Q51 / 180 · AIIMS 2018 (27 May) · Chemistry

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

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

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.

Hence, the correct answer is option: 'B'.

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