Assertion (A) : [Cr(H_2O)_6]Cl_2 and [Fe(H_2O)_6]Cl_2 are examples of homoleptic complexes. Reason (R) : All the ligands attached to the metal are the same. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

ChemistryCBSE Class 12 · Board exam 2025, set 56/1/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2025: question 13

Set in the CBSE Class 12 board exam of 2025, paper 56/1/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedCoordination Compounds

Assertion (A) : $[Cr (H_{2} O)_{6}] C l_{2}$ and $[Fe (H_{2} O)_{6}] C l_{2}$ are examples of homoleptic complexes.
Reason (R) : All the ligands attached to the metal are the same.

(A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(C)Assertion (A) is true, but Reason (R) is false.
(D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 56/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Look at which ligands are inside the coordination sphere.

Hint 2

Recall the definition of a homoleptic complex.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

In both complexes only $H_{2} O$ ligands are bonded to the metal, so both are homoleptic. The assertion is true.
Having only one kind of ligand is exactly the definition of a homoleptic complex, so R is true and correctly explains A. The answer is option (A).
1 mark

Answer: Option (A)

Where the marks are

Recognises both A and R are true and R explains A (1 mark)

Revise the chapter

Chapter: Coordination Compounds (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Coordination Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 56/1/1: every question, by section.

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CBSE Class 12 Chemistry 2025: question 13

Hints

Step-by-step solution

Revise the chapter

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