Question:
The property of the alkaline earth metals which increases with their atomic number is
The property of the alkaline earth metals which increases with their atomic number is
Show Hint
For group 2, solubility of hydroxides increases while solubility of sulfates decreases down the group.
Updated On: Apr 16, 2026
- Ionisation energy
- Electronegativity
- Solubility of their hydroxides in water
- Solubility of their sulphates in water
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Trends in properties of alkaline earth metals (Group 2) down the group.
Step 2: Detailed Explanation:
• (A) Ionisation energy: Decreases down the group as atomic size increases. • (B) Electronegativity: Decreases down the group. • (C) Solubility of hydroxides: Increases down the group. Be(OH)\(_2\) is insoluble, Mg(OH)\(_2\) is sparingly soluble, while Ca(OH)\(_2\), Sr(OH)\(_2\), and Ba(OH)\(_2\) are increasingly soluble. This is due to the decreasing lattice energy and increasing hydration energy down the group. • (D) Solubility of sulphates: Decreases down the group. BeSO\(_4\) and MgSO\(_4\) are soluble, while CaSO\(_4\), SrSO\(_4\), and BaSO\(_4\) are increasingly insoluble.
Step 3: Final Answer:
Solubility of hydroxides increases down the group, which corresponds to option (C).
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