Exams › JEE Advanced › Chemistry
Which of the following statements about alkali metal compounds are correct? (A) The thermal stability of peroxides and superoxides of alkali metals increases as the cation size increases from Li to Cs. (B) The increasing stability described in (A) arises because larger cations better stabilize large anions through more favorable lattice energy. (C) The low aqueous solubility of LiF is due to its very high lattice energy, while the low solubility of CsI is due to the small hydration energy of its ions. (D) NaOH is not deliquescent.
- A and B only
- A, B and C
- A, B, C and D
- B and C only
Correct answer: A, B and C
Solution
Statements A, B, and C are all correct. Peroxides and superoxides are stabilized by larger cations due to lattice energy matching. LiF has anomalously high lattice energy; CsI has low hydration energy. NaOH is in fact deliquescent, so statement D is false.
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