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P Block Elements question

2009 · Q103
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P Block Elements question

2009 · Q103

NEETChemistryP Block ElementsMCQ+4 / −1
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence
  1. A
    Al < Ga < In < Tl
  2. B
    Tl < In < Ga < Al
  3. C
    In < Tl < Ga < Al
  4. D
    Ga < In < Al < Tl
View written solutionFree

Correct answer: A

The given elements belong to 13th group. The elements mainly exhibit +3 and +1 oxidation states. As we know, the stability of lower oxidation state i.e., +1 state, increases on moving down the group due to inert pair effect. The, stability follows the order :

Al < Ga < In < Tl

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