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Which of the following compound(s) liberate gas on reaction with water?
With water, $$\text{Mg}_3\text{N}_2$$ gives ammonia, $$\text{CaC}_2$$ gives acetylene, $$\text{CaH}_2$$ gives hydrogen and $$\text{Ca}_3\text{P}_2$$ gives phosphine. All four liberate a gas, so options a, b, c and d are all correct.
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