Question

Which of the following statements about the sulphate salts of alkali metals is correct?

• A. Except $L{i}_{2}S{O}_4$, all sulphates of other alkali metals are soluble in water.
• B. All sulphate salts of alkali metals except lithium sulphate form alum.
• C. All sulphate salts of alkali metals except lithium sulphate do not decompose at high temperature.
• D. All of the above statements are correct.

Answer 1

The correct option is D All of the above statements are correct.

Due to very small radius, $Li$ shows different behaviour as compared to the other members of the group. All sulphate salts of alkali metals except lithium sulphate form alum. All sulphate salts of alkali metals except lithium sulphate do not decompose at high temperatures. $L{i}_{2}S{O}_4$ is least soluble in water.

Hence, all the given statements are correct.