JEE Main
Redox Reactions
Previous Years Questions


Sum of oxidation states of bromine in bromic acid and perbromic acid is ___________.
The oxidation state of phosphorus in hypophosphoric acid is + _____________.
Consider the following sulphur based oxoacids. $$\mathrm{H}_{2} \mathrm{SO}_{3}, \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{H}_{2} \mathrm{S}_{2} \mathrm...
The disproportionation of $$\mathrm{MnO}_{4}^{2-}$$ in acidic medium resulted in the formation of two manganese compounds $$\mathrm{A}$$ and $$\mathrm...
The normality of $$\mathrm{H}_{2} \mathrm{SO}_{4}$$ in the solution obtained on mixing $$100 \mathrm{~mL}$$ of $$0.1 \,\mathrm{M} \,\mathrm{H}_{2} \ma...
0.01 M KMnO4 solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume ...
The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is __________...
The difference in oxidation state of chromium in chromate and dichromate salts is ___________.
In mildly alkaline medium, thiosulphate ion is oxidized by $$MnO_4^ - $$ to "A". The oxidation state of sulphur in "A" is __________.
Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.

MCQ (Single Correct Answer)

In neutral or faintly alkaline medium, $$\mathrm{KMnO}_{4}$$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In...
Which of the given reactions is not an example of disproportionation reaction?
The dark purple colour of $$\mathrm{KMnO}_{4}$$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation num...
Among the following, basic oxide is :
Which one of the following is an example of disproportionation reaction ?
Experimentally reducing a functional group cannot be done by which one of the following reagents?
In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively :5Fe2+ + MnO$$_4^ - $$ + 8H+ $$\to$$ Mn2+ + 4H2O + 5Fe3+...
In which one of the following sets all species show disproportionation reaction?
Potassium permanganate on heating at 513 K gives a product which is :
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
The incorrect statement is :
The oxidation states of 'P' in H4P2O7, H4P2O5 and H4P2O6, respectively, are :...
Match List - I with List - II : List - I List - II (a) NaOH (i) Acidic (b) $$Be{(OH)_2}$$ ...
Identify the process in which change in the oxidation state is five :
The oxidation states of nitrogen in NO, NO2, N2O and NO$$_3^ - $$ are in the order of :
The set that represents the pair of neutral oxides of nitrogen is :
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...
Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :
Which of the following equation depicts the oxidizing nature of H2O2?
The incorrect statement among the following is :
The compound that cannot act both as oxidising and reducing agent is :
The redox reaction among the following is :
An example of a disproportionation reaction is :
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...
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is :
In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?
Which of the following reactions is an example of a redox reaction?
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- $$\to...
Consider the following reaction: $$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...
Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?
Which of the following is a redox reaction ?
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