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JEE Advanced levelSingle correct optionDifficulty 3 of 3pn126

Assertion (A): Sodium bismuthate oxidises to in acidic medium. Reason (R): Bi(V) is less stable than Bi(III) because of the inert pair effect. Choose the correct option.

  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: A

NaBiO3 contains Bi(V). Because the 6s2 pair is reluctant to take part in bonding, Bi(V) readily gains two electrons to become the stable Bi(III), making Bi(V) a strong oxidant. Both statements are true and R explains A.
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