A) \[S{{n}^{2+}}\]
B) \[S{{n}^{4+}}\]
C) \[As\]
D) \[HAs{{O}_{2}}\]
Correct Answer: D
Solution :
Oxidizing agent itself, undergoes reduction during a redox reaction \[\overset{+3}{\mathop{HAs{{O}_{2}}}}\,+\overset{+2}{\mathop{Sn}}\,\xrightarrow{{}}\,\overset{0}{\mathop{As}}\,+\overset{2+}{\mathop{Sn}}\,+{{H}_{2}}O\] Hence, here \[HAs{{O}_{2}}\]is acting as oxidizing agent.
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