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Q.

 Assertion(A) : The  highest oxidation state osmium ‘+8’ 
Reason (R):    Osmium is a  5dblock  element
 

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a

Both (A) and (R)  are true  but (R) is not correct explanation of(A)

b

Both (A)  and (R) are true and the (R) is the correct explanation of the (A)

c

(A)  is not ture but (R) is true

d

Both (A) and (R) are false

answer is B.

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Detailed Solution

The highest oxidation state is osmium. Osmium is a  5dblock  element
 

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