A) K and \[K{{O}_{2}}\]
B) Na and \[N{{a}_{2}}{{O}_{2}}\]
C) \[Ca\] and \[Ca{{H}_{2}}\]
D) \[Ba\] and \[Ba{{O}_{2}}\]
Correct Answer: C
Solution :
\[Ca+2{{H}_{2}}O\xrightarrow{\,}\,Ca{{(OH)}_{2}}+{{H}_{2}}\] \[Ca{{H}_{2}}+2{{H}_{2}}O\xrightarrow{\,}\,Ca{{(OH)}_{2}}+2{{H}_{2}}\]whereas K, Na and \[Ba\] give \[{{H}_{2}}\] gas and \[N{{a}_{2}}{{O}_{2}}\] and \[Ba{{O}_{2}}\], give hydrogen peroxide, \[K{{O}_{2}}\] gives \[{{O}_{2}}\] and \[{{H}_{2}}{{O}_{2}}\] on reaction with water.
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