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JEE Main levelSingle correct optionDifficulty 2 of 3sb139

Assertion (A): Sodium carbonate does not decompose on ordinary heating, even at red heat in a flame. Reason (R): An aqueous solution of sodium carbonate is alkaline.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: B

melts at about 1124 K without losing , since the weakly polarising cannot distort the carbonate ion enough, so A is true. R is also true because hydrolyses to give , but this has no bearing on thermal stability. R is not the explanation.
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