Which pair of substances gives the same gaseo | vedclass

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

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$Ca$ and $CaH_2$

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

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

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