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Redox Reactions PYQs - Last 5 Years

JEE Main / Chemistry / Physical Chemistry / 48 recent questions

ChemistryPhysical Chemistry2022-2026
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Practice 48 JEE Main 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
2022-2026
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2022-2026
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2017-2026

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48PYQs
MCQ52.1%
INTEGER47.9%

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Last 5 Years Redox Reactions Questions

Showing 48 of 48 filtered questions.

1Redox Reactions
500 mL of $0.2 \mathrm{M} \mathrm{MnO}_4^{-}$solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard $x \mathrm{M}$ thio...
INTEGER+4 / -12026
2Redox Reactions
In order to oxidise a mixture of 1 mole each of $\mathrm{FeC}_2 \mathrm{O}_4, \mathrm{Fe}_2\left(\mathrm{C}_2 \mathrm{O}_4\right)_3, \mathrm{FeSO}_4$ and $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3$ in acidic medium, the number of moles of $...
MCQ+4 / -12026
3Redox Reactions
Given below are two statements: Statement (I): Oxidising power of halogens decreases in the order $F_2 > Cl_2 > Br_2 > I_2$, which is the basis of "Layer test". Statement (II): "Layer test" to identify $Br_2$ and $I_2$ in aqueous solution i...
MCQ+4 / -12026
4Redox Reactions
500 mL of 1.2 M KI solution is mixed with 500 mL of $0.2 \mathrm{M} \mathrm{KMnO}_4$ solution in basic medium. The liberated iodine was titrated with standard $0.1 \mathrm{M} \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ solution in the presenc...
INTEGER+4 / -12026
5Redox Reactions
X and Y are the number of electrons involved, respectively during the oxidation of $\mathrm{I}^{-}$to $\mathrm{I}_2$ and $\mathrm{S}^{2-}$ to S by acidified $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$. The value of $\mathrm{X}+\mathrm{Y}$ is ...
INTEGER+4 / -12026
6Redox Reactions
One mole of $\mathrm{Cl}_2(\mathrm{~g})$ was passed into 2 L of cold 2 M KOH solution. After the reaction, the concentrations of $\mathrm{Cl}^{-}, \mathrm{ClO}^{-}$and $\mathrm{OH}^{-}$are respectively (assume volume remains constant)
MCQ+4 / -12026
7Redox Reactions
200 cc of $x \times 10^{-3} \mathrm{M}$ potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium.
Here $x=$ $\_\_\_\_$ .
INTEGER+4 / -12026
8Redox Reactions
The oxidation state of chromium in the final product formed in the reaction between KI and acidified $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ solution is :
MCQ+4 / -12026
9Redox Reactions
$\mathrm{KMnO}_4$ acts as an oxidising agent in acidic medium. ' X ' is the difference between the oxidation states of Mn in reactant and product. ' Y ' is the number of ' d ' electrons present in the brown red precipitate formed at the end...
INTEGER+4 / -12025
10Redox Reactions
0.1 M solution of KI reacts with excess of $\mathrm{H}_2 \mathrm{SO}_4$ and $\mathrm{KIO}_3$ solutions. According to equation
\(5 \mathrm{I}^{-}+\mathrm{IO}_3^{-}+6 \mathrm{H}^{+} \rightarrow 3 \mathrm{I}_2+3 \mathrm{H}_2 \mathrm{O}\)
Ide...
MCQ+4 / -12025
11Redox Reactions
Which of the following oxidation reactions are carried out by both $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and $\mathrm{KMnO}_4$ in acidic medium?
A. $\Gamma^{-} \rightarrow \mathrm{I}_2$
B. $\mathrm{S}^{2-} \rightarrow \mathrm{S}$
C. $\m...
MCQ+4 / -12025
12Redox Reactions
Match the List - I with List - II

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MCQ+4 / -12025
13Redox Reactions
Given below are two statements:
Statement I: In the oxalic acid vs $\mathrm{KMnO}_4$ (in the presence of dil $\mathrm{H}_2 \mathrm{SO}_4$ ) titration the solution needs to be heated initially to $60^{\circ} \mathrm{C}$, but no heating is re...
MCQ+4 / -12025
14Redox Reactions
Some $\mathrm{CO}_2$ gas was kept in a sealed container at a pressure of 1 atm and at 273 K . This entire amount of $\mathrm{CO}_2$ gas was later passed through an aqueous solution of $\mathrm{Ca}(\mathrm{OH})_2$. The excess unreacted $\mat...
INTEGER+4 / -12025
15Redox Reactions
The species which does not undergo disproportionation reaction is :
MCQ+4 / -12025
16Redox Reactions
Thiosulphate reacts differently with iodine and bromine in the reactions given below:
$$\begin{aligned}
& 2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-} \\
& \mathrm{S}_2 \mathrm{O...
MCQ+4 / -12024
17Redox Reactions
Match List I with List II.

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MCQ+4 / -12024
18Redox Reactions
The number of ions from the following that are expected to behave as oxidising agent is :
\(\mathrm{Sn}^{4+}, \mathrm{Sn}^{2+}, \mathrm{Pb}^{2+}, \mathrm{Tl}^{3+}, \mathrm{Pb}^{4+}, \mathrm{Tl}^{+}\)
MCQ+4 / -12024
19Redox Reactions
Only \(2 \mathrm{~mL}\) of \(\mathrm{KMnO}_4\) solution of unknown molarity is required to reach the end point of a titration of \(20 \mathrm{~mL}\) of oxalic acid \((2 \mathrm{M})\) in acidic medium. The molarity of \(\mathrm{KMnO}_4\) sol...
INTEGER+4 / -12024
20Redox Reactions
When \(\mathrm{MnO}_2\) and \(\mathrm{H}_2 \mathrm{SO}_4\) is added to a salt \((\mathrm{A})\), the greenish yellow gas liberated as salt (A) is :
MCQ+4 / -12024
21Redox Reactions
Number of moles of \(\mathrm{H}^{+}\) ions required by \(1 \mathrm{~mole}\) of \(\mathrm{MnO}_4^{-}\) to oxidise oxalate ion to \(\mathrm{CO}_2\) is _________.
INTEGER+4 / -12024
22Redox Reactions
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is \((+)\) _________.
INTEGER+4 / -12024
23Redox Reactions
\(2 \mathrm{MnO}_4^{-}+\mathrm{bI}^{-}+\mathrm{cH}_2 \mathrm{O} \rightarrow x \mathrm{I}_2+y \mathrm{MnO}_2+z \overline{\mathrm{O}} \mathrm{H}\)
If the above equation is balanced with integer coefficients, the value of \(z\) is ________.
INTEGER+4 / -12024
24Redox Reactions
Total number of species from the following which can undergo disproportionation reaction is ________.
$$\mathrm{H}_2 \mathrm{O}_2, \mathrm{ClO}_3^{-}, \mathrm{P}_4, \mathrm{Cl}_2, \mathrm{Ag}, \mathrm{Cu}^{+1}, \mathrm{~F}_2, \mathrm{NO}_2,...
INTEGER+4 / -12024
25Redox Reactions
In alkaline medium, \(\mathrm{MnO}_4^{-}\) oxidises \(\mathrm{I}^{-}\) to
MCQ+4 / -12024
26Redox Reactions
Chlorine undergoes disproportionation in alkaline medium as shown below :
$$\mathrm{aCl}_{2(\mathrm{~g})}+\mathrm{b} \mathrm{OH}_{(\mathrm{aq})}^{-} \rightarrow \mathrm{c} \mathrm{ClO}_{(\mathrm{aq)}}^{-}+\mathrm{d} \mathrm{Cl}_{(\mathrm{aq...
MCQ+4 / -12024
27Redox Reactions
The oxidation number of iron in the compound formed during brown ring test for NO\(_3^-\) iron is ________.
INTEGER+4 / -12024
28Redox Reactions
Which of the following cannot function as an oxidising agent?
MCQ+4 / -12024
29Redox Reactions
In acidic medium, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ shows oxidising action as represented in the half reaction:
$$
\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{\ominus} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_2 \mat...
MCQ+4 / -12024
30Redox Reactions
Which of the following reactions are disproportionation reactions?
(A) $\mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}$
(B) $3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2...
MCQ+4 / -12024
31Redox Reactions
\(2 \mathrm{IO}_{3}^{-}+x \mathrm{I}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of \(x\) ?
MCQ+4 / -12023
32Redox Reactions
The sum of oxidation state of the metals in \(\mathrm{Fe}(\mathrm{CO})_{5}, \mathrm{VO}^{2+}\) and \(\mathrm{WO}_{3}\) is ___________.
INTEGER+4 / -12023
33Redox Reactions
Given below are two statements:
Statement I : In redox titration, the indicators used are sensitive to change in \(\mathrm{pH}\) of the solution.
Statement II : In acid-base titration, the indicators used are sensitive to change in oxidatio...
MCQ+4 / -12023
34Redox Reactions
In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________
INTEGER+4 / -12023
35Redox Reactions
Which of the following options are correct for the reaction
$$2\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rightarrow 2 \mathrm{Au}(\mathrm{s})+\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}(\mathrm{a...
MCQ+4 / -12023
36Redox Reactions
The oxidation state of phosphorus in hypophosphoric acid is + _____________.
INTEGER+4 / -12023
37Redox Reactions
The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is __________ \(\times\) 10\(^{-2}\) mL (Nearest integer)
INTEGER+4 / -12023
38Redox Reactions
Sum of oxidation states of bromine in bromic acid and perbromic acid is ___________.
INTEGER+4 / -12023
39Redox Reactions
See the following chemical reaction:
\(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mathrm{~F}_{e}^{3+}+\mathrm{Z} \mathrm{H}_{2} \mathrm{O}\)
The sum of $$\mathrm{X}, \mathrm{Y...
INTEGER+4 / -12023
40Redox Reactions
In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.
INTEGER+4 / -12023
41Redox Reactions
A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with \(\mathrm{CH}_{3} \mathrm{COOH}\). Compound 'X' exists in ionized form in basic medium. The compound 'X' is
MCQ+4 / -12022
42Redox Reactions
0.01 M KMnO4 solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of KMnO4 solution left in the burette after the end point is _____________ mL. (nearest in...
INTEGER+4 / -12022
43Redox Reactions
The normality of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) in the solution obtained on mixing \(100 \mathrm{~mL}\) of \(0.1 \,\mathrm{M} \,\mathrm{H}_{2} \mathrm{SO}_{4}\) with \(50 \mathrm{~mL}\) of \(0.1 \,\mathrm{M}\, \mathrm{NaOH}\) is _______...
INTEGER+4 / -12022
44Redox Reactions
Which one of the following is an example of disproportionation reaction ?
MCQ+4 / -12022
45Redox Reactions
Which of the given reactions is not an example of disproportionation reaction?
MCQ+4 / -12022
46Redox Reactions
\(20 \mathrm{~mL}\) of \(0.02\, \mathrm{M}\) hypo solution is used for the titration of \(10 \mathrm{~mL}\) of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of \(\mathrm{Cu}^{2+}\) is f...
INTEGER+4 / -12022
47Redox Reactions
Given below are two statements: one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\).
Assertion A: Phenolphthalein is a \(\mathrm{pH}\) dependent indicator, remains colourless in acidic solution and...
MCQ+4 / -12022
48Redox Reactions
The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is __________.
[M is a metal]
INTEGER+4 / -12022