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Q.

Assertion (A) : Transition metals show variable valency.
Reason (R) : Due to a large energy difference between the ns2 and (n – 1) d electrons. 

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a

A and R both are correct and R is the the correct explanation of A

b

A and R both are correct, but R is not   correct explanation of A

c

A is true, but R is false

d

A and R both are false

answer is C.

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Detailed Solution

small energy difference between the ns2 and (n – 1) d electrons. 

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Assertion (A) : Transition metals show variable valency.Reason (R) : Due to a large energy difference between the ns2 and (n – 1) d electrons.