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Previous year question hub

Redox Reactions - Physical Chemistry - Chemistry Previous Year Questions

Practice Redox Reactions - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

9Papers
9Years
19Questions
1Topics

Redox Reactions question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Redox Reactions. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Not classified 19 100%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 19 100%

Subject weightage

Top subjects by unique question coverage.

Chemistry
19 Qs

Most asked topics

Top topics across the included previous year papers.

Physical Chemistry
19 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Redox Reactions
19 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

KCET 2025
3 Qs
KCET 2024
1 Qs
KCET 2023
2 Qs
KCET 2022
2 Qs
KCET 2021
1 Qs
KCET 2020
3 Qs
KCET 2019
3 Qs
KCET 2018
2 Qs
KCET 2017
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
KCET 202520253View paper
KCET 202420241View paper
KCET 202320232View paper
KCET 202220222View paper
KCET 202120211View paper
KCET 202020203View paper
KCET 201920193View paper
KCET 201820182View paper
KCET 201720172View paper

All Redox Reactions previous year questions

Practice every matching question in batches of 20, with every available option.

1
2017 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2017
Extraction of chlorine from brine solution is based on
A
oxidation
B
acidification
C
chlorination
D
reduction
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2
2017 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2017
$3 \mathrm{ClO}^{-}(a q) \longrightarrow \mathrm{ClO}^{-}+2 \mathrm{Cl}^{-}$is an example of
A
oxidation reaction
B
reduction reaction
C
disproportionation reaction
D
decomposition reaction
Open complete paper
3
2018 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2018
$\mathrm{KMnO}_4$ acts as an oxidising agent in alkaline medium. When alkaline $\mathrm{KMnO}_4$ is treated with KI , iodide ion is oxidised to
A
$\mathrm{I}_2$
B
$1 \mathrm{O}^{-}$
C
$\mathrm{IO}_3^{-}$
D
$\mathrm{IO}_4^{-}$
Open complete paper
4
2018 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2018

    For the redox reaction

    $$\begin{aligned} x \mathrm{MnO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+ & z \mathrm{H}^{+} \longrightarrow \\ & m \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O} . \end{aligned}$$

    The values of $x, y, m$ and $n$ are

A
$10,2,5,2$
B
$2,5,2,10$
C
$6,4,2,4$
D
$3,5,2,10$
Open complete paper
5
2019 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2019

In the reaction of gold with aquaregia, oxidation state of nitrogen changes from

A
+4 to +2
B
+6 to +4
C
+5 to +2
D
+3 to +1
Open complete paper
6
2019 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2019

The number of moles of electron required to reduce 0.2 mole of \(\mathrm{Cr}_2 \mathrm{O}_7^{-2}\) to \(\mathrm{Cr}^{+3}\) is

A
1.2
B
6
C
12
D
0.6
Open complete paper
7
2019 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2019

Which of the following statement is correct?

A
\(\mathrm{Cl}_2\) oxidises \(\mathrm{H}_2 \mathrm{O}\) to \(\mathrm{O}_2\) but \(\mathrm{F}_2\) does not
B
\(\mathrm{Cl}_2\) is a stronger oxidising agent than \(\mathrm{F}_2\)
C
\(\mathrm{F}_2\) oxidises \(\mathrm{H}_2 \mathrm{O}\) to \(\mathrm{O}_2\) but \(\mathrm{Cl}_2\) does not
D
Fluoride is a good oxidising agent
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8
2020 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2020

How many moles of acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is required to liberate 6 moles of \(\mathrm{I}_2\) from an aqueous solution of \(\mathrm{I}^{-}\)?

A
2
B
1
C
0.25
D
0.5
Open complete paper
9
2020 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2020

In which of the following cases a chemical reaction is possible?

A
\(\mathrm{ZnSO}_4(a q)\) is placed in a copper vessel
B
\(\mathrm{AgNO}_3\) solution is stirred with a copper spoon
C
Conc. \(\mathrm{HNO}_3\) is stored in a platinum vessel
D
gold ornaments are washed with dil. \(\mathrm{HCl}\)
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10
2020 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2020

The oxidation number of nitrogen atoms in \(\mathrm{NH}_4 \mathrm{NO}_3\) are

A
\(+5,+5\)
B
\(-3,+5\)
C
\(+3,-5\)
D
\(-3,-3\)
Open complete paper
11
2021 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2021

Which of the following is not true for oxidation?

A
Addition of oxygen
B
Addition of electronegative element
C
Removal of hydrogen
D
Removal of electronegative element
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12
2022 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2022

All Cu(II) halides are known, except the iodide, the reason for it is that

A
\(\mathrm{Cu}^{2+}\) oxidises iodide to iodine
B
\(\mathrm{Cu}^{2+}\) has much more negative hydration enthalpy
C
\(\mathrm{Cu}^{2+}\) ion has smaller size.
D
iodide is bulky ion.
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13
2022 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2022

In which of the following compounds, an element exhibits two different oxidation states?

A
\(\mathrm{NH}_4 \mathrm{NO}_3\)
B
\(\mathrm{N}_2 \mathrm{H}_4\)
C
\(\mathrm{N}_3 \mathrm{H}\)
D
\(\mathrm{NH}_2 \mathrm{CONH}_2\)
Open complete paper
14
2023 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2023

$$a \mathrm{MnO}_4^{-}+b \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \longrightarrow x \mathrm{MnO}_2 +y \mathrm{SO}_4^{2-}+z \mathrm{OH}^{-}$$

\(a\) and \(y\) respectively are

A
8 ; 3
B
8 ; 6
C
3 ; 6
D
8 ; 8
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15
2023 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2023

The reducing agent in the given equations

$$4 \mathrm{Ag}(s)+8 \mathrm{CN}^{-}(a q)+2 \mathrm{H}_2 \mathrm{O}(a q)+\mathrm{O}_2(g) \longrightarrow 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+4 \mathrm{OH}^{-}(a q)$$

$$2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+\mathrm{Zn}(s) \longrightarrow {\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(a q)+2 \mathrm{Ag}(s)}$$

A
\(\mathrm{Zn}\)
B
\(\mathrm{O}_2\)
C
\(\mathrm{H}_2 \mathrm{O}\)
D
\(\mathrm{CN}^{-}\)
Open complete paper
16
2024 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2024

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

A
$\mathrm{SO}_2$ is oxidised to $\mathrm{SO}_4^{2-}$. $\mathrm{MnO}_4^{-}$is reduced to $\mathrm{Mn}^{2+}$.
B
$\mathrm{SO}_2$ is reduced to S . $\mathrm{MnO}_4^{-}$is oxidised to $\mathrm{MnO}_4$.
C
$\mathrm{SO}_2$ is oxidised to $\mathrm{SO}_3^{2-}$. $\mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$.
D
$\mathrm{SO}_2$ is reduced to $\mathrm{H}_2 \mathrm{~S}$. $\mathrm{MnO}_4^{-}$is oxidised to $\mathrm{MnO}_4$.
Open complete paper
17
2025 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2025

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

List-I (Types of redox reactions) List-II (Examples)
a. Combination reaction i. \(\mathrm{Cl}_{2 ( \, \mathrm{g} )} + 2 \mathrm{Br}_{( \mathrm{aq} )}^{-} \to 2 \mathrm{Cl}_{( \mathrm{aq} )}^{-} + \mathrm{Br}_{2 ( 1 )}\)\(\mathrm{Cl}_{2 ( \, \mathrm{g} )} + 2 \mathrm{Br}_{( \mathrm{aq} )}^{-} \to 2 \mathrm{Cl}_{( \mathrm{aq} )}^{-} + \mathrm{Br}_{2 ( 1 )}\)Cl_(2(g))+2Br_((aq))^(-)rarr2Cl_((aq))^(-)+Br_(2(1))
b. Decomposition reaction ii. \(2 \mathrm{H}_{2} \mathrm{O}_{2 ( \mathrm{aq} )} \to 2 \mathrm{H}_{2} \mathrm{O}_{( \mathrm{l} )} + \mathrm{O}_{2 ( \, \mathrm{g} )}\)\(2 \mathrm{H}_{2} \mathrm{O}_{2 ( \mathrm{aq} )} \to 2 \mathrm{H}_{2} \mathrm{O}_{( \mathrm{l} )} + \mathrm{O}_{2 ( \, \mathrm{g} )}\)2H_(2)O_(2(aq))rarr2H_(2)O_((l))+O_(2(g))
c. Displacement reaction iii. \(\mathrm{CH}_{4 ( \, \mathrm{g} )} + 2 \mathrm{O}_{2 ( \, \mathrm{g} )} \overset{\Delta \,}{\to} \mathrm{CO}_{2 ( \, \mathrm{g} )} + 2 \mathrm{H}_{2} \mathrm{O}_{( \mathrm{l} )}\)\(\mathrm{CH}_{4 ( \, \mathrm{g} )} + 2 \mathrm{O}_{2 ( \, \mathrm{g} )} \overset{\Delta \,}{\to} \mathrm{CO}_{2 ( \, \mathrm{g} )} + 2 \mathrm{H}_{2} \mathrm{O}_{( \mathrm{l} )}\)CH_(4(g))+2O_(2(g))rarr"Delta"CO_(2(g))+2H_(2)O_((l))
d. Disproportionation reaction iv. \(2 \mathrm{H}_{2} \mathrm{O}_{( 1 )} \overset{\Delta \,}{\to} 2 \mathrm{H}_{2 ( \, \mathrm{g} )} + \mathrm{O}_{2 ( \, \mathrm{g} )}\)\(2 \mathrm{H}_{2} \mathrm{O}_{( 1 )} \overset{\Delta \,}{\to} 2 \mathrm{H}_{2 ( \, \mathrm{g} )} + \mathrm{O}_{2 ( \, \mathrm{g} )}\)2H_(2)O_((1))rarr"Delta"2H_(2(g))+O_(2(g))

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

A
a-iv, b-iii, c-i, d-ii
B
a-ii, b-i, c-iv, d-iii
C
a-iii, b-iv, c-i, d-ii
D
a-iii, b-ii, c-i, d-iv
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18
2025 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2025

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

A
It is difficult to identify the end point
B
Nitric acid doesn't act as an indicator
C
Nitric acid itself is an oxidizing agent
D
Nitric acid is a weak acid than sulphuric acid
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19
2025 · Chemistry · Physical Chemistry · Redox Reactions
KCET 2025

In the reaction between hydrogen sulphide and acidified permanganate solution,

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