Which of the following statement (s) is/are correct ?

Chemistry D and F - Block Elements General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

S 2 O 8 2– oxidises Mn 2+ to give pink colour.

MnO 4 2– disproportionates to yield MnO 4 – and MnO 2 in presence of H + ions.

In Cr 2 O 7 2– each Cr is linked to four oxygen atoms.

Ti 3+ is purple while Ti 4+ is colourless.

Text Solution

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The correct answer is:

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(a,b,c,d)

Mn +2 + S 2 O 8 2– ⎯→ MnO 4 – + 2SO 4 2–

3MnO 4 2– + 4H + ⎯→ 2MnO 4 – + MnO 2 + 2H 2 O.

Ti 3+ has one unpaired electrons; So d-d transition is possible while Ti 4+ has no electrons in d-orbitals.

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