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A metal on combustion in excess air forms X . X upon hydrolysis with water yields H_{2}O_{2}\: \: and\: \: O_{2} along with another product . The metal is :

  • Option 1)

    Li

  • Option 2)

    Na

  • Option 3)

    Mg

  • Option 4)

    Rb

Answers (1)

best_answer

 

Action of air on alkali metals -

Tarnish rapidly when exposed to air, forming oxides, hydroxides and carbonates

- wherein

4M (s)+O{_{2}}(g))\rightarrow 2M_{2}O(s)\\ M{_{}}{_{2}}O (s) +H{_{2}}O (S)\rightarrow 2MOH+CO{_{2}}\rightarrow M{_{2}}CO_{3}(s)+H{_{2}} O (l) (M=alkali\ metal)

As ewe have learned in Alkline easth metal thatK,Rb andCsFrom super oxides on reaction with excess air

Rb+O2\rightarrow RbO_{2}  (excess)

2 RbO_{2}+2H_{2}O\rightharpoonup 2RbOH+H_{2}O_{2}+O_{2}

 


Option 1)

Li

Option 2)

Na

Option 3)

Mg

Option 4)

Rb

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