A) Oxygen shows +1 oxidation state in\[{{\text{O}}_{\text{2}}}{{\text{F}}_{\text{2}}}\text{.}\]
B) Roasting removes volatile impurities like As and Sb.
C) \[S{{m}^{3+}}\]is pink in colour.
D) Cobalt chloride acts as a catalyst to decompose bleaching powder.
Correct Answer: C
Solution :
\[\text{S}{{\text{m}}^{\text{3+}}}\text{ion}\] is yellow in colour.
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