Q42Short answer
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.
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X — Na, Y — NaOH, Z — H2 2Na + 2H2O → 2NaOH + H2 + Heat energy