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Resonance Effect

Which of the ...

Question

Which of the following have the smallest $O - S - O$ bond angle?

S O_{3}^{2 -}

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S O_{3}

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S O_{4}^{2 -}

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S O_{3}^{2 -}

and

S O_{3}

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Solution

The correct options are
A $S O_{3}^{2 -}$
C $S O_{4}^{2 -}$
The $O - S - O$ bond angle of ${S O}_{3}^{2 -}$ is $109. 5^{0}$
The $O - S - O$ bond angle of ${S O}_{3}$ is $120^{0}$
The $O - S - O$ bond angle of ${S O}_{4}^{2 -}$ is $109. 5^{0}$
Hence the molecule has smallest $O - S - O$ bond angle are ${S O}_{3}^{2 -}$ and ${S O}_{4}^{2 -}$
The correct option are $A$ and $C$ .

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The rates of diffusion of $S O_{2}, C O_{2}, P C l_{3} a n d S O_{3}$ are in the following order –

The heat of formation of $S O_{2}$ is:

$S + \frac{3}{2} O_{2} \to S O_{3} + 2 x k J$
$S O_{2} + \frac{1}{2} O_{2} \to S O_{3} + y k J$

S + \frac{3}{2} O_{2} ⟶ S O_{3} + 2 x k c a l

S O_{2} + \frac{1}{2} O_{2} ⟶ S O_{3} + y k c a l

S O_{2}

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