Which of the following carbonates of alkali metals is not stable towards heat and is decomposed on heating to its oxide along with liberation of CO2?
Correct answer: A. Li2CO3
- A. Li2CO3
- B. Mg2CO3
- C. K2CO3
- D. Na2CO3
Explanation
A is correct as Lithium carbonate is not stable to heat. Hence, it decomposes at a lower temperature.B is incorrect as Mg2CO3 is stable upon heating.C is incorrect as K2CO3 is stable upon heating.D is incorrect as Na2CO3 is stable upon heating
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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