(D) Hydrogen gas can be produced by the reaction of water with active metals and metal hydrides.$1$. Reaction with metals: $Mg + 2 H_2O \to Mg(OH)_2 +

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(D) Hydrogen gas can be produced by the reaction of water with active metals and metal hydrides.$1$. Reaction with metals: $Mg + 2 H_2O \to Mg(OH)_2 + H_2 \uparrow$$2$. Reaction with metal hydrides: $LiH + H_2O \to LiOH + H_2 \uparrow$Therefore,both $(a)$ and $(c)$ are correct.