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Assertion (A) : The highest oxidation st...

Assertion (A) : The highest oxidation state of osmium is +8.
Reason (R ) : Osmium is a 5d - block element.

A

both (A) and (R ) are true, and (R ) is the correct explanation of (A).

B

both (A) and (R ) are true, but (R ) is not the correct explanation of (A).

C

(A) is false but (R ) is true.

D

(A) and (R ) both are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct Explanation : All of the eight valence electrons of osmium `(5d^(6)6s^(2))` can participate in bonding, because 5d and 6s - electrons have nearly the same energy.
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