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Year: 2020
Topic: Redox Reactions
1.
What is the change in oxidation number of carbon in the following reaction ?
\(\text{CH}_4\text{(g)} \,+\, \text{4Cl}_2\text{(g)} \, \rightarrow \, \text{CCl}_4\text{(i)}\, +\, \text{4HCl(g)}\)
(1).
0 to +4
(2).
-4 to +4
(3).
0 to -4
(4).
+4 to +4

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Year: 2025
Topic: Redox Reactions
2.
Consider the following compounds:
\(\text{K0}_2\), \(\text{H}_2\text{0}_2\) and \(\text{H}_2\text{SO}_4\)
The oxidation states of the underlined elements in them are, respectively,
(1).
+4, -4, and +6
(2).
+1, -1, and +6
(3).
+2, -2, and +6
(4).
+1, -2, and +4

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Year: 2024
Topic: Redox Reactions
3.
Among group 16 elements, which one does NOT show -2 oxidation state
(1).
Te
(2).
Po
(3).
O
(4).
Se

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Year: 2024
Topic: Redox Reactions
4.
Which is NOT a redox reaction?
(1).
\(\text{H}_2\,+\,\text{Cl}_2\,\rightarrow\,2\text{HCl}\)
(2).
\(\text{BaCl}_2\,+\,\text{Na}_2\text{SO}_4\,\rightarrow\,\text{BaSO}_4\,+\,2\text{NaCl}\)
(3).
\(\text{Zn}\,+\,\text{CuSO}_4\,\rightarrow\,\text{ZnSO}_4\,+\,\text{Cu}\)
(4).
\(2\text{KClO}_3\,+\,\text{I}_2\,\rightarrow\,2\text{KIO}_3\,+\,\text{Cl}_2\)

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Year: 2023
Topic: Redox Reactions
5.
On balancing the given redox reaction,

the coefficients a, b and c are found to be, respectively
(1).
3, 8, 1
(2).
1, 8, 3
(3).
8, 1, 3
(4).
1, 3, 8

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Year: 2021
Topic: Redox Reactions
6.
Which of the following reactions is the metal displacement reaction? Choose the right option.
(1).
(2).
(3).
(4).

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Year: 2019
Topic: Redox Reactions
7.
Which of the following reactions are disproportionation reaction ?

Select the correct option from the following:
(1).
(i), (ii), and (iii)
(2).
(i), (iii), and (iv)
(3).
(i) and (iv) only
(4).
(i) and (ii) only

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Year: 2018
Topic: Redox Reactions
8.
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below

Then the species undergoing dispro-portionation is
(1).
\(\text{HB}_rO\)
(2).
\(\text{Br}_2\)
(3).
\(\text{BrO}_4^-\)
(4).
\(\text{BrO}_3^-\)

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Year: 2018
Topic: Redox Reactions
9.
The correct order of N-compounds in its decreasing order of oxidation states is
(1).
NH4Cl, N2, NO, HNO3
(2).
HNO3, NH4Cl, NO, N2
(3).
HNO3, NO, NH4Cl, N2
(4).
HNO3 , NO, N2 , NH4Cl

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Solution
Year: 2018
Topic: Redox Reactions
10.
For the redox reaction

The correct coefficients of the reactants for the balanced equation are
(1).
\(\text{MNO}_4^- \rightarrow \) 5, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 16, \(\text{H1}^+ \rightarrow \) 2
(2).
\(\text{MNO}_4^- \rightarrow \) 2, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 16, \(\text{H1}^+ \rightarrow \) 5
(3).
\(\text{MNO}_4^- \rightarrow \) 2, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 5, \(\text{H1}^+ \rightarrow \) 16
(4).
\(\text{MNO}_4^- \rightarrow \) 16, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 5, \(\text{H1}^+ \rightarrow \) 2

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Year: 2017
Topic: Redox Reactions
11.
Name the gas that can readily decolourizes acidified KMnO4 solution.
(1).
P2O5
(2).
CO2
(3).
SO2
(4).
NO2

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Year: 2017
Topic: Redox Reactions
12.
In which pair of ions both the species contain S – S bond ?
(1).
\(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_7^{2-}\)
(2).
\(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_3^{2-}\)
(3).
\(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_3^{2-}\)
(4).
\(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_8^{2-}\)

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