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AIIMS 2005
Exam
AIIMS
Year
2005
Subject
Chemistry
Chapter
Practical Chemistry

AIIMS 2005 · Chemistry · Practical Chemistry

Assertion : Borax bead test is not suitable for Al( III ) . Reason...

Assertion : Borax bead test is not suitable for Al(\mathrm{Al}(\mathrm{III})). Reason : Al2O3\mathrm{Al}_2 \mathrm{O}_3 is insoluble in water.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion

Step-by-step solution

Borax bead test is not suitable for Al\mathrm{Al} (III) because its oxidising as well as reducing flame is colourless in both hot as well as cold. Alumina is insoluble in water as they exist in hydrated form like Al2O3⋅2H2O,Al2O3⋅H2O\mathrm{Al}_2 \mathrm{O}_3 \cdot 2 \mathrm{H}_2 \mathrm{O}, \mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{H}_2 \mathrm{O} etc.
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