Solubility of IIA elements Hydroxides _ the group
Correct answer: B. Increase
- A. Decrease
- B. Increase
- C. Constant
- D. Variable
Explanation
The solubility of IIA elements' hydroxides increases as you move down the group. This is due to the larger ionic sizes of the elements, which result in weaker lattice structures that dissolve more readily in water. The trend follows: Be(OH)2 < Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2. Options A, C, and D are incorrect because they do not accurately describe this trend. Option A incorrectly suggests a decrease, Option C suggests no change, and Option D suggests an inconsistent pattern.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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