Chemistry 5070 · O Level · The characteristic properties of acids and bases

The characteristic properties of acids and bases — practice question

When one mole of compound $X$ is dissolved in water, it produces two moles of ions. $X$ reacts with ammonium carbonate to produce an acidic gas. What is compound $X$?

Acalcium hydroxide
Bethanoic acid
Cnitric acid
Dsodium hydroxide

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