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JEE Main20199 Apr 2019Evening ShiftChemistryp Block Elements (Group 13 & 14)Actual

The correct statements among I to III regrading group 13 element oxides are, (I) Boron trioxide is acidic. (II) Oxides of aluminum and gallium are amphoteric. (III) Oxides of indium and thallium are basic.

Options

  1. A(I) and (III) only
  2. B(I) and (II) only
  3. C(I), (II) and (III)
  4. D(II) and (III) only

Correct answer

C. (I), (II) and (III)

Step-by-step solution

All statements are correct B 2 O 3 → acidic , B 2 O 3 is an anhydride of Orthoboric Acid. A l 2 O 3 and G a 2 O 3 are amphoteric, amphoteric oxides can react with acids as well as bases. oxides of ln and Tl are basic. As we move down the group basicity of oxides increases due to increase in metallic character of elements

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