Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II. Statement (I) : Dimethyl glyoxime forms a six membered covalent chelate ring when treated with NiCl 2 solution in presence of NH 4 OH . Statement (II) : Prussian blue precipitate contains iron both in (+2) and (+3) oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Chemistry · Coordination Compounds

JEE Main 2024 — 1 February, Shift 2 — Question 76

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement (I) : Dimethyl glyoxime forms a six membered covalent chelate ring when treated with $\mathrm{NiCl}_{2}$ solution in presence of $\mathrm{NH}_{4} \mathrm{OH}$ .

Statement (II) : Prussian blue precipitate contains iron both in $(+2)$ and $(+3)$ oxidation states.

In the light of the above statements, choose the most appropriate answer from the options given below:

Option A:
Statement I is false but Statement II is true
Correct
Option B:
Both Statement I and Statement II are true
Option C:
Both Statement I and Statement II are false
Option D:
Statement I is true but Statement II is false

Answer: A

Step-by-step solution

Statement I is False: Dimethyl glyoxime reacts with $\mathrm{Ni^{2+}}$ ions in the presence of $\mathrm{NH_4OH}$ to form a red, square-planar chelate. Each dimethyl glyoxime ligand forms a five-membered chelate ring with nickel, not a six-membered ring.

Statement II is True: Prussian blue has the composition $\mathrm{Fe_4[Fe(CN)_6]_3 \cdot xH_2O}$ and contains iron in both $+2$ and $+3$ oxidation states.

Thus, Statement I is false but Statement II is true (Option A).

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Exam: JEE Main 2024
Paper: 1 February, Shift 2
Subject: Chemistry
Chapter: Coordination Compounds
Topic: preparation and Uses of Coordination Compounds

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Answer: A

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