Assertion : Metal deficiency defect can be seen in FeO . Reason : Li compound ( LiCl) has pink colour due to F-center.

Correct answer: B. If both assertion and reason are true but reason is not the correct explanation of assertion. In the crystal of FeO , some Fe^ 2+ ions are missing and the loss of positive charge is made up by the presence of the required number of Fe^ 3+ ions. This however causes metal deficiency in the crystal.

AIIMS 201827 May

Exam: AIIMS
Year: 2018
Date: 27 May
Subject: Chemistry
Chapter: Solid State

AIIMS 2018 · 27 May · Chemistry · Solid State

Assertion : Metal deficiency defect can be seen in FeO . Reason :...

Assertion : Metal deficiency defect can be seen in

\mathrm{FeO}

. Reason : Li compound (

\mathrm{LiCl})

has pink colour due to F-center.

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion.
BIf both assertion and reason are true but reason is not the correct explanation of assertion.
CIf assertion is true but reason is false.
DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion.

Step-by-step solution

In the crystal of

\mathrm{FeO}

, some

\mathrm{Fe}^{2+}

ions are missing and the loss of positive charge is made up by the presence of the required number of

\mathrm{Fe}^{3+}

ions. This however causes metal deficiency in the crystal.

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