COMEDK 2025 Evening Shift | Redox Reactions Question 1 | Chemistry

i) $\quad \mathrm{xMnO}_4^{--}+$(a) $\mathrm{SO}_3{ }^{2-}+$ (b) $\mathrm{H}^{+} \cdots \longrightarrow \mathrm{xMn}^{2+}+$ (a) $\mathrm{SO}_4{ }^{2-}+$ (c) $\mathrm{H}_2 \mathrm{O}$

ii) (c) $\mathrm{S}_2 \mathrm{O}_3{ }^{2-}+$ (d) $\mathrm{MnO}_4^{-}+\mathrm{H}_2 \mathrm{O} \cdots \rightarrow$ (d) $\mathrm{MnO}_2+$ (b) $\mathrm{SO}_4{ }^{2-}+\mathrm{xOH}^{-}$

$(a)=3$ (b) $=8$ $(c)=6$ $(d)=6$

$(a)=5$ (b) $=6$ $(c)=3$ $(\mathrm{d})=8$

(a) $=2$ (b) $=8$ $(c)=4$ $(\mathrm{d})=4$

$(a)=2$ (b) $=6$ $(c)=6$ $(d)=5$

COMEDK 2025 Evening Shift

MCQ (Single Correct Answer)

-0

An example of disproportionation reaction is :

$2 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$

$2 \mathrm{KMnO}_4 \rightarrow \mathrm{~K}_2 \mathrm{MnO}_4+\mathrm{MnO}_2+\mathrm{O}_2$

$2 \mathrm{MnO}_4^{-}+10 \mathrm{I}^{-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+5 \mathrm{I}_2+8 \mathrm{H}_2 \mathrm{O}$

$2 \mathrm{NaI}+\mathrm{Cl}_2 \rightarrow 2 \mathrm{NaCl}+\mathrm{I}_2$

COMEDK 2025 Evening Shift

MCQ (Single Correct Answer)

-0

The oxidation number of potassium in $\mathrm{K}_2 \mathrm{O}, \mathrm{K}_2 \mathrm{O}_2$ and $\mathrm{KO}_2$ respectively are:

$+1,+2,+4$

$+1,+2,+1$

$+1,+1,+1$

$+2,+1,+1$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

Given below are 2 statements: one Assertion and the other Reason. Which one of the following options is correct?

Assertion : Sulphur dioxide and Hydrogen peroxide can act as both oxidising and reducing agents but Nitric acid can act as only oxidising agent.

Reason : Sulphur and Oxygen can exhibit more than one stable oxidation states while Nitrogen does not.

Assertion is correct but Reason is wrong.

Both Assertion and Reason are wrong.

Both Assertion and Reason are correct.

Assertion is wrong but Reason is correct.

COMEDK Subjects