Assertion : $[F e (C N)_{6}]^{3 -}$ has $d^{2} s p^{3}$ type hybridisation. Reason: $[F e (C N)_{6}]^{3 -}$ ion shows magnetic moment corresponding to two unpaired electrons.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$[F e (C N)_{6}]^{3 -}$ has $d^{2} s p^{3}$ type hybridisation. Inner d orbital is used. Hence, the complex is inner orbital complex.
$[F e (C N)_{6}]^{3 -}$ ion shows magnetic moment corresponding to one unpaired electron.
$F e^{3 +}$ ion has $3 d^{5}$ as outer electronic configuration. All five d electrons are in lower $t_{2 g}$ energy level.
Assertion is correct but Reason is incorrect.

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Similar questions

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) $[F e (C N)_{6}]^{3 -}$ ion shows magnetic moment corresponding to two unpaired electrons.
Reason (R) Because it has $d^{2} s p^{3}$ type hybridisation.