52671 + Interview Questions in Chemistry in Class 11

1.	Assertion. Carbon monoxide is highly toxic. Reason. Carbon monoxide forms a stable complex with haemoglobin present in red blood cells.
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. Answer :A

Discussion

2.	Assertion : Carbon monoxide is a poisonous gas Reason : Carbon monoxide combines with hameoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.
Answer» ANSWER :A

Discussion

3.	Assertion: Carbon is not used as a reducing agent for the extraction of group 2 metals, Reason: Carbon react with group 2 metals to give carbides.
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 reason(R) are true and R is the correct explanation of A.

Discussion

4.	Assertion :Carbocations are planar in nature. Reason: Carbocations are sp2 hybridised
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

5.	Assertion. Calgon is used for removing Ca^(2+) and Mg^(2+) ions. Reason. Calgon forms precipate with Ca^(2+) and Mg^(2+) ions.
Answer» Solution :Correct ASSERTION. Calgon renders `Ca^(2+)` and `MG^(2+)` ions PRESENT in HARD water INEFFECTIVE. Correct reason. Calgon forms soluble complex with `Ca^(2+) and Mg^(2+)` ions.

Discussion

6.	Assertion: Calgon is used for removing Ca^(2+) and Mg^(2+) ions from hard water. Reason: Calogon forms precipatate with Ca^(2+) and Mg^(2+) ions.
Answer» Solution :(d) Correct assertion: Calgon MAKES `Ca^(2+) and MG^(2+)` ions present in hard WATER ineffective. Correct reason: CALOGON forms soluble complex with `Ca^(2+) and Mg^(2+) ions`.

Discussion

7.	Assertion. Calcium carbide on hydrolysis gives ethylene Reason. Calcium carbide contains C^(4-) 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. Calcium carbide on HYDROLYSIS gives ACETYLENE. Correct reason. `CaC_2` contains `C_2^(2-)` anion.

Discussion

8.	Assertion . Calcium and magnesium oxides are not reduced by carbon . Reason . Calcium and magnesium oxides react with carbon to form their respective carbides .
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

9.	Assertion. CaF_(2) has been given the name fluorspar . Reason. Solid CaF_(2) emits light when heated .
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

10.	Assertion CaCo_(3)shows polymorphism. Reason(R)CaCO_(3) exists in two forms called calcite and aragonite.
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 :A

Discussion

11.	Assertion : C_60 fullereneis an allotropes of carbon. Reason : In fullerene, five carbon membered ring arrange on every side of ring.
Answer» STATEMENT Assertion and REASON both are right. Statement Reason is correct EXPLANATION of statement Assertion. Statement Assertion and Reason both are right , but Assertion is not correct explanation of statement Assertion. Statement Assertion is right but statement Reason is wrong Both statement Assertion and Reason are wrong . SOLUTION :Statement Assertion and Reason both are right , but Assertion is not correct explanation of statement Assertion.

Discussion

12.	Assertion. C_(60)fullerene is an allotrope of carbon. Reason. In C_(60)fullerene, five membered ringsisolated from each other.
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 explanation. Like graphite and diamond,`C_(60)` on buringgives `CO_(2)`.

Discussion

13.	Assertion. C-H bond in ethyne is shorter than C-H bonds in ethene. Reason. Carbon atom in ethene is sp hybridised while it is sp^3 in ethyne.
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. Carbon atom in ETHENE is `SP^2`-hybridized while it is sp hybridized in ETHYNE.

Discussion

14.	Assertion : Butane and 2-methyl butane are chain isomers. Reason : Butane is a straight chain alkane while 2-methyl butane is a branched chain alkane.
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 :B

Discussion

15.	Assertion : Butane and 2-methylbutane are homologues. Reason : Butane is a straight chain alkene while 2-methylbutane is a branched chain alkene.
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 explanation : The TWO differ in their MOLECULAR formula by `-CH_(2)` group.

Discussion

16.	Assertion: Butane and 2-methylbutane are homologues. Reason: Butane is a straight chain alkane while while 2-methylbutane is a branched chain alkane.
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. They differ by a `CH_(2)` group.

Discussion

17.	Assertion. But-2-yne on reduction with Na//NH_3(l)gives trans-2-butene Reason. To minimise interelectronic repulsions, the addition of electrons occurs on the opposite faces of the triple bond.
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

18.	Assertion : But-1-ene and 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.
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 : But-1-ene & 2-methylprop-1-ene are not POSITION isomers. Correct reason : Position isomers differ in the position of DOUBLE bond.

Discussion

19.	Assertion. But 1-yne and but-2-yne can be distinguished by ammoniacal silver nitration solution Reason. 1-Butyne forms white ppt. with ammoniacal silver nitrate but 2-butyne does not
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

20.	Assertion :But-1-ene2-Methylprop-1-ene are position isomers. Reason Position ismoers have same molecular formula but different arrangrment of carbon atoms
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 Ifboth assertionand reason are incorrect Answer :d

Discussion

21.	Assertion: But -1-ene and 2-methyl prop-1-ene are position isomers. Reason: Position isomers have same molecular formula but differ in the position of functional group
Answer» Both Assertion and REASON are true and reason is not the correct EXPLANATION of the Assertion Assertion is true but reason is false Assertion is false but reason is true Both assertion and reason are true and reason is the correct explanation of the assertion Solution :`underset("bute-1-ene")(CH_(2)=CH-CH_(2)CH_(3))\| underset("2-methyl prop-1-ene")(CH_(2)=overset(overset(CH_(3))(\|))( C)-CH_(3))` These two are not POSITION ISOMERS

Discussion

22.	Assertion : But-1-ene amd 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.
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. But-1-ene and 2-methylprop-1-ene are chain ISOMERS. Correct reason. Chain isomers have same MOLECULAR formula but DIFFERENT ARRANGEMENT of carbon atoms.

Discussion

23.	Assertion . Both pi(2p_(x)) and pi^(**) (2p_(x)) molecular orbitals have one nodal plane each . Reason. All molecular orbitals formed by sideway overlapping of 2 p orbitals have one nodal plane.
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 A . `pi (2p_(x))` has ONE nodalplane WHEREAS ` pi^(**) (2p_(x))` has two nodal planes . Correct R. Bonding `pi-`molecular orbitals have one nodal plane whereas antibonding `pi`-molecular orbitals have two nodal planes.

Discussion

24.	Assertion Both o-hydroxy benzaldehyde and p-hydroxy benzaldehyde have
Answer» <P>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 , o-hydroxybenzaldehyde forms intramolecularhydrogen bond WHEREAS p- hydroxybenzaldehyde forms inermolecular hydrogen BONDS.

Discussion

25.	Assertion. Boron always formscovalent compounds. Reason. The small size of B^(3+)favours formation of covalentbonds.
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. Answer :A

Discussion

26.	Assertion: Boraxbead test is not suitable for Al(III) . Reason: Al_2O_3 is water insoluble.
Answer» Statement ASSERTION and Reason both are right. Statement Reason is CORRECT explanation of statement Assertion. Statement Assertion and Reason both are right , but Assertion is not correct explanation of statement Assertion. Statement Assertion is right but statement Reason is wrong Both statement Assertion and Reason are wrong . SOLUTION :Statement Assertion and Reason both are right , but Assertion is not correct explanation of statement Assertion.

Discussion

27.	Assertion : Bond order of F_(2) is one . Reaso : ABMO electrons are 2 unit less than BMO.
Answer» ASSERTION (A) and Reason (R) both are correct and (R) gives correct explanation. Assertion (A) and Reason (R) correct, but Reason is not proper reason. Assertion is correct, but Reason is wrong. Assertion and Reason both incorrect. Solution :Assertion (A) and Reason (R) both are correct and (R) gives correct explanation. `F_(2) (9 + 9 = 18)` `(sigma_(1s))^(2) lt (sigma_(1s)^())^(2) lt (sigma_(2s))^(2) lt (sigma_(2s)^())^(2) lt (sigma_(2pz)^())^(2) lt (pi_(2PX))^(2)= (pi_(2py))^(2) lt (pi_(2p_(x))^())^(2) (pi_(2p_(y)))^(2)` `{:("Electron of BMO =10"),("Electron of ABMO" = 8):}} ` so , BO = `(1)/(2) (N_(b) - N_(a) ) = (1)/(2) (10 - 8) = 1 `

Discussion

28.	Assertion. Borax bead test is not stuitablefor Al (III). Reason. Al_(2)O_(3) is insoluble in 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 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 explanation. `Al_(2)O_(3)` beingcolourless DOESNOT form a coloured borax bead.

Discussion

29.	Assertion . Bond order can assume any value including zero. Reason. Higher the bond order, shorter is the bond length and greater is the bond energy.
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 . Bond ORDER ` = (1)/(2) (N_(b) - N_(a))`

Discussion

30.	Assertion. Boiling points of cis-isomers are higher than those of trans-isomers Reason. Dipole moments of cis-isomers are higher than those of trans-isomers
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 . Boiling points of cis-isomers are higher than trans-isomers. Reason. Dipole moment of cis-isomers are higher than trans-isomers
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 :cis-isomers have GREATER dipole MOMENT . GRETER the dipole moment, higher is the boiling point

Discussion

32.	Assertion: Boiling point of pentane is higher than 2,2-dimethylpropane. Reason: There is steady increase in boiling point with increase in molecular mass.
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 :PENTANE and 2,2-dimethylpropane are isomers having same molecular formula. Pentane has high boiling point because it is straight chain isomer whereas 2,2-dimethylpropane is branched chain DUE to which the MOLECULE attains the shape of a sphere. Thus, results in smaller area of contact and therefore weak intermolecular forces.

Discussion

33.	Assertion: Boiling point decreases from lithium to Cs among elements of group 1. Reason: The configuration of the elements of group 1 is ns^1 when n varies from 1 to 7.
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 :B

Discussion

34.	Assertion : B(OH)_3is acidic in nature while In(OH)_3 is basic in nature. Reason: B(OH)_3 form network like structure by strong H-bond.
Answer» STATEMENT ASSERTION and REASON both are right. Statement Reason is correct EXPLANATION of statement Assertion. Statement Assertion and Reason both are right , but Assertion is not correct explanation of statement Assertion. Statement Assertion is right but statement Reason is WRONG Both statement Assertion and Reason are wrong . Solution :Statement Assertion is right but statement Reason is wrong

Discussion

35.	Assertion . Bleaching powder is a mixed salt . Reason . In the presence of CoCl_(2) , bleaching powder decompose to give CaCl_(2) and O_(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. Solution :CORRECT explanation . Bleaching powder is a mixed salt of `Ca(O Cl)_(2) , CaCl_(2)` and `Ca(OH)_(2) , CaCl_(2)` DECOMPOSES `Ca(O Cl)_(2)` to form `CaCl_(2)` and `O_(2)`.

Discussion

36.	Assertion . BF_(3) molecular is planar but NF_(3) pyramidal Reason . N atom is smaller than B
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 . In `BF_(3)` , B is `sp^(2)` -hybridised . Hence , it is TRIANGULAR planar . In `NF_(3)`, N is `sp^(3)` - hybridized with one position occupied by a lone Hence , it is PYRAMIDAL

Discussion

37.	Assertion : beta -particles are very effective projectile for transformation. Reason : beta -particles are negatively charged particles having very small mass andhence very small momentum
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 :D

Discussion

38.	Assertion. Between SiCl_(4) and "CCl"_(4), only SiCl_(4) reacts with water. Reason. SiCl_(4)is ionicand "CCl"_(4)is covalent.
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. Sihas d-orbitalsto acceptelectronsdonated by waterbut C does not. THEREFORE,`SiCl_(4)` reacts with water but `"CCl"_(4)` does not.

Discussion

39.	Assertion : BeSO_4 is soluble in water while BaSO_4 is not Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
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 true and reason is the correct explanation of assertion

Discussion

40.	Assertion : BeSO_(4), is soluble in water while BaSO_(4) is not Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remian almost constant
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 true and reason is the correct explanation of as

Discussion

41.	Assertion. Beryllium hydride is a covalent hydride. Reason. The electronegativity difference between Be and H is very hig.
Answer» Solution :CORRECT reason. The ELECTRONEGATIVITY difference between Be (1.5) and H (2.1) is SMALL.

Discussion

42.	Assertion : Beryllium compounds are covalent in nature Reason : The size of Be^(2+) ion Iarger in comparison to the radii of the other divalent ions of alkaline earth metals.
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 :C

Discussion

43.	Assertion: Benzyl bromide when kept in acetone-water, it produces benzyl alcohol. Reason The reaction follows S_(N)2 mechanism.
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 :C

Discussion

44.	Assertion : Benzoic acid is stronger acid than formic acid Reason : Phenyl group when attached to carbonyl group becomes electron donating
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

45.	Assertion. Benzene does not decolourize Br_2- water Reason. Benzene is stabilized by resonance due to delocalization of pi-electrons.
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

46.	Assertion . B_(2) moleculei is diamagnetic . Reason . The highest occupied molecular orbital is of sigma-type .
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 :Coreect A. `B_(2)` MOLECULE is PARAMAGNETIC (M.O.E.C of`B_(2) = KK sigma_(2S)^(2)sigma_(2s)^(**2) pi_(2p_(x))^(1) pi_(2p_(y))^(1))`. Correct R . The highest occupied M.O. is `pi` and not `SIGMA`- type .

Discussion

47.	Assertion: Atomic orbital in an atom is designated by n,l,m_1 and m_s Reason: These are helpful in designating electron present in an orbital.
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 assertion is false but reason is true Solution :Assertion is false but reason is true. Atomic orbital is designated by n,L and `m_1` while state of an electron in an atom in specified by the FOUR quantum numbrs n,l,`m_1`, and `m_s`.

Discussion

48.	Assertion : Atomic radius of Ga is larger than that of aluminium Reason : Atomic radius always increases down the groups.
Answer» Solution :There are DEVIATIONS in properties of elements of a group in p-block Atomic radius of Ga is LESS than that al Al because of the PRESENCE of additional 10 d-electrons which offer POOR screeningeffect for the outer electrons from the increased nuclear charge in gallium.

Discussion

49.	Assertion : At zero kelvin the volume occupied by a gas is negligible Reason : All translational molecular motion cease at 0 K
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 :D

Discussion

50.	Assertion. At the critical temperature, the densities of the gaseous and liquid phase become equal. Reason. At the critical point, surface of separation between the liquid phase and the gaseous phase disappears.
Answer» SOLUTION :R is the CORRECT EXPLANATION of A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion. Carbon monoxide is highly toxic. Reason. Carbon monoxide forms a stable complex with haemoglobin present in red blood cells.

Assertion : Carbon monoxide is a poisonous gas Reason : Carbon monoxide combines with hameoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.

Assertion: Carbon is not used as a reducing agent for the extraction of group 2 metals, Reason: Carbon react with group 2 metals to give carbides.

Assertion :Carbocations are planar in nature. Reason: Carbocations are sp2 hybridised

Assertion. Calgon is used for removing Ca^(2+) and Mg^(2+) ions. Reason. Calgon forms precipate with Ca^(2+) and Mg^(2+) ions.

Assertion: Calgon is used for removing Ca^(2+) and Mg^(2+) ions from hard water. Reason: Calogon forms precipatate with Ca^(2+) and Mg^(2+) ions.

Assertion. Calcium carbide on hydrolysis gives ethylene Reason. Calcium carbide contains C^(4-) anions

Assertion . Calcium and magnesium oxides are not reduced by carbon . Reason . Calcium and magnesium oxides react with carbon to form their respective carbides .

Assertion. CaF_(2) has been given the name fluorspar . Reason. Solid CaF_(2) emits light when heated .

Assertion CaCo_(3)shows polymorphism. Reason(R)CaCO_(3) exists in two forms called calcite and aragonite.

Assertion : C_60 fullereneis an allotropes of carbon. Reason : In fullerene, five carbon membered ring arrange on every side of ring.

Assertion. C_(60)fullerene is an allotrope of carbon. Reason. In C_(60)fullerene, five membered ringsisolated from each other.

Assertion. C-H bond in ethyne is shorter than C-H bonds in ethene. Reason. Carbon atom in ethene is sp hybridised while it is sp^3 in ethyne.

Assertion : Butane and 2-methyl butane are chain isomers. Reason : Butane is a straight chain alkane while 2-methyl butane is a branched chain alkane.

Assertion : Butane and 2-methylbutane are homologues. Reason : Butane is a straight chain alkene while 2-methylbutane is a branched chain alkene.

Assertion: Butane and 2-methylbutane are homologues. Reason: Butane is a straight chain alkane while while 2-methylbutane is a branched chain alkane.

Assertion. But-2-yne on reduction with Na//NH_3(l)gives trans-2-butene Reason. To minimise interelectronic repulsions, the addition of electrons occurs on the opposite faces of the triple bond.

Assertion : But-1-ene and 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.

Assertion. But 1-yne and but-2-yne can be distinguished by ammoniacal silver nitration solution Reason. 1-Butyne forms white ppt. with ammoniacal silver nitrate but 2-butyne does not

Assertion :But-1-ene2-Methylprop-1-ene are position isomers. Reason Position ismoers have same molecular formula but different arrangrment of carbon atoms

Assertion: But -1-ene and 2-methyl prop-1-ene are position isomers. Reason: Position isomers have same molecular formula but differ in the position of functional group

Assertion : But-1-ene amd 2-methylprop-1-ene are position isomers. Reason : Position isomers have same molecular formula but different arrangement of carbon atoms.

Assertion . Both pi(2p_(x)) and pi^(**) (2p_(x)) molecular orbitals have one nodal plane each . Reason. All molecular orbitals formed by sideway overlapping of 2 p orbitals have one nodal plane.

Assertion Both o-hydroxy benzaldehyde and p-hydroxy benzaldehyde have

Assertion. Boron always formscovalent compounds. Reason. The small size of B^(3+)favours formation of covalentbonds.

Assertion: Boraxbead test is not suitable for Al(III) . Reason: Al_2O_3 is water insoluble.

Assertion : Bond order of F_(2) is one . Reaso : ABMO electrons are 2 unit less than BMO.

Assertion. Borax bead test is not stuitablefor Al (III). Reason. Al_(2)O_(3) is insoluble in H_(2)O.

Assertion . Bond order can assume any value including zero. Reason. Higher the bond order, shorter is the bond length and greater is the bond energy.

Assertion. Boiling points of cis-isomers are higher than those of trans-isomers Reason. Dipole moments of cis-isomers are higher than those of trans-isomers

Assertion . Boiling points of cis-isomers are higher than trans-isomers. Reason. Dipole moment of cis-isomers are higher than trans-isomers

Assertion: Boiling point of pentane is higher than 2,2-dimethylpropane. Reason: There is steady increase in boiling point with increase in molecular mass.

Assertion: Boiling point decreases from lithium to Cs among elements of group 1. Reason: The configuration of the elements of group 1 is ns^1 when n varies from 1 to 7.

Assertion : B(OH)_3is acidic in nature while In(OH)_3 is basic in nature. Reason: B(OH)_3 form network like structure by strong H-bond.

Assertion . Bleaching powder is a mixed salt . Reason . In the presence of CoCl_(2) , bleaching powder decompose to give CaCl_(2) and O_(2) .

Assertion . BF_(3) molecular is planar but NF_(3) pyramidal Reason . N atom is smaller than B

Assertion : beta -particles are very effective projectile for transformation. Reason : beta -particles are negatively charged particles having very small mass andhence very small momentum

Assertion. Between SiCl_(4) and "CCl"_(4), only SiCl_(4) reacts with water. Reason. SiCl_(4)is ionicand "CCl"_(4)is covalent.

Assertion : BeSO_4 is soluble in water while BaSO_4 is not Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

Assertion : BeSO_(4), is soluble in water while BaSO_(4) is not Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remian almost constant

Assertion. Beryllium hydride is a covalent hydride. Reason. The electronegativity difference between Be and H is very hig.

Assertion : Beryllium compounds are covalent in nature Reason : The size of Be^(2+) ion Iarger in comparison to the radii of the other divalent ions of alkaline earth metals.

Assertion: Benzyl bromide when kept in acetone-water, it produces benzyl alcohol. Reason The reaction follows S_(N)2 mechanism.

Assertion : Benzoic acid is stronger acid than formic acid Reason : Phenyl group when attached to carbonyl group becomes electron donating

Assertion. Benzene does not decolourize Br_2- water Reason. Benzene is stabilized by resonance due to delocalization of pi-electrons.

Assertion . B_(2) moleculei is diamagnetic . Reason . The highest occupied molecular orbital is of sigma-type .

Assertion: Atomic orbital in an atom is designated by n,l,m_1 and m_s Reason: These are helpful in designating electron present in an orbital.

Assertion : Atomic radius of Ga is larger than that of aluminium Reason : Atomic radius always increases down the groups.

Assertion : At zero kelvin the volume occupied by a gas is negligible Reason : All translational molecular motion cease at 0 K

Assertion. At the critical temperature, the densities of the gaseous and liquid phase become equal. Reason. At the critical point, surface of separation between the liquid phase and the gaseous phase disappears.