Choose the correct statement(s) among the following (I) LiF is more soluble than LiClO₄ in water. (II) The… · ABC26IN0209
Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR NET 2019 · Marks: 2 · Difficulty: Hard
Choose the correct statement(s) among the following (I) LiF is more soluble than $\mathrm{LiClO_4}$ in water. (II) The standard reduction potential [$E^\circ$] of Li is more negative than that of Na (III) The heat of hydration of $\mathrm{Li^+(g)}$ is greater than that of $\mathrm{Na^+(g)}$
(a)I and II
(b)I and III
(c)II and III
(d)III Only
Answer
Answer (as printed): C
Explanation
• LiF is sparingly soluble in water but for large anions such as ClO4- , the Li+ salts are soluble in water. • Standard reduction potential [E0] of Li is more negative than that of Na. Li+ (aq) + e- →Li (s) [E0]red = -3.04 Na+ (aq) +e- →Na(s) [E0]red = -2.71 •Enthalpy of hydration: Li+ (g) [-520 kJ/mol] > Na+(g)[-406 kJ/mol]
Explanation as extracted from the printed page; notation may be imperfect.