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A metal on combustion in excess air forms X. X upon hydrolysis with water yields H2O2 and O2 along with another product. The metal is : (1) Rb (2) Li (3) Mg (4) Na

Answer»

The correct option (1) Rb   

Explanation:

Rb(s) + O2(g)  RbO2(s)

2RbO2(s) + 2H2O(l)  2RbOH + H2O2 + O2

On combustion in excess of air, lithium forms mainly the oxide, Li2O, Sodium form the peroxide Na2O2 whilst K, Rb, Cs form the superoxides MO2.



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