Question:
The correct order of thermal stability of hydroxides is:
The correct order of thermal stability of hydroxides is:
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The thermal stability of hydroxides increases as the cation size decreases, leading to higher lattice energy.
Updated On: Nov 26, 2025
- \( {Ba(OH)}_2 < {Ca(OH)}_2 < {Sr(OH)}_2 < {Mg(OH)}_2 \)
- \( {Mg(OH)}_2 < {Sr(OH)}_2 < {Ca(OH)}_2 < {Ba(OH)}_2 \)
- \( {Mg(OH)}_2 < {Ca(OH)}_2 < {Sr(OH)}_2 < {Ba(OH)}_2 \)
- \( {Ba(OH)}_2 < {Sr(OH)}_2 < {Ca(OH)}_2 < {Mg(OH)}_2 \)
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The Correct Option is D
Solution and Explanation
Step 1: Thermal stability of hydroxides generally increases as we go up the group in the periodic table.
Step 2: In alkaline earth metal hydroxides, the thermal stability increases as the metal cation becomes smaller and more highly charged. This is because the lattice energy increases with smaller cations, making the hydroxide more stable.
Step 3: Therefore, the correct order of thermal stability is: \[ {Ba(OH)}_2 < {Sr(OH)}_2 < {Ca(OH)}_2 < {Mg(OH)}_2. \]
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