A) K and\[K{{O}_{2}}\]
B) Ca and\[Ca{{H}_{2}}\]
C) Na and\[N{{a}_{2}}{{O}_{2}}\]
D) Ba and\[Ba{{O}_{2}}\]
Correct Answer: B
Solution :
\[Ca+2{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}+{{H}_{2}}\] \[Ca{{H}_{2}}+2{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}+{{H}_{2}}\]
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