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$X+Y \rightarrow$ oleum
The sum of oxidation states of central atom in $\mathrm{X}$ and $Y$ is
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The sum of oxidation states of central atom in $\mathrm{X}$ and $Y$ is
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The correct answer is:
12
$\mathrm{H}_2 \stackrel{+6}{\mathrm{~S}} \mathrm{O}_4+\stackrel{+6}{\mathrm{~S}} \mathrm{O}_3 \rightarrow \mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$ (oleum)
$\Rightarrow$ Sum of oxidation states $=6+6=12$
$\Rightarrow$ Sum of oxidation states $=6+6=12$
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