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  4. Which of the following pairs of substances gives same gaseous product on reaction with water?

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Q. Which of the following pairs of substances gives same gaseous product on reaction with water?

Hydrogen

Solution:

$Ca+2H_{2}O \to Ca\left(OH\right)_{2}+H_{2}$
$CaH_{2}+2H_{2}O \to Ca\left(OH\right)_{2}+2H_{2}$