The possible oxidation states of III A group elements are +3, +1. On moving down the group, +1 is more stable than +3. It is due to

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The possible oxidation states of III A group elements are +3, +1. On moving down the group, +1 is more stable than +3. It is due to

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Inert pair effect

neither 1 nor 2

Shielding effect

Both 1 and 2

answer is A.

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Detailed Solution

It is due to Inert pair effect.

According to Inert pair effect, as we move down the group the stability of lower oxidation state increases and higher Oxidation state decreases.

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