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Which of the following element exhibits + 3 Oxidation State only?

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in Chemistry – Class 11 by (148k points)
Which of the following element exhibits + 3 Oxidation State only?

(a) Gallium

(b) Thallium

(c) Indium

(d) Aluminium

This question was posed to me at a job interview.

The origin of the question is p-Block Elements topic in division p-Block Elements of Chemistry – Class 11

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Correct option is (d) Aluminium

The explanation: Boron and aluminium exhibit oxidation state of + 3 only, while gallium, indium and thallium exhibit oxidation states of both +1 and +3. As we move down the group, the tendency to exhibit + 3 Oxidation State decreases this occurs due to the inert pair effect.

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