Home Chemistry D and F - Block Elements General CuSO4.5H2O is blue in colour because
Chemistry D and F - Block Elements General Single Correct MCQ
Published on: August 12, 2026

CuSO4.5H2O is blue in colour because

A
It contains water of crystallization.
B
SO42– ions absorb red light.
C
Cu2+ ions absorb red light.
D
Cu2+ ions absorb all colours except red from the white light.

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Text Solution

Verified by Experts
The correct answer is:
C

Cu2+ ion (3d9) absorbs red light from the visible region, for the promotion of 3d electrons, the ions reflect blue light and appear blue.

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