Which of the following statements are correct? a. S-S bond is pre… - Vidyadip

MCQ

Which of the following statements are correct?
$a. S-S$ bond is present in $\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_6$.
$b.$ In peroxosulphuric acid $\left(\mathrm{H}_2 \mathrm{SO}_5\right)$ sulphur is in $+6$ oxidation state.
$c.$ Iron powder along with $\mathrm{Al}_2 \mathrm{O}_3$ and $\mathrm{K}_2 \mathrm{O}$ is used as a catalyst in the preparation of $\mathrm{NH}_3$ by Haber's process.
$d.$ Change in enthalpy is positive for the preparation of $\mathrm{SO}_3$ by catalytic oxidation of $\mathrm{SO}_2$.

✓
$a$ and $b$
B
$a$ and $c$
C
$b$ and $c$
D
$a$ and $d$

✓

Answer

Correct option: A.

$a$ and $b$

In $\mathrm{H}_2 \mathrm{SO}_5$, there is a peroxo$-$linkage.

$(O$ in peroxide linkage has oxidation state$-1)$

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