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Question

Consider the following reaction, 2M+12O2M2O (M = alkali metal). Select the correct statement.

A
M can be Li and Na
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B
M can be Cs and Rb
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C
M can be Li and Rb
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D
None of the above
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Solution

The correct option is A M can be Li and Na
On reaction with oxygen, lithium forms monoxide (Li2O).
4Li(s)+O2(g)2Li2O(s)
and sodium,
4Na(s)+O2(g)2Na2O(s)
The other alkali metals (K,Rb,Cs,Fr) form superoxide compounds (in which oxygen takes the form O2) as the principal combustion products. The following equation shows the formation of superoxide, where M represents K,Rb,Cs, or Fr
M(s)+O2(g)MO2(s)

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