Question

Select correct statement(s)

• A. Stability of peroxides and superoxides of alkali metals increases with increase in size of the cation
• B. Increase in stability in (1) is due to stabilisation of large anions by larger cations through lattice energy effects
• C. The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy
• D. NaOH does not form hydrated salt

Answer 1

Answer: (A)

Stability of peroxides and superoxides of alkali metals increases with increase in size of the cation

Answer 2

(1) The increasing stability of the peroxide or superoxide, as the size of the metal ion increases, is due to the stabilisation of large anions by larger cation through lattice energy effects.

(2) Bigger cation stabilises bigger anion and similarly smaller cation stabilises smaller anion through lattice energy effects.

(3) The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.

(4) NaOH is deliquescent in nature. So, NaOH absorbs moisture.