In which of the following cases, the covalent character and the melting point order are same?

B e C l_{2}

C a C l_{2}

B a C l_{2}

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N a C l

M g C l_{2}

A l C l_{3}

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M g B r_{2}

S r B r_{2}

B a B r_{2}

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N a F

M g F_{2}

A l F_{3}

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Solution

The correct option is B $N a F$ , $M g F_{2}$ , $A l F_{3}$
$N a F$ , $M g F_{2}$ , $A l F_{3}$
Here both covalent character and the melting point increases. As per Fajan's Rule, smaller the cation and higher charge value favour covalent character. Also, melting point increases with ion-ion interaction, which are function of d, the distance between the ions and q, charge on the ions.
$F α \frac{q_{1} q_{2}}{r^{2}}$

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Similar questions

R a C l_{2} < 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}

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} < R a C l_{2}

R a C l_{2} < 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}

R a C l_{2} < 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}

A l F_{3}

A l C l_{3}

M g C l_{2}

B e C l_{2}

N a C l, M g C l_{2}, A l C l_{3}

N a C l, M g {C l}_{2}, A l {C l}_{3}

A l {C l}_{3} < M g {C l}_{2} < N a C l

N a F, M g F_{2}

A l F_{3}

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