In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are true, reason is correct explanation of assertion.
(b) Assertion and reason both are true but reason is not the correct explanation of assertion.
(c) Assertion is true, reason is false.
(d) Assertion is false, reason is true.

Assertion (A) $[C r (H_{2} O_{6})] C l_{2}$ and $[F e (H_{2} O)_{6}] C l_{2}$ are reducing in nature.
Reason (R) Unpaired electrons are present in their d-orbitals.

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Solution

Answer (b). Assertion and reason both are true but the reason is not a correct explanation of assertion.
Correct reason is
$[C r (H_{2} O_{6})] C l_{2}$ and $[F e (H_{2} O)_{6}] C l_{2}$ are reducing in nature due to formation of more stable complex ion after gaining of electron. In the complexes, $C o e x i s t s a s C o^{+ 2} a n d F e a s F e^{+ 2}$ . Both of the complexes become stable by oxidation of metal ion to $C o^{+ 3} a n d F e^{+ 3}$

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