Which of the following cannot conduct electricity in a fused state?

M g C l_{2}

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C a C l_{2}

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B a C l_{2}

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B e C l_{2}

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Solution

The correct option is D $B e C l_{2}$
In fused state, ionic compounds have free cations and anions which can move easily to conduct electricity. $M g C l_{2}$ , $C a C l_{2}$ and $B a C l_{2}$ are ionic in nature. So, they can conduct electricity.
However, $B e C l_{2}$ has a covalent character due to small size of beryllium. In a fused state, $B e C l_{2}$ exists in polymeric state. So, it does not have free ions to conduct electricity.

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