JEE PYQ: S Block Elements Question 21
Question 21 - 2020 (09 Jan Shift 2)
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 $\text{H}_2\text{O}$.
(a) (A), (B) and (D) only (b) (A), (C) and (D) only (c) (B) and (D) only (d) (A) and (D) only
Show Answer
Answer: (d)
Solution
LiCl is soluble in pyridine (B is wrong). Lithium can form ethynide $\text{Li}_2\text{C}_2$ (C is wrong). Lithium has the highest hydration enthalpy among the alkali metals (A is correct). Both lithium and magnesium react slowly with $\text{H}_2\text{O}$ (D is correct).
BETA
