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Mathematics of Dipole Moment

Why is the bo...

Question

Why is the bond angle of H₂ O greater than that of H₂S?

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Solution

This is due to the fact that in the water molecule oxygen atom is present which is more electronegative than sulfur in H₂S ( electronegativity decreases down the group) .As the electronegativity of the central atom decreases the lone pair of electrons lie further from it and therefore lp- lp repulsion decrease. Hence bond angle decrease.In water molecule where oxygen atom is more electronegative holds the lone pair of electrons on itself and therefore more lp-lp repulsion and more is the bond angle.

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