Match the List-I with List-II Choose the correct answer from the options given below: List-I Complex ion List-II Calculated spin only magnetic moment (BM) --- --- A. [ Cr ( H 2 O ) 6] 2+ I. 3.87 B. [ Co ( H 2 O ) 6] 2+ II. 5.92 C. [ Cu ( H 2 O ) 6] 2+ III. 4.90 D. [ Mn ( H 2 O ) 6] 2+ IV. 1.73

Chemistry · Coordination Compounds

JEE Main 2026 — 4 April, Morning Shift — Question 59

Match the List-I with List-II Choose the correct answer from the options given below:

List-I Complex ion	List-II Calculated spin only magnetic moment (BM)
A. $[\mathrm{Cr}(\mathrm{H}_2\mathrm{O})_6]^{2+}$	I. 3.87
B. $[\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]^{2+}$	II. 5.92
C. $[\mathrm{Cu}(\mathrm{H}_2\mathrm{O})_6]^{2+}$	III. 4.90
D. $[\mathrm{Mn}(\mathrm{H}_2\mathrm{O})_6]^{2+}$	IV. 1.73

Option A:
A-I, B-III, C-IV, D-II
Option B:
A-II, B-I, C-III, D-IV
Option C:
A-IV, B-II, C-I, D-III
Option D:
A-III, B-I, C-IV, D-II
Correct

Answer: D

Step-by-step solution

$\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \rightarrow 4$ unpaired $\mathrm{e}^{-}$ ; 4.90 BM(III) $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \rightarrow 0$ unpaired $\mathrm{e}^{-} ; 3.87 \mathrm{BM}(\mathrm{I})$ $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \rightarrow 1$ unpaired $\mathrm{e}^{-} ; 1.73 \mathrm{BM}(\mathrm{IV})$ $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \rightarrow 5$ unpaired $\mathrm{e}^{-}$ ; 5.92 BM(II)

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes