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JEE Main2014ChemistryClassification of Elements and Periodicity in PropertiesActual

In the following sets of reactants which two sets best exhibit the amphoteric character of Al 2 O 3 . xH 2 O ? Set I Al 2 O 3 · xH 2 O s + OH aq - Set II Al 2 O 3 x · H 2 O s + H 2 O l Set III Al 2 O 3 x · H 2 O s + H aq + Set IV Al 2 O 3 · xH 2 O s + NH 3 aq

Options

  1. A2 and 4
  2. B1 and 2
  3. C1 and 3
  4. D3 and 4

Correct answer

C. 1 and 3

Step-by-step solution

For a substance to be called amphoteric, it should be able to react as a base as well as an acid. Hence, when it is reacted with a base, it should act as an acid, and when it is reacted with an acid, it should behave as a base. The reactions for amphoteric nature of Al 2 O 3 . x H 2 O(s) are Al 2 O 3 . x H 2 O s → OH aq - Al OH 4 - aq Aluminate anion Al 2 O 3 . x H 2 O s → H aq + Al H 2 O 6 aq 3 + . [Al(H 2 O) 6 ] 3+ is octahedral complex ion [Al(OH) 4 ] -1 tetrahedral at pH = 13

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