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Which of the following facts is corrects?

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The complex ${[{BeF}_{4}]}^{2 -}$ is stable while ${[{MgF}_{4}]}^{2 -}$ is not observed

The complex ${[{MgF}_{4}]}^{2 -}$ is stable while ${[{BeF}_{4}]}^{2 -}$ is not observed

Both ${[{BeF}_{4}]}^{2 -}$ and ${[{MgF}_{4}]}^{2 -}$ are not observed

Both ${[{BeF}_{4}]}^{2 -}$ and ${[{MgF}_{4}]}^{2 -}$ are stable

answer is A.

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Detailed Solution

${Be}^{2 +}$ has large charge density due to its smaller size. Thus The complex ${[{BeF}_{4}]}^{2 -}$ is stable while ${[{MgF}_{4}]}^{2 -}$ is not observed.

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