KCET 2026 | Redox Reactions Question 2 | Chemistry

Given below are two statements.
Statement-I: In $\text{H}_2\text{O}_2$, each oxygen atom is assigned an oxidation number of $-1$, in $\text{RbO}_2$ each oxygen atom is assigned an oxidation number of $-\dfrac{1}{2}$.
Statement-II: Representation of $\text{HAuCl}_4$ and $\text{MnO}_2$ in stock notation is $\text{HAu(III)Cl}_4$ and $\text{Mn(II)O}_2$, respectively.
Examine the above statements and choose the correct answer.

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

Statement I is incorrect but Statement II is correct

KCET 2025

MCQ (Single Correct Answer)

-0

$$ \text { Match List-I with List-II } $$

List-I (Types of redox reactions)	List-II (Examples)
a. Combination reaction	i. ${Cl}_{2 (g)} + 2 {Br}_{(aq)}^{-} \to 2 {Cl}_{(aq)}^{-} + {Br}_{2 (1)}$
b. Decomposition reaction	ii. $2 H_{2} O_{2 (aq)} \to 2 H_{2} O_{(l)} + O_{2 (g)}$
c. Displacement reaction	iii. ${CH}_{4 (g)} + 2 O_{2 (g)} \overset{Δ}{\to} {CO}_{2 (g)} + 2 H_{2} O_{(l)}$
d. Disproportionation reaction	iv. $2 H_{2} O_{(1)} \overset{Δ}{\to} 2 H_{2 (g)} + O_{2 (g)}$

$$ \text { Choose the correct answer from the options given below. } $$

a-iv, b-iii, c-i, d-ii

a-ii, b-i, c-iv, d-iii

a-iii, b-iv, c-i, d-ii

a-iii, b-ii, c-i, d-iv

KCET 2025

MCQ (Single Correct Answer)

-0

In the reaction between hydrogen sulphide and acidified permanganate solution,

$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{S}, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$

$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$

$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$

$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{S}, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{Mn}^{2+}$

KCET 2025

MCQ (Single Correct Answer)

-0

In the titration of potassium permanganate $\left(\mathrm{KMnO}_4\right)$ against Ferrous ammonium sulphate $(\mathrm{FAS})$ solution, dilute sulphuric acid but not nitric acid is used to maintain acidic medium, because

It is difficult to identify the end point

Nitric acid doesn't act as an indicator

Nitric acid itself is an oxidizing agent

Nitric acid is a weak acid than sulphuric acid

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Some Basic Concepts of Chemistry Atomic Structure States of Matter Thermodynamics Chemical Equilibrium Ionic Equilibrium Liquid Solution Redox Reactions Surface Chemistry Solid State Electrochemistry Chemical Kinetics Nuclear Chemistry

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