Which of the following are covalent solid?
A) $A l F_{3}$ B) $A l C l_{3}$ C) $M g C l_{2}$ D) $B e C l_{2}$

A, B

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B, C

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C, D

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B, D

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Solution

The correct option is D B, D
Both Be and Al have strong tendency to form covalent chlorides. Thus $B e C l_{2}$ and $A l C l_{3}$ are covalent solids.

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Similar questions

Q. 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}

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}

Match the entries given in column A with appropriate ones from column B
$\begin{matrix} Column A & Column B (A) Invisible atoms & (a) Rutherford's atomic model (B) Mass of an atom is concentrated at the centre & (b) Dalton's atomic theory (C) Energy levels & (c) Thomson's atomic model (D) Plum pudding model & (d) Bohr's model \end{matrix}$