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NEET 2009
Exam
NEET
Year
2009
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2009 · Chemistry · Classification of Elements and Periodicity in Properties

The stability of +1 oxidation state increases in the sequence

The stability of +1 oxidation state increases in the sequence

Options

  1. AAl<Ga<In<Tl\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}
  2. BTl<\mathrm{Tl} < In <Ga<Al< \mathrm{Ga} < \mathrm{Al}
  3. CIn<Tl<Ga<Al\mathrm{In} < \mathrm{Tl} < \mathrm{Ga} < \mathrm{Al}
  4. DGa<In<Al<Tl\mathrm{Ga} < \mathrm{In} < \mathrm{Al} < \mathrm{Tl}

Correct answer

A. Al<Ga<In<Tl\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}

Step-by-step solution

Key Idea Stability of lower oxidation states increases on moving down a group due to inert pair effect. The given elements belong to third group. These elements mainly exhibit +3 and +1 oxidation state. As we know the stability of lower oxidation state, ie,+1i e,+1 state, increases on moving down a group, the sequence of stability is Al\mathrm{Al}< Ga\mathrm{Ga}< In\mathrm{In}< Tl\mathrm{Tl}
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