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Explain why: (a) Lithium on being heat...

Explain why:
(a) Lithium on being heated in air mainly forms the monoxide and not peroxide.
(b) An aqueous solution of sodium carbonate gives alkaline test.

Text Solution

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a. `Li^(o+)` ion is very small in size. It is stabilised more by smaller anion, i.e. oxide ion `(O^(2-))` as compared to peroxide ion `(O_(2)^(2-))` .
b. An aquous solution of sodium carbonate gives alkaline tests because `Na_(2)CO_(3)` undergoes hydrolysis.
`Na_(2)CO_(3)+H_(2)O rarr NaHCO_(3)+NaOH`
or
`CO_(3)^(2-)+H_(2)O rarr HCO_(3)^(Θ)+ .^(Θ)OH`
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