Redox Reactions PYQs

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

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