Assertion :  As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases.

Reason :  Lithium carbonates is not so stable to heat : lithium being very small in size polarises a large CO3-2 ion leading to the formation of more stable Li2O and CO2

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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