Difficulty distribution
How the classified questions are distributed by difficulty.
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Practice Redox Reaction - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
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Year-wise coverage for Redox Reaction. Each bar uses a separate theme-derived color.
How the classified questions are distributed by difficulty.
MCQ, numerical, multiple-select and other formats found in these papers.
Top subjects by unique question coverage.
Top topics across the included previous year papers.
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Question coverage for the most populated papers. Every active PYP paper remains listed below.
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| WB JEE 2025 | 2025 | 2 | View paper |
| WB JEE 2024 | 2024 | 1 | View paper |
| WB JEE 2023 | 2023 | 1 | View paper |
| WB JEE 2022 | 2022 | 1 | View paper |
| WB JEE 2021 | 2021 | 2 | View paper |
| WB JEE 2017 | 2017 | 3 | View paper |
Practice every matching question in batches of 20, with every available option.
Oxidation states of Cr in K2Cr2O7 and CrO5 are respectively
The equivalent weight of KIO\(_3\) in the given reaction is (M = molecular mass):
$$\mathrm{2Cr{(OH)_3} + 4O{H^ - } + KI{O_3} \to 2CrO_4^{2 - } + 5{H_2}O + KI}$$
The equivalent weight of \(\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3(\mathrm{Gram}\) molecular weight \(=\mathrm{M})\) in the given reaction is
$$\mathrm{I}_2+2 \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3=2 \mathrm{NaI}+\mathrm{Na}_2 \mathrm{~S}_4 \mathrm{O}_6$$
What is the four-electron reduced form of $\mathrm{O}_2$ ?
How many electrons are needed to reduce $\mathrm{N}_2$ to $\mathrm{NH}_3 ?$