Which of the following covalent compounds become electrovalent when dissolved in water?

Ozone

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Methane

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Hydrogen chloride

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Hydrogen dioxide

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Solution

The correct option is C
Hydrogen chloride

Hydrogen chloride is covalently bonded as a gas at room temperature. This means there are no ions. Particularly, there are no H⁺ ions - which are the ions that make a substance acidic but when hydrogen chloride dissolves in water is dissociates - it splits up into H⁺ ions and Cl^- ions. Hence, when dissolved in water, HCl becomes electrovalent.

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