JEE Main · ChemistryHard

Which of the following statements regarding the solubility and thermal stability of alkaline earth metal carbonates, , is correct?

  1. A.Solubility increases down the group, while thermal stability decreases.
  2. B.Solubility decreases down the group, while thermal stability increases.
  3. C.Both solubility and thermal stability increase down the group.
  4. D.Both solubility and thermal stability decrease down the group.
Show correct answer & step-by-step solution

Correct answer: B — Solubility decreases down the group, while thermal stability increases.

Solution

  1. The solubility of decreases down the group because the hydration energy decreases more rapidly than the lattice energy.
  2. The thermal stability of increases down the group as the electropositive character of the metal increases, making the bond stronger relative to the bond.
  3. Hence the answer is (B).

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