Redox Reactions

The difference in the oxidation numbers of the two types of sulphur atoms in $\ce{Na2S4O6}$ is

Reaction of $\ce{Br2}$ with $\ce{Na2CO3}$ in aqueous solution gives sodium bromide and sodium bromate with evolution of $\ce{CO2}$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

Reduction of the metal centre in aqueous permanganate ion involves

In self-reduction, the reducing species is

Among the following, the number of elements showing only one non-zero oxidation state is

O, Cl, F, N, P, Sn, Tl, Na, Ti

For the reduction of $\ce{NO3-}$ ion in an aqueous solution, $E^\circ$ is +0.96 V. Values of $E^\circ$ for some metal ions are given below

Half-reaction	$E^\circ$
$\ce{V^{2+}(aq) + 2e- -> V}$	−1.19 V
$\ce{Fe^{3+}(aq) + 3e- -> Fe}$	−0.04 V
$\ce{Au^{3+}(aq) + 3e- -> Au}$	+1.40 V
$\ce{Hg^{2+}(aq) + 2e- -> Hg}$	+0.86 V

The pair(s) of metals that is(are) oxidized by $\ce{NO3-}$ in aqueous solution is(are)

Match each of the reactions given in Column I with the corresponding product(s) given in Column II.

The oxidation number of Mn in the product of alkaline oxidative fusion of $\ce{MnO2}$ is

Aqueous solution of $\ce{Na2S2O3}$ on reaction with $\ce{Cl2}$ gives

White phosphorus on reaction with NaOH gives $\ce{PH3}$ as one of the products. This is a

Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

Among the following, identify the correct statement.

Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.