Which pair of substances gives the same gaseo | vedclass

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Question

(A) For option $A$:$Ca + 2H_2O \rightarrow Ca(OH)_2 + H_2(g)$$CaH_2 + 2H_2O \rightarrow Ca(OH)_2 + 2H_2(g)$Both reactions produce hydrogen gas $(H_2)$

Vedclass · Accepted Answer

$Ca$ and $CaH_2$

Vedclass · Answer

(A) For option $A$:$Ca + 2H_2O \rightarrow Ca(OH)_2 + H_2(g)$$CaH_2 + 2H_2O \rightarrow Ca(OH)_2 + 2H_2(g)$Both reactions produce hydrogen gas $(H_2)$.For option $B$:$2Na + 2H_2O \rightarrow 2NaOH + H_2(g)$$2Na_2O_2 + 2H_2O \rightarrow 4NaOH + O_2(g)$These produce different gases ($H_2$ and $O_2$).For option $C$:$2K + 2H_2O \rightarrow 2KOH + H_2(g)$$2KO_2 + 2H_2O \rightarrow 2KOH + H_2O_2 + O_2(g)$These produce different gases.For option $D$:$Ba + 2H_2O \rightarrow Ba(OH)_2 + H_2(g)$$BaO_2 + 2H_2O \rightarrow Ba(OH)_2 + H_2O_2$These do not produce the same gaseous product.Therefore,the correct pair is $Ca$ and $CaH_2$.

Which pair of substances gives the same gaseous product when they react with water?

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