${\mathrm{MnO}}_4^{2-}$ undergoes disproportionation reaction in acidic medium but ${\mathrm{MnO}}_4^{-}$ does not. It is:

1.	Due to the highest oxidation state of Mn in  MnO42-
2.	Due to the highest oxidation state of Mn in  MnO4-
3.	Due to the endothermic nature of the disproportionation reaction.
4.	Due to the exothermic nature of the disproportionation reaction.

Nitric acid reacts with PbO but does not react with PbO₂ , because -

1. PbO is a base while PbO₂ is a strong oxidizing reagent

2. PbO is a base while PbO₂ is a weak oxidizing reagent

3. PbO is neutral while PbO₂ is a strong oxidizing reagent

4. PbO is acid while PbO₂ is a strong oxidizing reagent

The oxidation state of P in ${\mathrm{HPO}}_3^{2-}$ is-

The oxidation state of two S-atoms in ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is -

1. +2 and +4

2. +3 and -2

3. +4 and -2

4. +6 and -2

Based on standard electrode potentials given above, the correct arrangement for increasing order of reducing power of
elements is: 

In the given reaction, what is the name of the species that bleaches the substances due to its oxidising action?

Cl₂(g) + 2OH^-(aq) → ClO^-(aq) + Cl^-(aq) + H₂O(l)

1. ClO^- 

2. Cl₂

3. Cl^-

4. Both ClO^- and Cl^-

The oxidation number of the atom (in bold) in the following species is given. Identify, which one is incorrectly related?

1. \(\mathbf{Cu}_{2} O\) is \(- 1\)

2. \(\mathbf{Cl} O_{3}^{-}\) is \(+ 5\)

3. \(K_{2} \mathbf{Cr}_{2} O_{7}\) is \(+ 6\)

4. \(H \mathbf{Au} Cl_{4}\) is \(+ 3\)

The element that does not show a disproportionation tendency is/are:

1. Cl

2. Br

3. F

4. I

Given below are two statements: