A) An oxidising agent
B) A reducing agent
C) An acid
D) A catalyst
Correct Answer: A
Solution :
\[\underset{\text{reducing agent}}{\mathop{2{{H}_{2}}S}}\,\,+\underset{\text{oxidising agent}}{\mathop{S{{O}_{2}}}}\,\,\to \,2{{H}_{2}}O+3S\]
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