Which of the following orders of alkaline-earth metal chlorides are correct:
(a) covalent nature : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$
(b) melting point : $B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2} < R a C l_{2}$
(c) lattice energy : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$
(d) thermal stability : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$

a and c only

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b and d only

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a, b and c only

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a, b, c and d

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Solution

The correct option is A a, b, c and d
(a) covalent nature : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$ .As the size of metal atom decreases covalent natute of its halide increases

(b) melting point : $B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2} < R a C l_{2}$ .As the size mass of molecular weight of substance increases the melting point increases

(c) lattice energy : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$ .As the size of metal atom increases lattice energy of its halide increases

(d) thermal stability : $R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$ .As the size of metal atom increases lattice energy of its halide decreases.

Hence option A,B,C and D are correct.

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