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NEET2009ChemistryClassification of Elements and Periodicity in PropertiesActual

The stability of +1 oxidation state increases in the sequence :

Options

  1. AGa < In < Al < Tl
  2. BAl < Ga < In < Tl
  3. CTl < In < Ga < Al
  4. DIn < Tl < Ga < Al

Correct answer

B. Al < Ga < In < Tl

Step-by-step solution

+ I stability down the group increase due to inert pair effect Al < Ga < In < Tl

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