Assertion (A): Highest oxidation state of Mn ...

CBSE Class 12 Chemistry 2026 All Sets Solved Paper

Question : 14 of 16

Marks: +1, -0

Assertion (A): Highest oxidation state of Mn is +7 in most of the transition elements.

Reason (R): Transition metals exhibit variable oxidation states.

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

Solution:

Assertion (A):

“Highest oxidation state of Mn is +7 in most of the transition elements.”

This is false.

While Manganese does show a maximum oxidation state of +7 (e.g., in permanganate), this is not true for most transition elements.

Many transition metals show maximum oxidation states different from +7.

Some even exceed +7 (e.g., Ru and Os can reach +8).

So the statement is incorrect.

Reason (R):

“Transition metals exhibit variable oxidation states.”

This is true.

This happens because:

(n–1)d and ns orbitals have comparable energies.

Both can participate in bonding.

Since Assertion is false but Reason is true.

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