Redox Reactions PYQs - Last 10 Years
MHT CET / Chemistry / Physical Chemistry / 78 recent questions
ChemistryPhysical Chemistry2017-2026
Practice 78 MHT CET Chemistry questions from Redox Reactions. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Chemistry / Physical Chemistry
2019-2026
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Last 10 Years Redox Reactions Questions
Showing 50 of 78 filtered questions.
1Redox Reactions
What is the difference in oxidation number of nitrogen when nitric acid is converted into nitrous oxide ?
MCQ+1 / -02026
2Redox Reactions
What is the number of electrons gained by Cl atom when $n$ mole of $\text{ClO}_4^-$ is transformed into $n$ mole of $\text{ClO}_2^-$ ion?
MCQ+1 / -02026
3Redox Reactions
What is the oxidation number of Cl in $\text{HOClO}_2$?
MCQ+1 / -02026
4Redox Reactions
What is the oxidation state of Xe in $\text{XeOF}_4$?
MCQ+1 / -02026
5Redox Reactions
Identify change in oxidation state of oxidising agent in following redox reaction.$3\text{H}_3\text{AsO}_{3(aq)} + \text{BrO}_{3(aq)}^- \longrightarrow \text{Br}_{(aq)}^- + 3\text{H}_3\text{AsO}_{4(aq)}$
MCQ+1 / -02026
6Redox Reactions
What is the oxidation number of carbon in oxalic acid ?
MCQ+1 / -02026
7Redox Reactions
Which of the following reactions is NOT an example of redox reaction?
MCQ+1 / -02026
8Redox Reactions
Identify oxidation number of Sulphur respectively in $\text{SO}_2$ and $\text{SO}_4^{2-}$ .
MCQ+1 / -02026
9Redox Reactions
What is the oxidation number of oxygen in $\text{KO}_2$ ?
MCQ+1 / -02026
10Redox Reactions
Which of the following phenomena represents oxidation?
MCQ+1 / -02026
11Redox Reactions
What is oxidation state of chlorine in chlorous acid?
MCQ+1 / -02026
12Redox Reactions
For the following redox reaction, find the correct statement.$\text{Sn}^{2+} + 2\text{Fe}^{3+} \rightarrow \text{Sn}^{4+} + 2\text{Fe}^{2+}$
MCQ+1 / -02026
13Redox Reactions
Which of the following is NOT a redox reaction?
MCQ+1 / -02026
14Redox Reactions
What is oxidation state of oxygen in $\text{OF}_2$ and in $\text{KO}_2$ respectively?
MCQ+1 / -02026
15Redox Reactions
Find the oxidation number of Cl in $\text{ClO}_4^{-1}$
MCQ+1 / -02026
16Redox Reactions
In the equation, $\mathrm{BiO}_3^{-}+6 \mathrm{H}^{+}+x \mathrm{e}^{-} \rightarrow \mathrm{Bi}^{3+}+3 \mathrm{H}_2 \mathrm{O}$ What is the value of $x$ ?
MCQ+1 / -02025
17Redox Reactions
What is the oxidation number of carbon in methanal?
MCQ+1 / -02025
18Redox Reactions
What is the oxidation number of phosphorus in calcium phosphate?
MCQ+1 / -02025
19Redox Reactions
Which of the following species acts as an weakest reducing agent?
MCQ+1 / -02025
20Redox Reactions
What is the charge required to convert $2 \mathrm{~mol} \mathrm{KMnO}_4$ to $\mathrm{MnSO}_4$ ?
MCQ+1 / -02025
21Redox Reactions
What is oxidation number of sulphur in $\mathrm{SO}_3$ ?
MCQ+1 / -02025
22Redox Reactions
Identify correct statement for reaction stated below.
\(\mathrm{Ag}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O}+2 \mathrm{e}^{-} \longrightarrow 2 \mathrm{Ag}+2 \mathrm{OH}^{-}\)
\(\mathrm{Ag}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O}+2 \mathrm{e}^{-} \longrightarrow 2 \mathrm{Ag}+2 \mathrm{OH}^{-}\)
MCQ+1 / -02025
23Redox Reactions
For a reaction, $\mathrm{NH}_4 \mathrm{NO}_2 \longrightarrow \mathrm{~N}_2+2 \mathrm{H}_2 \mathrm{O}$. Which from following phenomena is true regarding nitrogen?
MCQ+1 / -02025
24Redox Reactions
What is the difference in oxidation number of Mn in $\mathrm{KMnO}_4$ and $\mathrm{MnO}_2$ ?
MCQ+1 / -02025
25Redox Reactions
Which of the following species acts as strongest oxidising agent?
MCQ+1 / -02025
26Redox Reactions
A compound of Xe and F is found to have atomic ratio $\mathrm{Xe}: \mathrm{F}$ as $0.4: 2.4$, Find the oxidation number of Xe ?
MCQ+1 / -02025
27Redox Reactions
If a reaction occurs in following two steps
i. $2 \mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_2^{-}$
ii. $\mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_3^{-}+\mathrm{Cl}^{-}$
Find the reaction intermediate.
i. $2 \mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_2^{-}$
ii. $\mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_3^{-}+\mathrm{Cl}^{-}$
Find the reaction intermediate.
MCQ+1 / -02025
28Redox Reactions
Which is NOT correct regarding stock notation?
MCQ+1 / -02025
29Redox Reactions
What is the number of electrons transferred considering Mn when $\mathrm{KMnO}_4$ is converted into $\mathrm{Mn}_2 \mathrm{O}_3$ ?
MCQ+1 / -02025
30Redox Reactions
Identify correct statement for the reaction.
\(\mathrm{I}_2+\mathrm{KClO}_3 \xrightarrow{\Delta} \mathrm{ICl}+\mathrm{KIO}_3\)
\(\mathrm{I}_2+\mathrm{KClO}_3 \xrightarrow{\Delta} \mathrm{ICl}+\mathrm{KIO}_3\)
MCQ+1 / -02025
31Redox Reactions
Which metal in following compounds is not present in fractional oxidation state?
MCQ+1 / -02025
32Redox Reactions
A compound contains atoms of $x, y$ and z elements. Oxidation numbers of $x, y$ and $z$ are +3 , +5 and -2 respectively. Identify the possible formula of this compound.
MCQ+1 / -02025
33Redox Reactions
What are the respective oxidation states of sulphur atoms numbered 1 to 4 in tetrathionate ion shown below?
MCQ+1 / -02025
34Redox Reactions
Which of the following is a redox reaction?
MCQ+1 / -02025
35Redox Reactions
What is the value of $x$ and $y$ in order to balance following redox reaction?
\(\mathrm{xCuO}+\mathrm{yNH}_3 \longrightarrow \mathrm{xCu}+\mathrm{N}_2+\mathrm{xH}_2 \mathrm{O}\)
\(\mathrm{xCuO}+\mathrm{yNH}_3 \longrightarrow \mathrm{xCu}+\mathrm{N}_2+\mathrm{xH}_2 \mathrm{O}\)
MCQ+1 / -02024
36Redox Reactions
Which of the following changes involves transfer of 5 electrons?
MCQ+1 / -02024
37Redox Reactions
Which compound from following contains iodine with highest oxidation number?
MCQ+1 / -02024
38Redox Reactions
What is the oxidation state of S in $\mathrm{SO}_4^{2-}$ ?
MCQ+1 / -02024
39Redox Reactions
Identify the element reduced in following reaction.
\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \longrightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{H}_2 \mathrm{O}+3 \mathrm{I}_2\)
\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \longrightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{H}_2 \mathrm{O}+3 \mathrm{I}_2\)
MCQ+1 / -02024
40Redox Reactions
In which of the following compounds chlorine has highest oxidation state?
MCQ+1 / -02024
41Redox Reactions
What is the oxidation number of underlined species in $\mathrm{PF}_6^{-}$and $\mathrm{V}_2 \mathrm{O}_7^{-4}$ ions respectively?
MCQ+1 / -02024
42Redox Reactions
What is the oxidation state of phosphorus in phosphate ion?
MCQ+1 / -02024
43Redox Reactions
What is the oxidation number of Mn in $\mathrm{MnO}_4^{-}$?
MCQ+1 / -02024
44Redox Reactions
Calculate the oxidation number of Cr in $\mathrm{CrO}_4^{2-}$ ion and $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ respectively.
MCQ+1 / -02024
45Redox Reactions
What is change in oxidation number of nitrogen when $\mathrm{NO}_3^{-}$is converted to $\mathrm{NH}_4^{+}$ion?
MCQ+1 / -02024
46Redox Reactions
What is oxidation number of S in $\mathrm{SO}_3^{2-}$ ?
MCQ+1 / -02024
47Redox Reactions
Identify the correct statement for following reaction.
\(3 \mathrm{Mg}+\mathrm{N}_2 \longrightarrow \mathrm{Mg}_3 \mathrm{~N}_2\)
\(3 \mathrm{Mg}+\mathrm{N}_2 \longrightarrow \mathrm{Mg}_3 \mathrm{~N}_2\)
MCQ+1 / -02024
48Redox Reactions
What is the oxidation number of carbon in $\mathrm{K}_2 \mathrm{C}_2 \mathrm{O}_4 ?$
MCQ+1 / -02024
49Redox Reactions
What is the oxidation state of iodine in $\mathrm{I}_2 \mathrm{Cl}_6$ ?
MCQ+1 / -02024
50Redox Reactions
What is the change in oxidation number of S in following reaction?
\(\mathrm{H}_2 \mathrm{~S}+\mathrm{NO}_3^{-} \longrightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{NO}+\mathrm{S}\)
\(\mathrm{H}_2 \mathrm{~S}+\mathrm{NO}_3^{-} \longrightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{NO}+\mathrm{S}\)
MCQ+1 / -02024