Question:
Identify the compound which gives CO\(_2\) more readily on heating.
Identify the compound which gives CO\(_2\) more readily on heating.
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Smaller cations (like Li\(^+\)) polarize the carbonate ion more, making decomposition easier.
- Thermal stability trend: Li\(_2\)CO\(_3\)<Na\(_2\)CO\(_3\)<CaCO\(_3\) (Li\(_2\)CO\(_3\) decomposes at the lowest temperature).
Updated On: Mar 11, 2025
- \( \text{CaCO}_3 \)
- \( \text{NaHCO}_3 \)
- \( \text{Na}_2\text{CO}_3 \)
- \( \text{Li}_2\text{CO}_3 \)
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The Correct Option is D
Solution and Explanation
Step 1: The decomposition reaction of metal carbonates occurs as follows:
\[
MCO_3 \rightarrow MO + CO_2
\]
where \( M \) is a metal.
Step 2: The thermal stability of metal carbonates decreases as we move up the group in the periodic table.
- Lithium carbonate (Li\(_2\)CO\(_3\)) decomposes more easily than CaCO\(_3\), NaHCO\(_3\), and Na\(_2\)CO\(_3\) due to the small size of the Li\(^{+}\) ion, which distorts the carbonate ion, making it easier to decompose.
Thus, the correct answer is \( \text{Li}_2\text{CO}_3 \).
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