Bromine is liberated when an aqueous solution of potassium bromide is treated with

In the reaction $2Ag + 2H_2SO_4 \to Ag_2SO_4 + 2H_2O + SO_2$,$H_2SO_4$ acts as

Which of the following is not a reducing agent?

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?

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

Which of the following mixtures is chromic acid?