyl cation first undergoes rearrangment by 1,2-hybride shift to form the more STABLE isopropyl cation which then attacks the BENZENE ring to form isopropylbenzene.

Discussion

14.	Assertion. Frenkel defects are shown by silver halides. Reason. Ag^+ ions have small size.
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 :R is CORRECT explanation of A

Discussion

15.	Assertion. Frenkel defects are shown by silver halides. Reason.Ag^(+) ions have small size.
Answer» SOLUTION :R is the CORRECT EXPLANATION of A.

Discussion

16.	Assertion : Formic acid reacts with Fehling solution Reason : It has a carboxylic acid group
Answer» Both A and R are true 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 :B

Discussion

17.	Assertion. ForCO_(2) , the ratio of the molar heat capacities ( C_(p) //C_(v)) is 1.40. Reason . For CO_(2) , C_(v) = (5)/(2) R and C_(p) = ( 7)/( 2) R
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 :d

Discussion

18.	Assertion. For the reaction ,2 NH_(3)(g) rarr N_(2)(g) + 3H_(2)(g) , DeltaHgt DeltaE Reason . Enthalpy change is always greater than internal energy change.
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 :c

Discussion

19.	Assertion For the daniell cell Zn\|Zn^(2+)\|\|Cu^(2+)\|Cu with E_(cell) =1.1 V the application of opposite potentialgreater than 1.1 V result in ot flow of electron from cathode to anode Reason Zn is deposited at anode and Cu is dissolved at cathode
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 ANSWER :a

Discussion

20.	Assertion. For greenhouse effect, presence of green plants is essential Reason. Chlorophyll of the green plants causes greenhouse effect.
Answer» If both Assertion and REASON are true and Reason is the correct EXPLANATION of Assertion. Both Assertion and Reason are true but Reasonis not the correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Solution :Correct A. Greenhouse effect is due to presence `CO_2` and water vapour near the earth's SURFACE. Correct Reason. `CO_2` and `H_2O` vapour present near the earth's surface cause greenhouse effect.

Discussion

21.	Assertion : For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristicproperty. (R) : Equilibrium constant is independent of temperature.
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. Assertion is true but Reason is false. Both Assertion and Reason are false. Solution :Assertion is true but reason is false. Equilibrium CONSTANT of a reaction depends UPON temperature.

Discussion

22.	Assertion. For a certain fixed amount of gas, the product PV is always constant. Reason. Real gases have higher pressure and lower volume than ideal gases and hence product PV is constant.
Answer» Solution :CORRECT A. Product PV is CONSTANT only for ideal gases at constant TEMPERATURE. Correct R. REAL gases have lower pressure for ideal gases at constant temperature.

Discussion

23.	Assertion : Fluorine has an oxidation state of -1 in all its compounds. Reason : Fluorine is the most electronegative element of the periodic table.
Answer» Both assertion and reason are correct and reason is the correct explanation for assertion . Both assertion and reason are correct but reason is not the correct explanation for assertion . Assertion is TRUE but reason are FALSE. Both assertion and reason are false. Answer :A::B::C::D

Discussion

24.	Assertion Fe_(3)O_(4) contains iron atoms intwo different oxidation number Reason Fe^(2+) ions decoloruize KMnO_(4) solution
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 explanation The composition of `Fe_(3)O_(4)` is `FeOFe_(2)O_(3)` having iron in +2 and +3 oxidation states respeectively `FE^(2+)` ion present in FeO being a REDUCING agent decolourise `KMnO_(4)` solution

Discussion

25.	Assertion Fe rects with HCI produce H_(2) gas Reason Fe isbetterreducing agent than H_(2)
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 ANSWER :a

Discussion

26.	Assertion F_(2) does not undrego disporportionation reaction ReasonFluorine shows only 0 and -1 oxidation states
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 assertion `F_(2)` undergoes disproption nation reaction `F_(2)+H_(2)O("ice")rarrHF+HOF` correct reason `F_(2)` gets reduced to HF and oxidised to HOF

Discussion

27.	Assertion: F-F bond in F_2 is stronger than Cl-Cl bond in Cl_2 Reason: F atom is small in size than.
Answer» Both A and B TRUE and R is the CORRECT EXPLANATION 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 :D

Discussion

28.	Assertion: F atom has lower electron affinity than Cl atom. Reason: Additional electrons are reflected more effectively by 3p-electrons in Cl than 2p-electron in F atom.
Answer» Both A and B TRUE and R is the correct EXPLANATION 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 :C

Discussion

29.	Assertion: Ethyne reacts with sodium metal and sodamide to form sodium acetylide with the liberation of dihydrogen gas. Reason: Alkynes are highly unsaturated.
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 :Hydrogen atoms in ethyne `(HC-=CH)` are attached to the sp hybridised CARBON atoms which is more electronegative. THUS, hydrogen atom can be liberated as proton more easily and ethyne behaves as an acid.

Discussion

30.	Assertion : Essential oils are purified by steam distillation. Reason : Essential oils are volatile and are insoluble in water.
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 Answer :A

Discussion

31.	Assertion: Equivalent mass of ozone in the change O_(3) rarr O_(2) is 8. Reason: 1 moles of O_(3) on decomposition gives 3//2 mole of O_(2).
Answer» (a)If both assertion and reason are true and the reason is the CORRECT EXPLANATION of the assertion. (b)If both assertion and reason are true and the reason is not the correct explanation of the assertion. (c )If assertion is true but reason is FALSE. (d)If assertion is false but reason is true. Solution :`2O_(3) rarr 3O_(2), 2 "mole" O_(3) -= 3 "moles" O_(2)=3xx4 eq. O_(2)` `:. E_(O_(3))=M/6=48/6=8 EO`.

Discussion

32.	Assertion :Equivalent mass of KMnO_(4) is equal to one-fifth of its molecular mass when it acts as an oxidising agent in acidic medium. Reason : Oxidation number of Mn in KMnO_(4) is +7.
Answer» If both ASSERTION and REASON are CORRECT, and Reason is the correct EXPLANATION of Assertion. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. If Assertion is correct, but Reason is INCORRECT. If Assertion is incorrect, but Reason is correct. Solution :N//A

Discussion

33.	Assertion : Equal volumes of all the gases do not contain equal number of atoms. Reason : Atom is the smallest particle which takes part in chemical reactions.
Answer» Both ASSERTION and reason are correct and reason is the correct explanation for assertion . Both assertion and reason are correct but reason is not the correct explanation for assertion . Assertion is TRUE but reason are FALSE. Both assertion and reason are false. Answer :A::B::C::D

Discussion

34.	Assertion : Enthalpy of neutralisation of 1 equivalent each of HCl and H_(2)SO_(4) with NaOH is same Reason : Enthalpy of neutralisation is always the heat evolved when 1 mole acid is neutralised by a base.
Answer» Both assertion and REASON are true and reason is the correct EXPLANATION of the assertion Both assertion and reason are true and reason is not the correct explanation of the assertion Assertion is true but reason are FALSE Both assertion and reason are false. Answer :C

Discussion

35.	Assertion . Enthalpyof graphite is lowr than that of diamond. Reason.Entropy of graphite is greater than that of diamond.
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

36.	Assertion: Energy of the orbitals increases as 1s lt 2s = 2p lt 3s = 3p lt 3d lt 4s =4p =4d =4f lt …… in a hydrogen atom. Reason:Energy of the electron depends completely on principal quantum number.
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 :Assertion is true but reason is false. The order 1s lt 2s =2p lt 3s = 3p = 3d lt …. Is true for the energy of an electron in a hydrogen atom and is solely determined by Principal quantum NUMBER. For multielectron system energy also DEPENDS on azimuthal quantum number. The stability of an electron in a multi-electron atom is the net result of the ATTRACTION between the electron and the nucleus and the repulsion between the electron and the rest of the electron PRESENT . Energies of different subshell (azimuthal quantum number) present within the same principal shell are found to be in order of s lt p lt d lt f

Discussion

37.	Assertion: Elements of p-block always form coloured ions in the aqueous solution. Reason: p-block elements are also called transfermium elements
Answer» Both A and B TRUE and R is the correct EXPLANATION A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE Both A and R are false ANSWER :D

Discussion

38.	Assertion: Elements O, N and Ar are called atmophiles Reason: Atoms in Greek means which cannot be subdivided.
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 :Elements O, N and Ar are CALLED atmophile because atoms is GREEK means vapour.

Discussion

39.	Assertion: Elements Fe, Ni, Co, Pd and Rb are called siderophiles. Reason: Sideros in Greek means iron.
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 :Both ASSERTION A and R are true and R is the correct explanation of A.

Discussion

40.	Assertion:Elements and compound are the examples of pure substances. Reason : The properties of a compound are different from those of its constituent elements.
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 correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :An element consists of only one type of particles (i.e., atoms or molecules). In a compound, the atoms of different elements are present in a fixed and definite ratio and the constituents of a compound can be separated by chemical methods.

Discussion

41.	Assertion : Elements like Rb, Cs, Tl, In, Ga and Sc were discovered when their minerals were analysed by spectroscopic methods. Reason : The characteristiclines in atomic spectra can be used in chemical analysis to identify unknown 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. Answer :A

Discussion

42.	Assertion. Elementary phosphorus exists I three principal allotrpic forms, i.e., white (yellow), red (or violte) and black. Reason. Of the three forms, white phosphorus is the most important and most reactive.
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. Depending upon whether `P_(4)` MOLECULES exist as discrete molecules held together by weak van der waals forces or are covalently bonded with one ANOTHER to form polymeric structures, phosphorus exists in three allotropic forms.

Discussion

43.	Assertion. Electronic configurations of Cr^(3+) (containing 21 electrons) is same as that of Sc (Z = 21), i.e., isoelectronic species have the same electronic configuration Reason. Orbitals of atoms as well as ions are filled in order of increasing energy following aufbau principle
Answer» If both ASSERTION and reason are true, and reason is the true explanation of the arrertion If both assertion and reason are true, but reason is not the true explanation of the assertional If assertion is true, but reason is false If both assertion and reason are false Solution :Correct A. Atomic and cations containing the same number of electrons do not have the same electronic configuration Correct R. Orbitals of ATOMS are filled in order of increasing energy.

Discussion

44.	Assertion: Electron affinity of oxygen is less than that offluorine but greater than that of nitrogen. Reason: Ionisation potential decreasses as N gt O gt F.
Answer» Both A and B TRUE and R is the correct explanation 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 :C

Discussion

45.	Assertion. Electrolysis of molten CaH_(2) produces hydrogen gas at anode. Reason. In CaH_(2) hydrogen is present in the form of hydride H^(-).
Answer» ANSWER :A

Discussion

46.	Assertion. Effusion rate of oxygen is smaller than nitrogen. Reason. Molecular size of nitrogen is smaller than oxygen.
Answer» Solution :Correct R. MOLECULAR SIZE DECREASES from left to right along a PERIOD. Thus, molecular size of nitrogen is greater than that of oxygen.

Discussion

47.	Assertion: EA_1 of fluorine is less than that of chlorine. Reason: Additional electrons are repelled more effectively by 3p electrons in Cl atoms than by 2p electrons in F atom than Cl.
Answer» Both A and B true and R is the CORRECT explanation 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 :C

Discussion

48.	Assertion : During test for nitrogen with Lassaigne's extract on adding FeCl_(3) solution, sometimes a red precipitate is obtained. Reason : Sulphur is also present.
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 Answer :A

Discussion

49.	Assertion : Displacement reactions ofchlorine, bromine and iodine using fluorine are not generally carried out in aqueous solution. Reason : Fluorine being highly reactive attacks water and displaces the oxygen of water.
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

50.	Assertion : Dipole - dipole forces acting between the molecules possessing permanent dipole , are weaker than ion - ion interactions .Reason : The attractive forces decrease with the increase of distance between the dipoles .
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 :Ends of the dipoles possess 'partial charges' which are ALWAYS less than the UNIT ELECTRONIC charge `(1.6xx10^(-19)C)` present in ions. Thus, dipole-dipole forces are weaker than ion-ion interactions.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion. Graphite is an example of tetragonal crystal system. Reason . For a tetragonal system, a = b ne c, alpha = beta= 90^@, gamma =120^@

Assertion :Graphite is a good conductor of electricity , however diamond belongs to the category of insulators. Reason: Graphite is soft in nature, on the other hand diamond is very hard and brittle

Assertion : Graphite is a good conductor of electricity, however diamond belongs to the category of insulators. Reason : Graphite is soft in nature, on the other hand diamond is very hard and brittle

Assertion. Graphite is a good conductkorof heat and electricity. Reason. Graphitehas all the electronsfirmly held in C-C, sigma-bonds.

Assertion: Glycerol is purified by distillation under reduced pressure. Reason: Method of distillation under reduced pressure is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.

Assertion: Generally alkali and alkaline earth metals form superoxides. Reason: There is a single bond between O and O in superoxides.

Assertion :Generally alkali and alkaline earth metals form superoxides Reason : There is a single bond between O and O in superoxides.

Assertion : Generally alkali and alkaline earth metals form superoxides Reason : There is a single bond between O and O in superoxides.

Assertion : Gases become denser at high pressure .Reason : At high pressures , gases deviate from Boyle's law .

Assertion : Gases do not liquefy above their critical temperature even on applying high pressure. Reason : Above critical temperature, the molecular speed is high and intermolecular attractions can not hold the molecules together because the escape because of high speed.

Assertion : Gas constant R = lite atmosphere "deg"^(-1) mol^(-1) Reason : Total pressure of a mixture of non-reacting gases = sum of the partial pressures of all the component gases of the mixture

Assertion. Friedel-Crafts reaction is used to introduce an alkyl or acyl group in benzene nucleus Reason. Benzene is a solvent for the Friedel-Crafts alkylation of bromobenzene

Assertion. Friedel-Crafts reaction of benzene with n- propyl chloride on heating gives isopropylbenzene. Reason. Benzene undergoes electrophilic substitution readily.

Assertion. Frenkel defects are shown by silver halides. Reason. Ag^+ ions have small size.

Assertion. Frenkel defects are shown by silver halides. Reason.Ag^(+) ions have small size.

Assertion : Formic acid reacts with Fehling solution Reason : It has a carboxylic acid group

Assertion. ForCO_(2) , the ratio of the molar heat capacities ( C_(p) //C_(v)) is 1.40. Reason . For CO_(2) , C_(v) = (5)/(2) R and C_(p) = ( 7)/( 2) R

Assertion. For the reaction ,2 NH_(3)(g) rarr N_(2)(g) + 3H_(2)(g) , DeltaHgt DeltaE Reason . Enthalpy change is always greater than internal energy change.

Assertion For the daniell cell Zn|Zn^(2+)||Cu^(2+)|Cu with E_(cell) =1.1 V the application of opposite potentialgreater than 1.1 V result in ot flow of electron from cathode to anode Reason Zn is deposited at anode and Cu is dissolved at cathode

Assertion. For greenhouse effect, presence of green plants is essential Reason. Chlorophyll of the green plants causes greenhouse effect.

Assertion : For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristicproperty. (R) : Equilibrium constant is independent of temperature.

Assertion. For a certain fixed amount of gas, the product PV is always constant. Reason. Real gases have higher pressure and lower volume than ideal gases and hence product PV is constant.

Assertion : Fluorine has an oxidation state of -1 in all its compounds. Reason : Fluorine is the most electronegative element of the periodic table.

Assertion Fe_(3)O_(4) contains iron atoms intwo different oxidation number Reason Fe^(2+) ions decoloruize KMnO_(4) solution

Assertion Fe rects with HCI produce H_(2) gas Reason Fe isbetterreducing agent than H_(2)

Assertion F_(2) does not undrego disporportionation reaction ReasonFluorine shows only 0 and -1 oxidation states

Assertion: F-F bond in F_2 is stronger than Cl-Cl bond in Cl_2 Reason: F atom is small in size than.

Assertion: F atom has lower electron affinity than Cl atom. Reason: Additional electrons are reflected more effectively by 3p-electrons in Cl than 2p-electron in F atom.

Assertion: Ethyne reacts with sodium metal and sodamide to form sodium acetylide with the liberation of dihydrogen gas. Reason: Alkynes are highly unsaturated.

Assertion : Essential oils are purified by steam distillation. Reason : Essential oils are volatile and are insoluble in water.

Assertion: Equivalent mass of ozone in the change O_(3) rarr O_(2) is 8. Reason: 1 moles of O_(3) on decomposition gives 3//2 mole of O_(2).

Assertion :Equivalent mass of KMnO_(4) is equal to one-fifth of its molecular mass when it acts as an oxidising agent in acidic medium. Reason : Oxidation number of Mn in KMnO_(4) is +7.

Assertion : Equal volumes of all the gases do not contain equal number of atoms. Reason : Atom is the smallest particle which takes part in chemical reactions.

Assertion : Enthalpy of neutralisation of 1 equivalent each of HCl and H_(2)SO_(4) with NaOH is same Reason : Enthalpy of neutralisation is always the heat evolved when 1 mole acid is neutralised by a base.

Assertion . Enthalpyof graphite is lowr than that of diamond. Reason.Entropy of graphite is greater than that of diamond.

Assertion: Energy of the orbitals increases as 1s lt 2s = 2p lt 3s = 3p lt 3d lt 4s =4p =4d =4f lt …… in a hydrogen atom. Reason:Energy of the electron depends completely on principal quantum number.

Assertion: Elements of p-block always form coloured ions in the aqueous solution. Reason: p-block elements are also called transfermium elements

Assertion: Elements O, N and Ar are called atmophiles Reason: Atoms in Greek means which cannot be subdivided.

Assertion: Elements Fe, Ni, Co, Pd and Rb are called siderophiles. Reason: Sideros in Greek means iron.

Assertion:Elements and compound are the examples of pure substances. Reason : The properties of a compound are different from those of its constituent elements.

Assertion : Elements like Rb, Cs, Tl, In, Ga and Sc were discovered when their minerals were analysed by spectroscopic methods. Reason : The characteristiclines in atomic spectra can be used in chemical analysis to identify unknown atoms.

Assertion. Elementary phosphorus exists I three principal allotrpic forms, i.e., white (yellow), red (or violte) and black. Reason. Of the three forms, white phosphorus is the most important and most reactive.

Assertion. Electronic configurations of Cr^(3+) (containing 21 electrons) is same as that of Sc (Z = 21), i.e., isoelectronic species have the same electronic configuration Reason. Orbitals of atoms as well as ions are filled in order of increasing energy following aufbau principle

Assertion: Electron affinity of oxygen is less than that offluorine but greater than that of nitrogen. Reason: Ionisation potential decreasses as N gt O gt F.

Assertion. Electrolysis of molten CaH_(2) produces hydrogen gas at anode. Reason. In CaH_(2) hydrogen is present in the form of hydride H^(-).

Assertion. Effusion rate of oxygen is smaller than nitrogen. Reason. Molecular size of nitrogen is smaller than oxygen.

Assertion: EA_1 of fluorine is less than that of chlorine. Reason: Additional electrons are repelled more effectively by 3p electrons in Cl atoms than by 2p electrons in F atom than Cl.

Assertion : During test for nitrogen with Lassaigne's extract on adding FeCl_(3) solution, sometimes a red precipitate is obtained. Reason : Sulphur is also present.

Assertion : Displacement reactions ofchlorine, bromine and iodine using fluorine are not generally carried out in aqueous solution. Reason : Fluorine being highly reactive attacks water and displaces the oxygen of water.

Assertion : Dipole - dipole forces acting between the molecules possessing permanent dipole , are weaker than ion - ion interactions .Reason : The attractive forces decrease with the increase of distance between the dipoles .