Redox Reactions PYQs

Consider the following compounds: KO₂, H₂O₂ and H₂SO₄. The oxidation states of the underlined elements in them are, respectively,

Which reaction is NOT a redox reaction?

On balancing the given redox reaction, a Cr₂O₇²⁻ + b SO₃²⁻(aq) + c H⁺(aq) → 2a Cr³⁺(aq) + b SO₄²⁻(aq) + c/2 H₂O(l) the coefficients a, b and c are found to be, respectively -

Which of the following reactions is the metal displacement reaction? Choose the right option.

What is the change in oxidation number of carbon in the following reaction? $CH_4(g) + 4Cl_2(g) \rightarrow CCl_4(l) + 4HCl(g)$

For the redox reaction: $$\mathrm{MnO_4^- + C_2O_4^{2-} + H^+ \rightarrow Mn^{2+} + CO_2 + H_2O}$$ The correct coefficients of the reactants for the balanced equation are

Consider the change in oxidation state of Bromine corresponding to different E° values as shown in the diagram below. Then the species undergoing disproportionation is

Name the gas that can readily decolourise acidified $KMnO_4$ solution:

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO₄ for complete oxidation?

The pair of compounds that can exist together is:

Oxidation number of P in $PO_4^{3-}$, of S in $SO_4^{2-}$ and that of Cr in $Cr_2O_7^{2-}$ are respectively:

Among the following which is the strongest oxidizing agent?

Number of moles of MnO₄⁻ required to oxidize one mole of ferrous oxalate completely in acidic medium will be

The number of moles of $KMnO_4$ reduced by one mole of $KI$ in alkaline medium is: