The oxidation state of hydrogen in \( \mathrm{CaH}_{2} \) is: (A) \( +1 \) (B) \( -1 \) (C) zero...

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The oxidation state of hydrogen in \( \mathrm{CaH}_{2} \) is:
(A) \( +1 \)
(B) \( -1 \)
(C) zero
(D) \( +2 \)
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