KCET 2025 | Redox Reactions Question 1 | Chemistry

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

KCET 2024

MCQ (Single Correct Answer)

-0

In the reaction between moist $\mathrm{SO}_2$ and acidified permanganate solution.

$\mathrm{SO}_2$ is oxidised to $\mathrm{SO}_4^{2-}$. $\mathrm{MnO}_4^{-}$is reduced to $\mathrm{Mn}^{2+}$.

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

$\mathrm{SO}_2$ is oxidised to $\mathrm{SO}_3^{2-}$. $\mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$.

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

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Chemistry

Physical Chemistry

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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Periodic Table and Periodicity Chemical Bonding and Molecular Structure Metallurgy Hydrogen and It's Compounds s-Block Elements p-Block Elements d and f Block Elements Coordination Compounds Salt Analysis Environmental Chemistry

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IUPAC Nomenclatures General Organic Chemistry Isomerism Hydrocarbons Haloalkanes and Haloarenes Alcohol, Phenols and Ethers Aldehyde and Ketone Carboxylic Acids and Its Derivatives Compounds Containing Nitrogen Polymers Biomolecules Chemistry in Everyday Life Practical Organic Chemistry