Question Set C

cbse 12th Standard Chemistry Coordination Compounds Important Questions And Answers Study Material - QB365

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

Questions:

Multiple Choice Question

20 x 1 = 20

Which of the following complexes is a 'Chelate' complex?

(a)

[CO(NH₃)₆]³⁺

(b)

[Co(en)₃]³⁺

(c)

[Co(NH₃)₄ Cl₂]

(d)

[CoF₆]³⁺

A basic amino acid among the following is

(a)

glycine

(b)

valine

(c)

histidine

(d)

leucine

CO is stronger ligand than Cl^- because

(a)

CO is neutral molecule

(b)

CO has \(\pi\)-bond

(c)

CO is poisonous

(d)

CO is more reactive

Out of the following which one react with NaNO₂ + HCl to form alcohol

(a)

C₆H₅NHCH₃

(b)

(CH₃)₂NH

(c)

CH₃NH₂

(d)

C₆H₅NH

p-Chloroaniline and anilinium hydrochloride can be distinguished by

(a)

Sandmeyer reaction

(b)

NaHCO₃ solution

(c)

AgNO₃ solution

(d)

Carbylamine reaction

The final product in the following reaction sequence \(p-Chloroaniline\overset { { NaNO }_{ 2 }\ /\ HCI }{ \underset { 0-5^{ \circ }C }{ \longrightarrow } } \ ?\ \overset { KCN }{ \longrightarrow } \quad ?\quad \overset { LiAIH_{ 4 } }{ \longrightarrow } ?\)

(a)

p-chlorobenzamide

(b)

p-chlorophenol

(c)

p-chlorobenzylamine

(d)

p-chlorobenzyl alcohol

In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to

(a)

suppress the concentration of free aniline

(b)

suppress the hydrolysis to phenol

(c)

ensure a stochiometric amount of nitous acid

(d)

neutralise the base liberated

Which of the following statements about primary amines is 'False' ?

(a)

Alkylamines are stronger base than ammonia.

(b)

Alkylamines are stronger bases than arylamines

(c)

Alkylamines react with nitrous acid to produce alcohols

(d)

Arylamines react with nitrous acid to produce pheols

Which of the following compounds will not undergo Friedel-Crafts reaction easily?

(a)

Nitrobenzene

(b)

Toluene

(c)

Cumene

(d)

Xylene

10.

Lysine is least soluble in water in the pH range

(a)

3 to 4

(b)

5 to 6

(c)

6 to 7

(d)

8 to 9

11.

Fructose reduces Tollens' reagent due to

(a)

asymmetric carbons

(b)

primary alcoholic group

(c)

secondary alcoholic group

(d)

enolisation of fructose followed by conversion to aldehyde by base

12.

\(\alpha-D(+)-\)glucose and \(\beta-D(+)-\)glucose are

(a)

enatiomers

(b)

conformers

(c)

epimers

(d)

anomers

13.

Which of the following acids is a vitamin ?

(a)

Aspartic acid

(b)

Ascorbic acid

(c)

Adipic acid

(d)

Saccharic acid

14.

Antiserlity vitamin is

(a)

Vitamin D

(b)

Vitamin B group

(c)

Vitamin E

(d)

Vitamin A

15.

Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand.

(a)

It is a neutral ligand

(b)

It is a didentate ligand

(c)

It is a chelating ligand

(d)

It is a unidentate ligand

16.

Which of the following complexes are heteroleptic ?

(a)

\([Cr(NH_3)_6]^{3+}\)

(b)

\([Co(NH_3)_4Cl_2]^+\)

(c)

\([Ni(CN)_4]^{2-}\)

(d)

\([Ni(NH_3)_4Cl_2]\)

17.

Which of the following complexes have tetrahedral shape?

(a)

[Cu(NH₃)₄]²⁺

(b)

[Ni(CO)₄]

(c)

[NiCl₄]^2-

(d)

[Zn(NH₃)₄]²⁺

18.

Platinum dissolves in aqua regia to form

(a)

PtCl₄

(b)

H₂PtCl₆

(c)

Pt(NO₃)₄

(d)

[PtCl₂(NO₃)₂]

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 complexes [Co (NH₃)₆] [Cr (CN)₆] and [Cr(NH₃)₆] [Co(CN)₆] are the examples of which type of isomerism?

(a)

Geometrical isomerism

(b)

Linkage isomerism

(c)

Ionization isomerism

(d)

Coordination isomerism

Assertion and reason

20 x 1 = 20

21.

Assertion : [Ti(H₂O)₆]³⁺ is coloured while [Sc(H₂O)₆]³⁺ is colourless.
Reason : d-d transition is not possible in [Sc(H₂O)₆]³⁺.
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 : Cysteine can cross link peptide chains.
Reason : Ammo acids are classified as essential and non-essential amino acids.
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 : 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.

26.

Assertion (A) : Low spin tetrahedral complexes are rarely observed.
Reason (R) : Crystal field splitting energy is less than pairing energy for tetrahedral complexes.
(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.

27.

Assertion (A) \(\beta\)-glycosidic linkage is present in maltose.
Reason (R) Maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.
(a) Both (A) and (R) are correct and (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.

28.

Assertion: Glycine must be taken through diet.
Reason: It is an essential amino acid.
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 statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

29.

Assertion: Uracil occurs in DNA.
Reason: DNA undergoes replication.
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.

30.

Assertion: Tollens' reagent, Benedict's solution and Fehling's solution are reducing agents.
Reason: Mild oxidising agents like chlorine or bromine water convert glucose into 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.

31.

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.

32.

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.

33.

Assertion: In order to convert R-CI to pure R-NH₂ , Gabriel pthalimide synthesis can be used.
Reason: With proper choice of alkyl halides, pthalimide synthesis can be used to prepare 1°,2° or 3° amine.
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: Ethylenediarninetetraacetate ion forms an octahedral complex with the metal ion.
Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
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: All the octahedral complexes of Ni²⁺ must be outer orbital complexes.
Reason: Outer orbital octahedral complexes are given by weak ligands.
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 ligands nitro and nitrito are called ambidentate ligands.
Reason: An ambidentate ligand can attach to metal through two different atoms.
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.

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) Hofmann's bromamide reaction is given by primary amines.
Reason (R) Primary amines are less basic than secondary amines.
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.

38.

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) Benzene diazonium salts are soluble in water.
Reason (R) They are covalent in nature, so they are soluble in water.
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.

39.

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) The total number of isomers shown by \(\begin{equation} \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+} \end{equation}\) complex ion-is three.
Reason (R) \(\begin{equation} \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+} \end{equation}\) complex ion has an octahedral geometry.
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.

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) The stability of \(\begin{equation} \left[\mathrm{Ni}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \end{equation}\) is lower than that of \(\begin{equation} \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2} \end{equation}\)
Reason (R) The geometry of Ni is trigonal bipyramidal in \(\begin{equation} \left[\mathrm{Ni}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \end{equation}\).
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.

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

20 x 1 = 20

(b)
[Co(en)₃]³⁺

(b)
CO has \(\pi\)-bond

Both p-chloroaniline and anilinium hydrochloride are \({ 1 }^{ \circ }\) amines and hence cannot be ditinguished by carbylamine reaction.

To suppress the concentration of free amine otherwaise it will couple with diazonium salt to give the corresponding azo dye.

Arylamines react with NHO₂ to form diazonium salts.

-NO₂ is a powerful dectivating group. It reduces the electron density in the benzene ring considerably. As a result, it does not undergo F.C.reactions.

10.

(d)
8 to 9

11.

(d)
enolisation of fructose followed by conversion to aldehyde by base

12.

(d)
anomers

13.

(b)
Ascorbic acid

14.

15.

(a)
It is a neutral ligand

16.

(b)
\([Co(NH_3)_4Cl_2]^+\)

17.

(b)
[Ni(CO)₄]

18.

(b)
H₂PtCl₆

19.

20.

Assertion and reason

20 x 1 = 20

21.

(a) If both Assertion and Reason are correct and the Reason is 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.
Explanation:
Cysteine can cross link peptide chains through disulphide bridge. Cross linking by disulphide bridge can occur either between the distant, properly oriented parts of the same polypeptide chain (as in oxytocin or vasopressin) or between different polypeptide chains.

25.

(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.

26.

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

27.

(d) (A) is incorrect statement and (R) is correct statement. \(\alpha\)-glycosidic linkage is present in maltose.

Because maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.

28.

(b) Both assertion and reason are wrong statements.
Glycine is not essential amino acid because it is produced in our body, so it may not be part of our diet.

29.

(d): Uracil occurs in RNA.

30.

(d): Benedict's solution, Tollens' reagent, Fehling's solution etc. are mild oxidising agents. They oxidise the aldoses and ketoses to the corresponding acids and get themselves reduced.

31.

(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.

32.

(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

33.

(c): Only primary aliphatic amines can be prepared by Gabriel phthalimide reaction.

34.

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

35.

(b): Ni²⁺ configuration.

During rearrangement only one 3d-orbital may be made available by pairing the electrons. Thus, inner d2sp3 hybridisation is not possible. So, only sp³d²(outer) hybridisation can occur.

36.

(a): When a monodentate ligand has two possible donor atoms and attached in two ways to the central metal atom then that ligand is called ambidentate ligand. This leads to linkage isomerism.

37.

(d) Hofmann's bromamide reaction is given by amide which on reaction with NaOX produces amine having one carbon less than amide. Hence, (A) is not correct but (R) is correct statement.

38.

(c) Benzene diazonium salts are soluble in water because they are ionic in nature. Thus, (A) is correct and R is incorrect.

39.

(b) \(\begin{equation} \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+} \end{equation}\)exist in cis and trans isomers out of which cis isomer will be optically active (cis-d-isomer) and (cis-l-isomer). Both (A) and (R) are correct but (R) is not the correct explanation of (A).

40.

(c) \(\begin{equation} \left[\mathrm{Ni}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \end{equation}\) is more stable than \(\begin{equation} \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2} \end{equation}\), because \(\begin{equation} \left[\mathrm{Ni}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \end{equation}\) is a chelating compound which are more stable than complexes with unidentate ligands as the dissociation of complex involves breaking of two bonds instead of one. \(\begin{equation} \left[\mathrm{Ni}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \end{equation}\)show octahedral geometry with d⁸ configuration. (A) is correct but (R) is incorrect.