Redox Reactions · Chemistry · JEE Main

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MCQ (Single Correct Answer)

JEE Main 2024 (Online) 1st February Morning Shift
Which of the following reactions are disproportionation reactions? (A) $\mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}$ (B) $3 \mathrm{MnO}_...
JEE Main 2024 (Online) 1st February Morning Shift
In acidic medium, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ shows oxidising action as represented in the half reaction: $$ \mathrm{Cr}_2 \mathrm{O}_7{...
JEE Main 2024 (Online) 29th January Morning Shift
Chlorine undergoes disproportionation in alkaline medium as shown below : $$\mathrm{aCl}_{2(\mathrm{~g})}+\mathrm{b} \mathrm{OH}_{(\mathrm{aq})}^{-} \...
JEE Main 2024 (Online) 29th January Morning Shift
In alkaline medium, $$\mathrm{MnO}_4^{-}$$ oxidises $$\mathrm{I}^{-}$$ to
JEE Main 2024 (Online) 27th January Evening Shift
Which of the following cannot function as an oxidising agent?
JEE Main 2023 (Online) 8th April Evening Shift
Given below are two statements: Statement I : In redox titration, the indicators used are sensitive to change in $$\mathrm{pH}$$ of the solution. Stat...
JEE Main 2023 (Online) 8th April Morning Shift
$$2 \mathrm{IO}_{3}^{-}+x \mathrm{I}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}$$ What is the value of $$x$$ ?...
JEE Main 2023 (Online) 6th April Morning Shift
Which of the following options are correct for the reaction $$2\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rig...
JEE Main 2022 (Online) 29th July Evening Shift
A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with $$\mathrm{CH}_{3} ...
JEE Main 2022 (Online) 26th July Evening Shift
Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$. Assertion A: Phenolpht...
JEE Main 2022 (Online) 26th July Morning Shift
Which of the given reactions is not an example of disproportionation reaction?
JEE Main 2022 (Online) 26th June Evening Shift
Which one of the following is an example of disproportionation reaction ?
JEE Main 2021 (Online) 27th July Morning Shift
The oxidation states of 'P' in H4P2O7, H4P2O5 and H4P2O6, respectively, are :...
JEE Main 2021 (Online) 25th July Evening Shift
Identify the process in which change in the oxidation state is five :
JEE Main 2021 (Online) 18th March Evening Shift
The oxidation states of nitrogen in NO, NO2, N2O and NO$$_3^ - $$ are in the order of :
JEE Main 2021 (Online) 16th March Evening Shift
Statement I : Sodium hydride can be used as an oxidising agent.Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.Choose...
JEE Main 2020 (Online) 2nd September Morning Slot
While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?
JEE Main 2020 (Online) 9th January Morning Slot
The compound that cannot act both as oxidising and reducing agent is :
JEE Main 2020 (Online) 7th January Evening Slot
The redox reaction among the following is :
JEE Main 2020 (Online) 7th January Morning Slot
Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :
JEE Main 2019 (Online) 12th April Morning Slot
An example of a disproportionation reaction is :
JEE Main 2019 (Online) 9th April Morning Slot
The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is :
JEE Main 2019 (Online) 8th April Morning Slot
In order to oxidise a mixture of one mole of each of FeC2O4, Fe2(C2O4)3, FeSO4 and Fe2(SO4)3 in acidic medium, the number of moles of KMnO4 required i...
JEE Main 2019 (Online) 12th January Morning Slot
50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solut...
JEE Main 2019 (Online) 12th January Morning Slot
The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3 M CaSO4 is (Molar mass of CaSO4 = 136 g mol–1) ...
JEE Main 2019 (Online) 10th January Evening Slot
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is :
JEE Main 2017 (Offline)
Which of the following reactions is an example of a redox reaction?
JEE Main 2016 (Online) 10th April Morning Slot
The volume of 0.1N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is :
JEE Main 2014 (Offline)
In which of the following reactions H2O2 acts as a reducing agent? 1. H2O2 + 2H+ + 2e- $$\to$$ 2H2O 2. H2O2 - 2e- $$\to$$ O2 + 2H+ 3. H2O2 + 2e- $$\to...
JEE Main 2013 (Offline)
Consider the following reaction: $$xMnO_4^- + yC_2O_4^{2-}$$ + zH+ $$\to$$ xMn2+ + 2yCO2 + $${z \over 2}{H_2}O$$ The value's of x, y and z in the reac...
AIEEE 2006
Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?
AIEEE 2002
Which of the following is a redox reaction ?

Numerical

JEE Main 2024 (Online) 31st January Evening Shift
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $$(+)$$ _...
JEE Main 2024 (Online) 31st January Evening Shift
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 ...
JEE Main 2024 (Online) 30th January Evening Shift
Total number of species from the following which can undergo disproportionation reaction is ________. $$\mathrm{H}_2 \mathrm{O}_2, \mathrm{ClO}_3^{-},...
JEE Main 2024 (Online) 30th January Morning Shift
$$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}$$ If th...
JEE Main 2024 (Online) 29th January Evening Shift
The oxidation number of iron in the compound formed during brown ring test for NO$$_3^-$$ iron is ________.
JEE Main 2023 (Online) 13th April Evening Shift
See the following chemical reaction: $$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mat...
JEE Main 2023 (Online) 10th April Evening Shift
In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.
JEE Main 2023 (Online) 8th April Evening Shift
The sum of oxidation state of the metals in $$\mathrm{Fe}(\mathrm{CO})_{5}, \mathrm{VO}^{2+}$$ and $$\mathrm{WO}_{3}$$ is ___________.
JEE Main 2023 (Online) 6th April Morning Shift
In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________
JEE Main 2023 (Online) 1st February Morning Shift
Sum of oxidation states of bromine in bromic acid and perbromic acid is ___________.
JEE Main 2023 (Online) 31st January Morning Shift
The oxidation state of phosphorus in hypophosphoric acid is + _____________.
JEE Main 2023 (Online) 25th January Morning Shift
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...
JEE Main 2022 (Online) 27th July Evening Shift
The normality of $$\mathrm{H}_{2} \mathrm{SO}_{4}$$ in the solution obtained on mixing $$100 \mathrm{~mL}$$ of $$0.1 \,\mathrm{M} \,\mathrm{H}_{2} \ma...
JEE Main 2022 (Online) 26th July Evening Shift
$$20 \mathrm{~mL}$$ of $$0.02\, \mathrm{M}$$ hypo solution is used for the titration of $$10 \mathrm{~mL}$$ of copper sulphate solution, in the presen...
JEE Main 2022 (Online) 28th June Evening Shift
0.01 M KMnO4 solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume ...
JEE Main 2022 (Online) 25th June Evening Shift
The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is __________...
JEE Main 2021 (Online) 27th July Evening Shift
10.0 mL of 0.05 M KMnO4 solution was consumed in a titration with 10.0 mL of given oxalic acid dihydrate solution. The strength of given oxalic acid s...
JEE Main 2021 (Online) 26th February Morning Shift
Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.
JEE Main 2021 (Online) 25th February Morning Shift
0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with $${N \over {10}}$$ HCl using phenolphthalein as an indicator, 17.5 mL ...
JEE Main 2020 (Online) 5th September Evening Slot
The volume, in mL, of 0.02 M K2Cr2O7 solution required to react with 0.288 g of ferrous oxalate in acidic medium is _______. (Molar mass of Fe = 56 g ...
JEE Main 2020 (Online) 4th September Evening Slot
A 100 mL solution was made by adding 1.43 g of Na2CO3.xH2O. The normality of the solution is 0.1 N. The value of x is _____. (The atomic mass of Na is...
JEE Main 2020 (Online) 2nd September Evening Slot
The oxidation states of transition metal atoms in K2Cr2O7, KMnO4 and K2FeO4, respectively, are x, y and z. The sum of x, y and z is _______....
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