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MolSynapse / Question bank / s-Block Elements / Important compounds: NaOH, Na2CO3, NaHCO3, CaO, CaCO3, plaster of Paris
JEE Main levelSingle correct optionDifficulty 2 of 3sb179

Assertion (A): An aqueous solution of sodium carbonate turns red litmus blue. Reason (R): The sodium ion is hydrolysed in water to give hydroxide ions.

  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: C

A is true. is the cation of the strong base and does not hydrolyse, so R is false. The basicity arises from .
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