Covalent bond is present in:

N a_{2} S

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A l C l_{3}

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N a H

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K_{2} O

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Solution

The correct option is B $A l C l_{3}$
$N a_{2} S$ consists of $2 N a^{+}$ and $S^{- 2}$ . It is an ionic compound.
$N a H$ consists of $N a^{+} H^{-}$ . It is an ionic compound.
$K_{2} O$ consists of $2 K^{+}$ and $O^{2 -}$ . It is an ionic compound.
$A l C l_{3}$ is a purely covalent compound. It does not contain ions.

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A l C l_{3}

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$N a_{2} S + 2 H C l \to 2 N a C l +$ ______

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