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Which of the following statements are correct? (A) Both LiCl and MgCl2 are soluble in ethanol. (B) The oxides Li2O and MgO combine with excess of oxygen to give superoxide. (C) LiF is less soluble in water than other alkali metal fluorides. (D) Li2O is more soluble in water than other alkali metal oxides. Choose the most appropriate answer from the options given below: (1) (A) and (C) only (2) (A), (C) and (D) only (3) (B) and (C) only (4) (A) and (D) only

1. (A) and (C) only
2. (A), (C) and (D) only
3. (B) and (C) only
4. (A) and (D) only

Correct answer: (A) and (C) only

Solution

(A) LiCl and MgCl2 are covalent enough to dissolve in ethanol - true. (C) LiF has very high lattice energy and is only sparingly soluble - true. (B) Li and Mg form normal oxides, not superoxides - false. (D) Li2O is the least soluble alkali metal oxide, not the most - false. So (A) and (C) only.

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