The formula of hydride of the halogen in period 3 is:

H C l_{2}

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H C l_{3}

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H_{2} C l_{4}

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H C l

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Solution

The correct option is D $H C l$
The halogen of the third period is $C l$ . It is a monovalent element.
Thus, the chemical formula of a hydride of $C l$ is $H C l$ .

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The hydride of oxygen is H2O but the hydride of Chlorine is HCl. Give reasons.

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