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Which of the following orders is incorrect? (A) Thermal stability: LiNO3 < NaNO3 < KNO3 (B) Solubility: LiNO3 < NaNO3 < KNO3 (C) Thermal stability: Be(OH)2 < Ca(OH)2 < Sr(OH)2 (D) Solubility: Be(OH)2 < Ca(OH)2 < Sr(OH)2

1. Thermal stability: LiNO3 < NaNO3 < KNO3
2. Solubility: LiNO3 < NaNO3 < KNO3
3. Thermal stability: Be(OH)2 < Ca(OH)2 < Sr(OH)2
4. Solubility: Be(OH)2 < Ca(OH)2 < Sr(OH)2

Correct answer: Solubility: LiNO3 < NaNO3 < KNO3

Solution

Thermal stability of Group 1 nitrates increases down the group (A is correct). For solubility, LiNO3 is highly soluble due to anomalous behaviour of Li (high hydration energy), so the order LiNO3 < NaNO3 < KNO3 is incorrect. Group 2 hydroxide thermal stability and solubility both increase down the group (C and D are correct). Thus the incorrect order is (B).

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