Question

Assertion: $$[\mathrm{Fe}(\mathrm{CN}){\phantom{A}}_6]{\phantom{A}}^{3-}$$ ion shows magnetic moment corresponding to two unpaired electrons.

Reason: Because it has d²sp³ type hybridisation.

Options

• Assertion and reason both are true, reason is correct explanation of assertion.

• Assertion and reason both are true but reason is not the correct explanation of assertion.

• Assertion is true, reason is false.

• Assertion is false, reason is true.

Answer 1

Assertion is false, reason is true.

Explanation:

The assertion, "$$\mathrm{Fe}(\mathrm{CN}){\phantom{A}}_6]{\phantom{A}}^{3-}$$ ion shows magnetic moment corresponding to two unpaired electron" is false as it contains only one unpaired electron only d²sp³ hybridisation, which cannot be regarded as a true reason for its weak paramagnetic behaviour.