Which species has the same shape as the $N O_{3}^{-}$ ion?

S O_{3}

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S O_{3}^{2 -}

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C l F_{3}

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C l O_{3}^{-}

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Solution

The correct option is B $S O_{3}$
$S O_{3}$ because it is isoelectronic with $N O_{3}^{-}$
Both are trigonal planar, as the central $N$ or $S$ atom has no lone pairs and 3 bonds to the three oxygens. $(S O_{3})_{2}$ is pyramidal, as there are the three bonds but also a lone pair on the $S$ atom at the centre, so VSEPR theory predicts a pyramidal shape with bond angles about than 107 degrees.

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