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  4. Electropositive character for the elements of group 13 follows the order

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Q. Electropositive character for the elements of group 13 follows the order

The p-Block Elements

Solution:

As we move from B to Al, the sum of ΔiH1+ΔiH2+ΔiH3 decreases substantially (6887kjmol−1 to 5137kjmol−1) due to increase in the atomic size and hence Al has a high tendency to lose electrons. Since the electrode potentials increase from Al to Tl, therefore, their electropositive character decreases, i.e., Al(−1.66V) to Ga(−0.56V) to In(−0.34V) to Tl(+1.26V) accordingly.