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  4. The basic nature of hydroxide of group 13 (group IIIA) decreases progressively down the group.

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Q. The basic nature of hydroxide of group $13$ (group IIIA) decreases progressively down the group.

IIT JEEIIT JEE 1993The p-Block Elements

Solution:

The basic nature of hydroxide of group-$13$ increases from top to bottom due to increase in electropositive character.