SELECT * FROM question_mgmt as q WHERE id=3190 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=51 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry The s Block Elements why is li2co3 decomposed at a lower temperature wh

Question:

Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature?

Answer:

As we move down the alkali metal group, the electropositive character increases. This causes an increase in the stability of alkali carbonates. However, lithium carbonate is not so stable to heat. This is because lithium carbonate is covalent. Lithium ion, being very small in size, polarizes large carbonate ion, leading to the formation of more stable lithium oxide.

Li2CO3    LiO2 +  CO2

Therefore, lithium carbonate decomposes at a low temperature while a stable sodium carbonate decomposes at a high temperature.


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