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BITSAT2015Chemistryp Block Elements (Group 13 & 14)Actual

Which of the following is the most basic oxide?

Options

  1. ASb ₂ O ₃
  2. BBi ₂ O ₃
  3. CSeO ₂
  4. DAl ₂ O ₃

Correct answer

B. Bi ₂ O ₃

Step-by-step solution

More the oxidation state of the central atom (metal) more is its acidity. Hence SeO ₂( O . S . of Se =+4) is acidic. Further for a given O.S., the basic character of the oxides increases with the increasing size of the central atom. Thus Al ₂ O ₃ and Sb ₂ O ₃ are amphoteric and Bi ₂ O ₃ is basic.

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