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In which of the following compounds does hydrogen have an oxidation state of `-1 `?

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In which of the following compounds does hydrogen have an oxidation state of `-1 `?
A. `PH_(3)`
B. `NH_(3)`
C. `HCl`
D. `CaH_(2)`
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Correct Answer - d
In `CaH_(2),H` has oxidation state `(-1)[+2+2x=0,x=-1]`
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