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Among the statements (a) – (d), the correct ones are: (a) Lithium has the highest hydration enthalpy among the alkali metals. (b) Lithium chloride is insoluble in pyridine. (c) Lithium cannot form ethynide upon its reaction with ethyne (d) Both lithium and magnesium react slowly with H2O

1. (1) (a), (b) and (d) only
2. (2) (a) and (d) only
3. (3) (b) and (c) only
4. (4) (a), (c) and (d) only

Correct answer: (4) (a), (c) and (d) only

Solution

(a) Li has the highest hydration enthalpy among alkali metals (smallest cation) - true. (b) LiCl is actually soluble in pyridine (covalent character) - false. (c) Li does not form an ethynide with ethyne - true. (d) By the diagonal relationship both Li and Mg react slowly with water - true. So (a), (c), (d) are correct.

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