Which of the following,after reacting with $KI$,does not liberate iodine?

Consider the reaction $H_2SO_{3(aq)} + Sn^{4+}_{(aq)} + H_2O_{(l)} \to Sn^{2+}_{(aq)} + HSO_4^-(aq) + 3H^{+}_{(aq)}$. Which of the following statements is correct?

Which of the following reactions shows the behavior of $H_2SO_4$ as an oxidizing agent?

In the reaction $Cr_2O_7^{2-} + X \xrightarrow{H^+} Cr^{3+} + H_2O + \text{Oxidized product of } X$,which of the following cannot be $X$?

Which of the following is not a reducing agent?

Which of the following oxidizing agents is used as an antiseptic?