A) Li
B) Rb
C) Mg
D) Na
Correct Answer: B
Solution :
K, Rb and Cs form super oxides on reaction with excess air. \[Rb+{{O}_{2}}\to Rb{{O}_{2}}\] \[2Rb{{O}_{2}}+2{{H}_{2}}O\to 2RbOH+{{H}_{2}}{{O}_{2}}+{{O}_{2}}\uparrow \]
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