Oxidation number

In which of the following reactions $\ce{H2O2}$ acts as a reducing agent ?

(a) $\ce{H2O2 + 2H+ + 2e- -> 2H2O}$

(b) $\ce{H2O2 - 2e- -> O2 + 2H+}$

(c) $\ce{H2O2 + 2e- -> 2OH-}$

(d) $\ce{H2O2 + 2OH- - 2e- -> O2 + 2H2O}$

Given

$\ce{Fe^3+(aq) + e- -> Fe^2+(aq)}$; $E^\circ=+0.77$ V

$\ce{Al^3+(aq) + 3e- -> Al(s)}$; $E^\circ=-1.66$ V

$\ce{Br2(aq) + 2e- -> 2Br-}$; $E^\circ=+1.09$ V

Considering the electrode potentials, which of the following represents the correct order of reducing power ?

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases $\ce{H2O2}$ acts as a reducing agent in acid medium ?

Consider the reaction :
$$\ce{H2SO3_{(aq)} + Sn^{4+}_{(aq)} + H2O_{(l)} -> Sn^{2+}_{(aq)} + HSO4^-_{(aq)} + 3H^+_{(aq)}}$$
Which of the following statements is correct ?

Amongst the following, identify the species with an atom in +6 oxidation state :

Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type; the oxidation states of phosphorus in phosphine and the other product are respectively

For the given aqueous reactions, which of the statement(s) is (are) true?

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

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

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)

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

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

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.