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JEE Main levelSingle correct optionDifficulty 2 of 3sb033

Calcium hydride reacts with heavy water. Which gas is evolved?

A $HD$
B $H X_{2}$
C $D X_{2}$
Da mixture of $D X_{2}$ and $O X_{2}$

Answer: A

The hydride ion (

H X^{-}

) takes a deuteron from

D X_{2} O

, so each hydrogen molecule has one H from the hydride and one D from the water.

CaH X_{2} + 2 D X_{2} O Ca (OD) X_{2} + 2 HD

, so the gas is

HD

.

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