Question Set B

CBSE 12th Standard Chemistry Coordination Compounds HOT Questions Study Material - QB365

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Questions:

Multiple Choice Question

20 x 1 = 20

Which of the following statement is correct?

(a)

Fibrous proteins are generally soluble in water.

(b)

Albumin is an example of fibrous proteins.

(c)

In fibrous proteins, the structure is stabilised by hydrogen bonds and disulphide bonds.

(d)

pH does not affect the primary structure of protein.

The change in optical rotation of freshly prepared solution of glucose is known as

(a)

racemisation

(b)

specific rotation

(c)

mutarotation

(d)

tautomerism

Choose the amide which on reduction with LiAlH₄ gives secondary amine

(a)

Ethanamide

(b)

N-Methyl ethanamide

(c)

N, N-diethyl ethanamide

(d)

Benzamid

Which of the following is the weakest Bronsted base?

(a)

(b)

(c)

(d)

CH₃NH₂

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with complexes: CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

(a)

3AgCl, 1AgCl, 2AgCl

(b)

3AgCl, 2AgCl, 1AgCl

(c)

2AgCl, 3AgCl, 2AgCl

(d)

1AgCl, 3AgCl, 2AgCl

The name of complex [Fe(CN)₆]^3- is

(a)

Tricyanido ferrate (III) ion

(b)

Hexacyanido ferrate (III) ion

(c)

Hexacyanido iron (Ill)

(d)

Hexacyanido ferrate (II) ion

Which of the following is a fat soluble vitamin?

(a)

Vitamin A

(b)

Vitamin B₆

(c)

Vitamin C

(d)

Vitamin B₂

Name the product obtained on the hydrolysis of protein.

(a)

Only \(\beta\)-amino acids

(b)

Only \(\alpha\)-amino acids

(c)

Only \(\beta\)- carboxylic acids

(d)

Only \(\alpha\)-carboxylic acids

Structure of [Ni(CO)₄] is

(a)

tetrahedral

(b)

square planar

(c)

octahedral

(d)

None of these

10.

Basicity of CH₃CH₂NH₂ (I), CH₃CONH₂ (II) and C₆H₅CONH₂ (III) follows the order:

(a)

I > II > III

(b)

I > III > II

(c)

II > III >I

(d)

III > II >I

11.

Considering the basic strength of amines in aqueous solution, which one has the smallest pK_b value?

(a)

C₆H₅NH₂

(b)

(CH₃)₂NH

(c)

CH₃NH₂

(d)

(CH₃)₃N

12.

Subunits present in haemoglobin are:

(a)

(b)

(c)

(d)

13.

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be .......... .

(a)

primary structure of proteins

(b)

secondary structure of proteins

(c)

tertiary structure of proteins

(d)

quaternary structure of proteins

14.

Which of the following exists as a zwitterion?

(a)

p-Aminophenol

(b)

Salicylic acid

(c)

p-Aminophenol

(d)

Salicylic acid

15.

Choose the incorrect statement

(a)

Primary amines show intermolecular hydrogen bonds.

(b)

tert-Butylamine is a primary amine.

(c)

Tertiary amines do not show intermolecular hydrogen bonds.

(d)

Isopropylamine is a secondary amine.

(e)

Amineshave lower boiling points as compared to those of alcohols of comparable molecular mass.

16.

Which of the following species is not expected to be a ligand ?

(a)

(b)

NH\(^+_4\)

(c)

NH₂CH₂CH₂NH₂

(d)

17.

Identify the complexs which are expected to be coloured.

(a)

[Ti(NO₃)₄]

(b)

[Cu(NCCH₃)₄]^{+ \({ BF }_{ 4 }^{ - }\)}

(c)

[Cr(NH₃)₆]³⁺ 3Cl^-

(d)

K₃[VF₆]

18.

Fac-Mer isomerism is associated with which one of the following complexes? (M=central metal)

(a)

[M(AA)₂]

(b)

[MA₃B₃]

(c)

[M(AA)₃]

(d)

[MABCD]

(e)

[MA₄B₂]

19.

The metal-carbon bond in metal carbonyls possesses

(a)

only \(\sigma \) character

(b)

only \(\pi \) character

(c)

both \(\sigma \) and \(\pi \) character

(d)

ionic character

20.

The hybridisation of Fe in K₄[Fe(CN)₆] is

(a)

dsp²

(b)

sp³

(c)

d²sp³

(d)

sp³d²

Assertion and reason

20 x 1 = 20

21.

Assertion : [Fe(CN)₆]^3– is weakly paramagnetic while [Fe(CN)₆]^4– is diamagnetic.
Reason : [Fe(CN)₆]^3– has +3 oxidation state while [Fe(CN)₆]^4– has +2 oxidation state.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

22.

Assertion : NF₃ is a weaker ligand than N(CH₃)₃.
Reason : NF₃ ionizes to give F^– ions in aqueous solution.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

23.

Assertion : Haemoglobin is a globular protein.
Reason : Globular proteins are insoluble in water.
Codes:
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.

24.

Assertion : Amino acids are insoluble in benzene and ether.
Reason : Amino acids exist as zwitter ions.
Codes:
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.

25.

Assertion : DNA undergoes replication.
Reason : DNA contains cytosine and thymine as pyrimidine bases.
Codes:
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.

26.

Assertion : Amines are basic in nature.
Reason : Amines have lone pair of electrons on nitrogen atom.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

27.

Assertion : Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
Reason : FeCl₂ formed gets hydrolysed to release HCl during the reaction.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

28.

Assertion (A) : [Ni(CN)₄]^2-is is square planar and diamagnetic.
Reason (R) : It has no unpaired electrons due to presence of strong field ligand.
(a) Both (A) and (R) are correct but (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c) (A) is correct but (R) is incorrect.
(d) (A) is incorrect but (R) is correct.

29.

Assertion (A) : trans [CrCl₂(Ox)₂]^3- shows optical isomerism.
Reason (R) : Optical isomerism is common in octahedral complexes involving didentate ligands.
(a) Both (A) and (R) are correct but (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c) (A) is correct but (R) is incorrect.
(d) (A) is incorrect but (R) is correct.

30.

Assertion: Vitamin D can be stored in our body.
Reason: Vitamin D is fat soluble vitamin.
Codes:
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct but reason is wrong statement.
(d) Assertion is wrong but reason is correct statement.
(e) Assertion and reason both are correct statements but reason is not correct explanation of assertion.

31.

Assertion: Glucose gives a reddish-brown precipitate with Fehling's solution.
Reason: Reaction of glucose with Fehling's solution gives CuO and gluconic acid.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

32.

Assertion: DNA has a double helix structure.
Reason: The two strands in a DNA molecule are exactly similar.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

33.

Assertion: Ortho substituted anilines are usually weaker bases than anilines.
Reason: This is due to ortho effect.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

34.

Assertion: Controlled nitration of aniline at low temperature mainly gives m-nitroaniline.
Reason: In acidic medium, -NH₂ group gets converted into m-directing group.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

35.

Assertion: Boiling point of amines are lower than those of alcohols and carboxylic acids.
Reason: Amines are much more soluble in water than less polar solvents like alcohol, ether, etc.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

36.

Assertion: The second and third transition series elements have lesser tendency to form low spin complex as compared to the first transition series.
Reason: The CFSE (\(\Delta\)_o) is more for 5d and 4d.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

37.

Assertion: Aqueous solution of potassium ferrocyanide does not give the test of iron (II).
Reason: Potassium ferrocyanide is not poisonous like potassium cyanide.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement

38.

Assertion: [Ni(CN)₄]^2- has square planar and [NiCl₄]^2- has tetrahedral shape.
Reason: [Ni(CN)₄]^2- is diamagnetic while [NiCl₄]^2- is paramagnetic.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement

39.

Assertion: Low spin complexes have less number of unpaired electrons.
Reason: [FeF₆]^3- is a low spin complex.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

40.

In the following questions. an Assertion (A) is followed by a corresponding Reason (R) Use the following keys to choose the appropriate answer.
Assertion (A) Acylation of amines gives a monosubstituted product, whereas alkylation of amines gives polysubstituted product.
Reason (R) Acyl group sterically hinders the approach of further acyl groups.
Codes:
(a) Both (A) and (R) are correct, (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct, (R) is not the correct explanation of (A).
(c) (A) is correct; (R) is incorrect.
(d) (A) is incorrect; (R) is correct.

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Answers Key:

Multiple Choice Question

20 x 1 = 20

(d)
pH does not affect the primary structure of protein.

(b)
N-Methyl ethanamide

(b)
3AgCl, 2AgCl, 1AgCl

(b)
Hexacyanido ferrate (III) ion

(a)
Vitamin A

(b)
Only \(\alpha\)-amino acids

(a)
tetrahedral

10.

(b)
I > III > II

11.

A strongest base has the smallest pK_b, i.e. option (b) is correct.

12.

13.

(a)
primary structure of proteins

14.

Sulphonilic acid exists as a zwitterion.

15.

Isopropylamine, i.e., (CH)CH-NH is a \({ 1 }^{ \circ }\) amine.

16.

(b)
NH\(^+_4\)

17.

18.

(b)
[MA₃B₃]

19.

20.

Assertion and reason

20 x 1 = 20

21.

(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

22.

23.

C) Assertion is correct statement but reason is wrong statement.
Explanation:
Globular proteins have weak intermolecular forces of attraction and hence they are soluble in water.

24.

B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

25.

B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Explanation:
The genetic information of the cell is contained in the sequence of base A, T, G and C in DNA molecule when a cell divides, DNA molecules replicate and make exact copies of themselves so that each daughter cell will have DNA identical to that of the parent cell.

26.

(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Explanation:
Amines are basic due to the presence of a lone pair of electrons on nitrogen atom. The lone pair can be easily donated.

27.

(d) If both the Assertion and Reason are incorrect.

28.

(a) Both (A) and (R) are correct but (R) is the correct explanation of (A).

29.

(d) (A) is incorrect but (R) is correct.
(d) Reason is correct but Assertion is incorrect. Trans [CrCl₂(Ox)₂]^3- does not show optical isomerism

30.

(a) Assertion and reason both are correct and reason is correct explanation of assertion.

31.

32.

(c): The two strands in a DNA molecule are not exactly similar but are complimentary.

33.

(a): Ortho effect is a consequence of steric and electronic factors.

34.

(a): Under acidic condition, aniline gets protonated to anilinium ion (-NH₃⁺ group). This is deactivating and m-directing group. Thus, controlled nitration of aniline mainly gives m-nitroaniline.

35.

(b): It is because hydrogen bonding is less pronounced in primary and secondary amines than that in alcohols or carboxylic acids and nitrogen is less electronegative than oxygen

36.

(d) : 4d and 5d elements have greater tendency to form low spin complex (allows better pairing of electrons) in comparison to 3d because the difference in energy of t_2g and e_g (CFSE, \(\Delta\)_o) increases in 4d and Sd.

37.

(b): Being a complex salt, potassium ferrocyanide ionises to 4K⁺ and [Fe(CN)₆]^4- ions. Absence of Fe(II) does not give the test of iron.

38.

(b): In [NiCl₄]^2-, the cr ligands present in the complex ion are less basic than CN^-, as such no pairing of electrons in the 3d-subshell takes place. This results in sp³ hybridisation and the complex so formed is tetrahedral. On the other hand, in caseof [Ni(CN)₄]^2-, the CN^- ligands present in the complex ion are more basic than cr. as such pairing of electrons can take place in the 3d-subshell. Due to pairing of electrons in 3d-subshell, one of the d-orbital becomes vacant. This results in dsp² hybridisation and the complex so formed is square planar and diamagnetic.

39.

(c): [FeF₆]^3- is a high spin complex since F^- is a weak field ligand.

40.

(c) Acylation of amine gives a mono substituted product whereas alkylation of amine gives polysubstituted product because acylation in amine takes place at N-atom and alkylation takes place at o-and p-position. Hence, (A) is correct but (R) is incorrect.