Match List I with List II. — Solution | JEE Chemistry

MCQMediumJEE 2023Ligands & Coordination Number

Match List I with List II.

Table image showing List I and List II items for a matching question in coordination compounds with four entries each.

Small overlay handle icon from the editor interface, not part of the chemistry question content.

A
(A) - IV, (B) - II, (C) - I, (D) - III
B
(A) - II, (B) - III, (C) - I, (D) - IV
C
(A) - III, (B) - I, (C) - II, (D) - IV
D
(A) - II, (B) - IV, (C) - I, (D) - III

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: A match-the-following question on double salts and coordination compounds.

Find: The correct matching option.

Double salts dissociate completely into their constituent ions in water, whereas coordination compounds do not dissociate fully because they form coordination complexes.

From the solution analysis:

(A) FeSO $4$ · (NH $4$ ) $2$ SO $4$ · $6$ H $2$ O is Mohr's salt, a double salt.
(B) CuSO $4$ · $4$ NH $3$ · H $2$ O is a coordination compound.
(C) K $2$ SO $4$ · Al $2$ (SO $4$ ) $3$ · $24$ H $2$ O is potash alum, a double salt.
(D) Fe(CN) $2$ · $4$ KCN is a coordination compound.

Thus the correct identification corresponds to the matching given in option C.

Therefore, the correct option is C.

Classification Logic

Given: Examples of salts and complexes are to be matched.

Find: Which option correctly classifies them.

The key idea is:

\text{Double salts dissociate completely in water, while coordination compounds retain complex ions.}

Using this:

Mohr's salt = (A) → double salt
CuSO $4$ · $4$ NH $3$ · H $2$ O = (B) → coordination compound
Potash alum = (C) → double salt
Fe(CN) $2$ · $4$ KCN = (D) → coordination compound

So the arrangement matches the one listed under option C.

Therefore, the correct option is C.

Common mistakes

Treating every hydrated salt as a double salt is incorrect because the presence of water of crystallization alone does not decide the classification. Instead, check whether the compound dissociates completely into simple ions in water.
Assuming ammonia-containing compounds are always double salts is wrong. Ligands like NH $3$ often indicate coordination behavior, so identify whether a coordination sphere is formed.
Confusing double salts with coordination compounds leads to wrong matching. A double salt loses its separate identity in solution, while a coordination compound retains complex ions in solution.

Practice more Ligands & Coordination Number questions

Get unlimited AI-adaptive practice, mastery tracking, and an AI tutor that explains every step — free to start.

Start free trial More on Ligands & Coordination Number

Answer

Step-by-step solution

Common mistakes

Practice more Ligands & Coordination Number questions

Related questions