State as to why
(i) An aqueous solution of `Na_(2)CO_(3)` is alkaline.

Explanation

i) AN aqueous solution of `Na_2CO_3` is alkaline. This is due to anionic `(CO_3^(2-))` hydrolysis
`CO_3^(2-) +H_2O to HCO_3^(-)+OH^-`
`therefore PH gt 7` so the solution is alkaline in nature
(ii) Chemically alkali metals are highly reactive and they are placed at top in the electro chemical series.
`therefore` Common methods of extraction of the metals are not applicable for the alkali metals, So electrolytic reduction of their used chlorides is the possible method for extracting alkali metals.
Eg: Na metal obtained form fused.NaCl.