The correct sequence of increasing melting points of $B e C l_{2}, M g C l_{2}, C a C l_{2}, S r C l_{4}, a n d B a C l_{2}$ is :

B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}

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B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2}

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B e C l_{2} < C a C l_{2} < M g C l_{2} < S r C l_{2} < B a C l_{2}

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M g C l_{2} < B e C l_{2} < S r C l_{2} < C a C l_{2} < B a C l_{2}

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Solution

The correct option is A $B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2}$
As size of cation increase increases, the ionic character of the compound increases hence the melting point.
Hence, option B is correct

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