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Oxidising and reducing agents, disproportionation

20 questions on Oxidising and reducing agents, disproportionation from the Redox Reactions chapter: 5 NEET level, 9 JEE Main, 6 JEE Advanced. Each one opens with its answer and solution.

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Select ALL species that can act ONLY as reducing agents (judge by the oxidation state of the non-hydrogen element). JEE Main level
In the reaction SnCl2 + 2HgCl2 -> SnCl4 + Hg2Cl2, the reducing agent and the reduced product are respectively JEE Main level
On heating, phosphorous acid disproportionates: 4H3PO3 -> 3H3PO4 + PH3. The ratio of the number of P atoms oxidised to the number reduced is JEE Advanced level
In the acidic reaction 2MnO4^- + 5H2O2 + 6H^+ -> 2Mn^2+ + 5O2 + 8H2O, hydrogen peroxide acts as NEET level
Which of the following is a disproportionation reaction? NEET level
Which of the following are disproportionation reactions? JEE Main level
Select ALL correct statements. JEE Advanced level
Considering only the oxidation state of chlorine, which of the following ions CANNOT act as a reducing agent? JEE Main level
Select ALL species that can act both as an oxidising agent and as a reducing agent (judge by the oxidation state of the non-hydrogen element, in suitable reacti... JEE Main level
Sulphur disproportionates in hot alkali: S + OH^- -> S^2- + SO3^2- + H2O. For the balanced equation with smallest whole numbers, the total number of electrons t... JEE Advanced level
Judging by the oxidation state of the non-hydrogen element, which of the following can act ONLY as a reducing agent? NEET level
Hot concentrated alkali converts chlorine as 3Cl2 + 6OH^- -> 5Cl^- + ClO3^- + 3H2O. Select ALL correct statements. JEE Advanced level
Manganate disproportionates in acid: 3MnO4^2- + 4H^+ -> 2MnO4^- + MnO2 + 2H2O. The fraction of the manganate (Mn(VI)) that is oxidised to permanganate is JEE Advanced level
Which of the following is NOT a disproportionation reaction? JEE Main level
Assertion (A): Hydrogen peroxide can act both as an oxidising agent and as a reducing agent. Reason (R): Oxygen in H2O2 has oxidation number -1, which lies betw... JEE Main level
Acidified potassium iodate reacts with excess potassium iodide: iodine in two different oxidation states (+5 and -1) forms iodine (0), IO3^- + I^- + H^+ -> I2 +... JEE Advanced level
Which of the following species can act ONLY as an oxidising agent (judge by the oxidation state of sulphur)? NEET level
In the reaction Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O, what fraction of the nitric acid consumed acts as the oxidising agent? JEE Main level
In the reaction Zn + Cu^2+ -> Zn^2+ + Cu, the oxidising agent is NEET level
Under suitable conditions (for example on heating or in alkaline solution) which of the following chlorine oxoanions can undergo disproportionation? JEE Main level