A) K and $ KO_2 $
B) Ca and $ CaH_2 $
C) Na and $ Na_2O_2 $
D) Ba and $ BaO_2 $
Correct Answer: B
[b] $ Ca+2H_2O\to Ca{{(OH)}_2}+H_2 $
$ CaH_2+2H_2O\to Ca{{(OH)}_2}+H_2 $
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