Question

Assertion (A): Highest oxidation state of Mn is +7 in most of the transition elements.
Reason (R): Transition metals exhibit variable oxidation states.

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

Hint:

Mn shows maximum +7 oxidation state, but not all transition metals do. Variable oxidation state is a general property of transition elements.

Answer 1

The Correct Option is D

Step 1: Analyze Assertion (A). Manganese exhibits a maximum oxidation state of +7 (e.g., in \( KMnO_4 \)). However, the statement says “in most of the transition elements,” which is incorrect because many transition elements do not reach +7 oxidation state. \(\Rightarrow\) Assertion is false.
Step 2: Analyze Reason (R). Transition metals show variable oxidation states due to participation of both \( ns \) and \( (n-1)d \) electrons in bonding. \(\Rightarrow\) Reason is true. \[ \therefore \text{Assertion is false but Reason is true} \]