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  4. The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down the group 15 of the periodic table is due to

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Q. The decreasing values of bond angles from $NH_3$ (106$^\circ$) to $SbH_3$ (101$^\circ$) down the group 15 of the periodic table is due to

AIEEEAIEEE 2006Chemical Bonding and Molecular Structure

Solution:

With the increase in electronegativity, bond pairs move farther and farther away from the central atom. As a result bp - bp repulsion decreases and the angle decreases accordingl