Which of the following statements are correct | vedclass

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(B) $(i)$ The alkali metal superoxides contain $O_2^{-}$ ion,which has an unpaired electron,hence they are paramagnetic in nature. This statement is c

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$(i)$ and $(ii)$ only

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(B) $(i)$ The alkali metal superoxides contain $O_2^{-}$ ion,which has an unpaired electron,hence they are paramagnetic in nature. This statement is correct.$(ii)$ The basic character of alkali metal hydroxides increases on moving down the group due to the increase in electropositive character. This statement is correct.$(iii)$ The conductivity of alkali metal chlorides in their aqueous solution increases on moving down the group. As the size of the alkali metal ion increases,the degree of hydration decreases,which increases the ionic mobility. This statement is incorrect.$(iv)$ The basic nature of carbonates in aqueous solution is due to anionic hydrolysis of the $CO_3^{2-}$ ion: $CO_3^{2-} + H_2O \rightleftharpoons HCO_3^{-} + OH^{-}$. This statement is incorrect.

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