In the course of a chemical reaction,an oxidant:

When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salts,then $Sn^{2+}$ changes to:

Which of the following will not act as an oxidizing agent?

Which one of the following statements is true for $HNO_2$?

Which one of the following acts as an oxidising agent?

$(A) \ HOCl + H_2O_2 \rightarrow H_3O^{+} + Cl^{-} + O_2$
$(B) \ I_2 + H_2O_2 + 2 OH^{-} \rightarrow 2 I^{-} + 2 H_2O + O_2$
Choose the correct option.