Question:
Which of the following metal carbonate decomposes on heating to evolve CO\(_2\) gas?
Which of the following metal carbonate decomposes on heating to evolve CO\(_2\) gas?
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Lithium shows anomalous behavior among alkali metals due to its small ionic size.
Updated On: Feb 11, 2026
- Li\(_2\)CO\(_3\)
- Cs\(_2\)CO\(_3\)
- K\(_2\)CO\(_3\)
- Na\(_2\)CO\(_3\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the stability trend of alkali metal carbonates.
Thermal stability of carbonates increases down the group.
Step 2: Analyze lithium carbonate.
Lithium carbonate is unstable due to the small size and high polarizing power of \( \mathrm{Li^+} \).
Step 3: Write the decomposition reaction.
\[ \mathrm{Li_2CO_3 \xrightarrow{\Delta} Li_2O + CO_2} \]
Step 4: Conclusion.
Only lithium carbonate decomposes on heating to release CO\(_2\).
Thermal stability of carbonates increases down the group.
Step 2: Analyze lithium carbonate.
Lithium carbonate is unstable due to the small size and high polarizing power of \( \mathrm{Li^+} \).
Step 3: Write the decomposition reaction.
\[ \mathrm{Li_2CO_3 \xrightarrow{\Delta} Li_2O + CO_2} \]
Step 4: Conclusion.
Only lithium carbonate decomposes on heating to release CO\(_2\).
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