52671 + Interview Questions in Chemistry in Class 11

1.	Assertion . Magnesium keeps on burning in CO_(2) . Reason . Magnesiumreduces CO_(2) to C .
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

2.	Assertion . Magnesium can be obtained by the electrolysis of aqueous MgCl_(2). Reason. The electrode potential of Mg^(2+) is far higher than that of H_(2)O.
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 . Mg can be obtained by the electrolysis of FUSED `MgCl_(2)`. Correct reason . The ELECTRODE potential of `Mg^(2+)` is far lower `(-2*36V)` than that of `H_(2)O` (-0.083V)`

Discussion

3.	Assertion : Lower the critical temperature of the gas, more easily can it be liquefied. Reason : Critical temperature is the temperature above which a gas can not be liquefied depending upon the pressure.
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 :D

Discussion

4.	Assertion: lonisation energy of sulphur is less than that of phosphorus. Reason: Half filled p-orbitals have extra stability.
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 :A

Discussion

5.	Assertion. London smog is oxidising in nature Reason. London smog contains O_3,NO_2 and hydrocarbon
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 Assertion. LONDON smog contains `SO_2` and carbon and hence it is reducing in nature Correct Reason. London smog contains `SO_2` and carbon particulates

Discussion

6.	Assertion: Lithium resembles magnesium diagonally placed in next group. Reason: The size of Li^(+) and Mg^(2+) are different and their electropositive character is same.
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 :The SIZE of `Li^(+) and Mg^(2+)` are nearly the same.

Discussion

7.	Assertion. London forces of are the attractive forces existing among non-polar molecules or noble gases. Reason. London forces are the attractive forces which operate at all distances between the molecules atoms.
Answer» Solution :Correct R. London FORCES operate only at very SHORT distances (`~500" PM"`).

Discussion

8.	Assertion : Lithium is in diagonal relationship with magnesium Reason : Li^+ has same size as Mg^(2+)
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 :A

Discussion

9.	Assertion: Lithium fluoride is most covalent in nature. Reason: Small anion an be easily distorted.
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 :`Li^(+)` ION is very small in size and has high tendency to distort electron clud AROUND the negative halide ion. Anion with LARGE size and be easily distorted hence among halides, LITHIUM iodide is the most covalent in NATURE.

Discussion

10.	Assertion : Liquids and solids are hard to compress . Reason : Magnitude of the repulsive forces between the molecules rises very rapidly as the distance separating the molecules decreases .
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 :In liquid and SOLID states, molecules are ALREADY in CLOSE contact, therefore they resist further compression, as that would RESULT in the increase of replusive interactions.

Discussion

11.	Assertion : LiAlH_(4) reduces esters to acids Reason : Esters which containe alpha- hydrogen undergo Claisen condensation
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 :D

Discussion

12.	Assertion . Li_(2)CO_(3) and Na_(2)CO_(3) are thermally stable. Reason . Both the carbonates are salts of large cations and large anions .
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 . `Li_(2)CO_(3)` is unstable and decompose on heating to FORM `Li_(2)O` and `CO_(2)` but `Na_(2)CO_(3)` is thermally STABLE . Correct reason . `Li_(2)CO_(3)` is thermally unstable because it is SALT of a small cation and big anion . In contrast , `Na_(2)CO_(3)` is thermally stable because a bigger cation stabilizes a bigger anion .

Discussion

13.	Assertion .LiCl predominantly covalent compond . Reason . Electronegativity difference between Li and Cl is too small .
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. LI being small POLARIZES the large `Cl^(-)` ion thereby making LiCl predominantly covalent .

Discussion

14.	Assertion . Li resembles Mg. Reason . Li^(+) has approximately the same size as Mg^(2+)
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

15.	Assertion : Lassaigne's test is not shown by diazonium salts. Reason : Diazonium salts lose N_(2) on heating much before they have a chance to react with fused sodium. 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 Answer :A

Discussion

16.	Assertion : Ketones can't be prepared from RCOCl and a Grignard reagent R'MgCl Reason : The Grignard reagent reacts faster with any ketone formed than it does with RCOCl
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 :A

Discussion

17.	Assertion : K_(20). AI_(2)O_(3).SiO_(2). 6H_(2)O is the empirical formula of potash alum. Reason : It is a double salt.
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

18.	Assertion . K , Rb and Cs form superoxides . Reason . The stability of the superoxides increases from K to Cs due to decrease in lattice energy .
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 for SALTS of larger anions , the lattice energy increases with increase in the size of the cation from `K^(+)` to `Cs^(+)` , THEREFORE , the stability of their superoxides increases from K to Cs.

Discussion

19.	Assertion : It is necessary to know the concentration of flouride ion in dirnking water. Reason: The increase in amount of fluride ion causes tribes in tooth and bones.
Answer» Both Assertion and Reason are correct and the reason is the correct EXPLANATION for assertion. Both assertion and reason are correct, but the reason is not correct explanation of assertion. Both the assertion and reason are incorrect. The assertion is incorrect but the reason is correct. Solution :Amount of `F^-` ION is UPTO 1 ppm it make the enamel on teeth much harder by converting hydroxy APATITE into fluorapatite. Amount is above 2 ppm it causes brown mottling of teeth. Amount is above 10 ppm it causes harmful effect to bones and teeth.

Discussion

20.	Assertion : IUPAC name of compound CH_(3)CH=CH-CHO is but-2-enal. Reason : Functional group gets preference over multiple bond in the IUPAC name of a compound.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION 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 both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

21.	Assertion: Isoelectronic ions have same number of electrons as well protons. Reason: The number protons among the isoelectronic ions are different.
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

22.	Assertion :IPUAC name of compound is but-2-enal.Reason :functional group gets preference over multipule in IUPAC name of a compound
Answer» If both assertion and reason are CORRECT and REASONIS crect explanation for assertion If both assertion and reason are correct but reasonis not cottect explanation for assertion If reason is correct but assertion is incorrect If both assertion and reason are incorrect Answer :a

Discussion

23.	Assertion . Ionic compounds tend to be non-volatile. Reason . Ionic compounds are solid
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. The intermolecular forces in IONIC compounds are very STRONG .

Discussion

24.	Assertion: Iodination of alkanes is carried out in the presence of oxidising agents like HIO_(3) or HNO_(3). Reason: Iodination of alkanes is an irreversible 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 :Iodination of alkanes is a reversible reaction and therefore it is carried out with oxidising agents like `HIO_(3) and HNO_(3)` which combine with HI so that the reaction goes in forward direction. `CH_(4)+I_(2) HARR CH_(3)I +HI,HIO_(3)+5HI to 3I_(2)+3H_(2)O` `A-X+2Na+X-B to A-A+B-B+A-B+B-A`

Discussion

25.	Assertion : Iodimetric titrations are redox titrations. Reason : The iodine solution acts as an oxidising agent.
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

26.	Assertion : Insert electrolytes like KCl, KNO_(3) are used in salt bridge. Reason : Salt bridge provides an electric contact between the two solutions without allowing them to mix with each other.
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

27.	Assertion : Industrial method of preparation of H_2O_2 involves 2-ethylanthara quinol. Reason : The process is cyclic.
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 :A

Discussion

28.	Assertion: Increase in surface area, increases rate of evaporation. Reason: Stronger the intermolecular attactive forces, first is the rate of evaporation at a given 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 :It is true that if we increase the surface area the rate of evaporation also increase3 as evaporation is always TAKES place from the surface, bot if the intermolecular attraction is stronger than the rate of evaporation is SLOWER.

Discussion

29.	Assertion : In titrations involving potassium permanganate no indicator is used. Reason : MnO_(4)^(-) acts as the self-indicator.
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

30.	Assertion : In the titration of HCl against NaOH, phenolphthalein is used as suitable indicator. Reason : Phenolphthalein is pink coloured in basic medium.
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

31.	Assertion : In the species, S_(4)O_(6)^(2-) each of the two extreme sulphurs exhibits oxidation state of +5 and the two middle sulphurs as zero. Reason : Theaverage of four oxidation numbers of sulphurs of the S_(4)O_(6)^(2-) is 2.5.
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 :The structure of `S_(4)O_(6)^(2-)` is `.^(-)O-underset(underset(O)("\|\|"))overset(overset(O)("\|\|+5"))("S")-overset(0)S-overset(0)S-underset(underset(O)("\|\|"))overset(overset(O)("\|\|+5"))("S")-O^(-)` Structural parameters reveal that the element for whom FRACTIONAL oxidation state is realised, is present in different oxidation STATES and differentoxidation states are DUE to different bonding situations.

Discussion

32.	Assertion :In the reaction H_2 S + HNO_3 to NO + S + H_2 O, HNO_3 acts as an oxidising agent.Reason : HNO_3 gets oxidised to NO.
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 :C

Discussion

33.	Assertion in the iiodometirc titration starch is used as an indicator Reason starch is polysacharide
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 In iodometric TITRATION the LIBERATED iodine produces blue colur with starch

Discussion

34.	Assertion . In the electrolysis of aqueous NaCl , Na is preferentially discharged at mercury cathode forming sodium amalgam . Reason . It is due to the fact that hydrogen has a high overvoltage at mercury cathode .
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

35.	Assertion . In rainy season , common salt becomes damp after some time on keeping inair . Reason . Common salts in NaCl which is hygroscopic in nature .
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 . Common salt contains impurities of `MgCl_(2) , CaCl_(2) , MgSO_(4) , CaSO_(4) ,`ETC. which are hygroscopic .

Discussion

36.	Assertion: In queous solution, SO_(2) reacts with H_(2)S liberating sulphur Reason : SO_(2) is an effective reducing agent.
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 :Correct explanation. `SO_(2)` is an effective oxidising agent in this CASE.

Discussion

37.	Assertion : In p-block elements, a lot of variation in properties of elements in a group is observed. Reason : Difference in inner core of electronic configuration greatly influence the physical and chemical properties of elements
Answer» ANSWER :A

Discussion

38.	Assertion: In monohaloarenes, electrophilic substitution occurs at ortho and para positions. Reason: Halogen atom is a ring deactivator.
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 :If both assertion and reason are true but reason is not the correct explanation of assertion.

Discussion

39.	Assertion: IN mono haloarenes, electrophilic substitution occurs at ortho and para positions. Reason: Halogen atom is a ring deactivator
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 assertion and reason are false Solution :If both assertion and reason are true but reason is not the correct explanation of assertion.

Discussion

40.	Assertion : In Maxwell - Boltzmann distribution of speeds , the curve broadens at higher temperature .Reason : At a particular temperature , the individual speed of molecules as well as the distribution of speeds remains the same .
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 :Speed distribution curve broadens at HIGHER temperature because number of molecules moving at higher speed increases. At a particular temperature, the individual speed of molecules KEEPS changing but the distribution of speeds remains same.

Discussion

41.	Assertion : In metallic hydrides hydrogen occupies interstices in the metal lattice producing distortion without any change in its type. Reason: Metallic hydride is also known as Interstitial hydride.
Answer» Both Assertion (A) and REASON (R) are TRUE and Reason (R) is the CORRECT explanation of Assertion (A) Both (A) and (R) are true but (R) is not the correct explanation of (A) (A) is true but (R) is false (A) and (R) both are false. Answer :B

Discussion

42.	Assertion. In Lyman series of H-spectra, the maximum wavelength of lines is 121.56 nm Reason. Wavelength is maximum when the transition is from the very next level
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 :`(1)/(LAMDA) = R_(H) Z^(2) [(1)/(n_(1)^(2)) - (1)/(n_(2)^(2))]` For Lyman series, `n_(1) = 1`. For the next level, `n_(2) = 2`. Hence, `(1)/(n_(1)^(2)) - (1)/(n_(2)^(2))` will be minimum or `lamda` will be maximum. `((1)/(lamda) = 109678 xx (1)^(2) [(1)/(1^(2)) - (1)/(2^(2))] CM^(-1) = 109678 xx (3)/(4) cm^(-1) or lamda = (4)/(3) xx (1)/(109678) cm = 121.56 xx 10^(-7) cm = 121.56 xx 10^(-9) m = 121.56 nm)`

Discussion

43.	Assertion : In iodometic titrations, starch is used as an indicator. Reason : Starch is a polysaccharide.
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. ANSWER :b

Discussion

44.	Assertion : In gaseous phase, H_(2)O and H_(2)O_(2) both have bent structures. Reason Bond angle of both H_(2)O and H_(2)O_(2) is 04.5^(@).
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 :In gaseous phase, WATER molecule has a bent structure with a bond angle of `104.5^(@)`, whereas, `H_(2)O_(2)` has a non-planar structure both in gas and SOLID PHASES. The dihedral angle in gas and solid phase is `111.5^(@)` and `90.2^(@)` RESPECTIVELY.

Discussion

45.	Assertion : In diborane, each B atom is sp^(2) hybridised. Reason : In diborane, the terminal 2-centre-2-electron B-H bonds are called banana bonds.
Answer» SOLUTION :The 2-centre-2-electron BRIDGE BONDS (B……H…….B) are CALLED BANANA bonds.

Discussion

46.	Assertion In crystal lattice,size of the cation is larger in a tetrahedral hole than in a octahedral hole than in a octahedral hole. Reason(R)The cations occupy more space than atoms in crystal packing.
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 :D

Discussion

47.	Assertion : In CH_(2)=C=CH_(2), all the carbon atoms are sp^(2)-hybridized. Reason : All the hydrogen atoms lie in one plane.
Answer» If both assertion and reason are CORRECT and reason is correct explanation 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 both assertion and reason are incorrect. Solution :Correct assertion : `underset((sp^(2)))(CH_(2))=underset((sp))(C)=underset((sp^(2)))(CH_(2))` Correct reason : The hybridisation state of carbon atom is RELATED to the nature of and number of hydrogen atoms ATTACHED to it.

Discussion

48.	Assertion :In ch_2=c=ch_2 all the carbon atmos are sp2 hybridised. Reason: All the hydrpogen atoms lie in one plane
Answer» If both ASSERTION and reason are correct and REASONIS crect EXPLANATION for assertion If both assertion and reason are correct but reasonis not COTTECT explanation for assertion If reason is correct but assertion is incorrect If both assertion and reason are incorrect Answer :d

Discussion

49.	Assertion. In case of polyprotic acids, first ionization constant in lowest. Reason. The removal of first proton is mostdifficult. Further ionization becomes easier.
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 aasertion is true, but reason is false. If both assertion and reason are false. Solution :Correct A. In CASE of polyprotic ACIDS, first ionization CONSTANT is highest. Correct R. First proton is lost easily. Further, loss of `H^(+)` ion becomes difficult because it remains attracted by the negative ion.

Discussion

50.	Assertion: In case of aryl halides, halogens are moderately deactivating. Reason: Halogens are ortho, para directing groups.
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 :Halogens are moderately deactivating. Because of their strong -I effect, OVERAL ELECTRON density of BENZENE ring decreases. Due to resonance, the electron density on o- and p-positions is GREATER than that at the m-position hence, they are o- and p-directing groups.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion . Magnesium keeps on burning in CO_(2) . Reason . Magnesiumreduces CO_(2) to C .

Assertion . Magnesium can be obtained by the electrolysis of aqueous MgCl_(2). Reason. The electrode potential of Mg^(2+) is far higher than that of H_(2)O.

Assertion : Lower the critical temperature of the gas, more easily can it be liquefied. Reason : Critical temperature is the temperature above which a gas can not be liquefied depending upon the pressure.

Assertion: lonisation energy of sulphur is less than that of phosphorus. Reason: Half filled p-orbitals have extra stability.

Assertion. London smog is oxidising in nature Reason. London smog contains O_3,NO_2 and hydrocarbon

Assertion: Lithium resembles magnesium diagonally placed in next group. Reason: The size of Li^(+) and Mg^(2+) are different and their electropositive character is same.

Assertion. London forces of are the attractive forces existing among non-polar molecules or noble gases. Reason. London forces are the attractive forces which operate at all distances between the molecules atoms.

Assertion : Lithium is in diagonal relationship with magnesium Reason : Li^+ has same size as Mg^(2+)

Assertion: Lithium fluoride is most covalent in nature. Reason: Small anion an be easily distorted.

Assertion : Liquids and solids are hard to compress . Reason : Magnitude of the repulsive forces between the molecules rises very rapidly as the distance separating the molecules decreases .

Assertion : LiAlH_(4) reduces esters to acids Reason : Esters which containe alpha- hydrogen undergo Claisen condensation

Assertion . Li_(2)CO_(3) and Na_(2)CO_(3) are thermally stable. Reason . Both the carbonates are salts of large cations and large anions .

Assertion .LiCl predominantly covalent compond . Reason . Electronegativity difference between Li and Cl is too small .

Assertion . Li resembles Mg. Reason . Li^(+) has approximately the same size as Mg^(2+)

Assertion : Lassaigne's test is not shown by diazonium salts. Reason : Diazonium salts lose N_(2) on heating much before they have a chance to react with fused sodium. Reason : Molecular weight is twice density.

Assertion : Ketones can't be prepared from RCOCl and a Grignard reagent R'MgCl Reason : The Grignard reagent reacts faster with any ketone formed than it does with RCOCl

Assertion : K_(20). AI_(2)O_(3).SiO_(2). 6H_(2)O is the empirical formula of potash alum. Reason : It is a double salt.

Assertion . K , Rb and Cs form superoxides . Reason . The stability of the superoxides increases from K to Cs due to decrease in lattice energy .

Assertion : It is necessary to know the concentration of flouride ion in dirnking water. Reason: The increase in amount of fluride ion causes tribes in tooth and bones.

Assertion : IUPAC name of compound CH_(3)CH=CH-CHO is but-2-enal. Reason : Functional group gets preference over multiple bond in the IUPAC name of a compound.

Assertion: Isoelectronic ions have same number of electrons as well protons. Reason: The number protons among the isoelectronic ions are different.

Assertion :IPUAC name of compound is but-2-enal.Reason :functional group gets preference over multipule in IUPAC name of a compound

Assertion . Ionic compounds tend to be non-volatile. Reason . Ionic compounds are solid

Assertion: Iodination of alkanes is carried out in the presence of oxidising agents like HIO_(3) or HNO_(3). Reason: Iodination of alkanes is an irreversible reaction.

Assertion : Iodimetric titrations are redox titrations. Reason : The iodine solution acts as an oxidising agent.

Assertion : Insert electrolytes like KCl, KNO_(3) are used in salt bridge. Reason : Salt bridge provides an electric contact between the two solutions without allowing them to mix with each other.

Assertion : Industrial method of preparation of H_2O_2 involves 2-ethylanthara quinol. Reason : The process is cyclic.

Assertion: Increase in surface area, increases rate of evaporation. Reason: Stronger the intermolecular attactive forces, first is the rate of evaporation at a given temperature

Assertion : In titrations involving potassium permanganate no indicator is used. Reason : MnO_(4)^(-) acts as the self-indicator.

Assertion : In the titration of HCl against NaOH, phenolphthalein is used as suitable indicator. Reason : Phenolphthalein is pink coloured in basic medium.

Assertion : In the species, S_(4)O_(6)^(2-) each of the two extreme sulphurs exhibits oxidation state of +5 and the two middle sulphurs as zero. Reason : Theaverage of four oxidation numbers of sulphurs of the S_(4)O_(6)^(2-) is 2.5.

Assertion :In the reaction H_2 S + HNO_3 to NO + S + H_2 O, HNO_3 acts as an oxidising agent.Reason : HNO_3 gets oxidised to NO.

Assertion in the iiodometirc titration starch is used as an indicator Reason starch is polysacharide

Assertion . In the electrolysis of aqueous NaCl , Na is preferentially discharged at mercury cathode forming sodium amalgam . Reason . It is due to the fact that hydrogen has a high overvoltage at mercury cathode .

Assertion . In rainy season , common salt becomes damp after some time on keeping inair . Reason . Common salts in NaCl which is hygroscopic in nature .

Assertion: In queous solution, SO_(2) reacts with H_(2)S liberating sulphur Reason : SO_(2) is an effective reducing agent.

Assertion : In p-block elements, a lot of variation in properties of elements in a group is observed. Reason : Difference in inner core of electronic configuration greatly influence the physical and chemical properties of elements

Assertion: In monohaloarenes, electrophilic substitution occurs at ortho and para positions. Reason: Halogen atom is a ring deactivator.

Assertion: IN mono haloarenes, electrophilic substitution occurs at ortho and para positions. Reason: Halogen atom is a ring deactivator

Assertion : In Maxwell - Boltzmann distribution of speeds , the curve broadens at higher temperature .Reason : At a particular temperature , the individual speed of molecules as well as the distribution of speeds remains the same .

Assertion : In metallic hydrides hydrogen occupies interstices in the metal lattice producing distortion without any change in its type. Reason: Metallic hydride is also known as Interstitial hydride.

Assertion. In Lyman series of H-spectra, the maximum wavelength of lines is 121.56 nm Reason. Wavelength is maximum when the transition is from the very next level

Assertion : In iodometic titrations, starch is used as an indicator. Reason : Starch is a polysaccharide.

Assertion : In gaseous phase, H_(2)O and H_(2)O_(2) both have bent structures. Reason Bond angle of both H_(2)O and H_(2)O_(2) is 04.5^(@).

Assertion : In diborane, each B atom is sp^(2) hybridised. Reason : In diborane, the terminal 2-centre-2-electron B-H bonds are called banana bonds.

Assertion In crystal lattice,size of the cation is larger in a tetrahedral hole than in a octahedral hole than in a octahedral hole. Reason(R)The cations occupy more space than atoms in crystal packing.

Assertion : In CH_(2)=C=CH_(2), all the carbon atoms are sp^(2)-hybridized. Reason : All the hydrogen atoms lie in one plane.

Assertion :In ch_2=c=ch_2 all the carbon atmos are sp2 hybridised. Reason: All the hydrpogen atoms lie in one plane

Assertion. In case of polyprotic acids, first ionization constant in lowest. Reason. The removal of first proton is mostdifficult. Further ionization becomes easier.

Assertion: In case of aryl halides, halogens are moderately deactivating. Reason: Halogens are ortho, para directing groups.