$A s_{2} S_{3}$ reacts with $O_{2}$ to gives $S O_{4}$ and $A s_{2} O_{3}$ . What is the smallest whole number coefficient for $O_{2}$ when the equation for this reaction is balanced correctly?
$. . . . . A s_{2} S_{3} (s) + O_{2} (g) \to . . A s_{2} O_{3} (s) + S O_{2} (g)$

3

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5

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7

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9

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Solution

The correct option is B $9$
Here the answer is wrong, and the correct answer is option(D).

The Balanced equation is:

$2 A s_{2} S_{3 (S)} + 9 O_{2 (g)} = 2 A s_{2} O_{3 (S)} + 6 S O_{2 (g)}$ .

Hence the smallest whole co-efficient of $O_{2}$ is 9

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