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(D) The bond angle depends on the electronegativity of the central atom and the size of the surrounding atoms. In $NH_3$ and $PH_3$,the bond angles ar

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$H_2Se$

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(D) The bond angle depends on the electronegativity of the central atom and the size of the surrounding atoms. In $NH_3$ and $PH_3$,the bond angles are $107^\circ$ and $93^\circ$ respectively. In $H_2O$ and $H_2Se$,the bond angles are $104.5^\circ$ and $91^\circ$ respectively. As the electronegativity of the central atom decreases down the group,the bond angle decreases. Comparing all,$H_2Se$ has the smallest bond angle of $91^\circ$.

Among the following molecules,which one has the smallest bond angle?

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