Question

Assertion :$\left[Fe\right(CN{)}_6{]}^{3-}$ has $d^{2}s{p}^3$ type hybridisation. Reason: $\left[Fe\right(CN{)}_6{]}^{3-}$ ion shows magnetic moment corresponding to two unpaired electrons.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

$\left[Fe\right(CN{)}_6{]}^{3-}$ has $d^{2}s{p}^3$ type hybridisation. Inner d orbital is used. Hence, the complex is inner orbital complex.
$\left[Fe\right(CN{)}_6{]}^{3-}$ ion shows magnetic moment corresponding to one unpaired electron.
$F{e}^{3+}$ ion has $3d^5$ as outer electronic configuration. All five d electrons are in lower $t_{2g}$ energy level.
Assertion is correct but Reason is incorrect.