For the following transformation, the reagent used is:

L i A l H_{4}

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H_{3} P O_{2}

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H_{3} O^{+}

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H_{2} / P t

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Solution

The correct option is B $H_{3} P O_{2}$
$H_{3} P O_{2}$ is the reagent that converts $N_{2}^{+} C l^{-}$ group into H. During this process $N_{2}$ and $H C l$ gases are released.

The general reaction is as follows:
The reaction is as follows:

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