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NEET 2015
Exam
NEET
Year
2015
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

NEET 2015 · Chemistry · p Block Elements (Group 13 & 14)

The stability of +1 oxidation state among Al, Ga, In and Tl...

The stability of +1 oxidation state among Al, Ga, In\text{Al, Ga, In} and Tl\text{Tl} increases in the sequence:

Options

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

Correct answer

B. Al<Ga<In<TlAl < Ga < In < Tl

Step-by-step solution

The inert-pair effect is the tendency of the two electrons in the outermost atomic-s orbital to remain unshared in compounds of post-transition elements.

Inert-pair effect is seen in the elements of 13th,14th, 15th and 16th groups.

Due to the inert-pair effect elements down the group exhibit oxidation state which is 2 units lesser than the elements above them.

Stability of +1 oxidation state due to inert pair effect is in the order Al<Ga<In<TlAl < Ga < In < Tl

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