The molecule having the largest bond angle is

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(A) In the group $16$ hydrides $(H_2O, H_2S, H_2Se, H_2Te)$,the central atom is bonded to two hydrogen atoms and has two lone pairs.As we move down th

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$H_2O$

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(A) In the group $16$ hydrides $(H_2O, H_2S, H_2Se, H_2Te)$,the central atom is bonded to two hydrogen atoms and has two lone pairs.As we move down the group,the electronegativity of the central atom decreases.This leads to an increase in the bond length and a decrease in the bond pair-bond pair repulsion.Consequently,the bond angle decreases as the size of the central atom increases.Therefore,$H_2O$ has the largest bond angle of $104.5^{\circ}$.

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