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Balancing redox equations in acidic and basic media

35 questions on Balancing redox equations in acidic and basic media from the Redox Reactions chapter: 6 NEET level, 13 JEE Main, 16 JEE Advanced. Each one opens with its answer and solution.

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In acidic medium permanganate oxidises oxalate to carbon dioxide. The mole ratio n(MnO4^-) : n(C2O4^2-) that react is JEE Main level
In basic solution stannite reduces bismuth(III) hydroxide to bismuth: Bi(OH)3 + SnO2^2- -> Bi + SnO3^2- + H2O. In the balanced equation (smallest whole numbers)... JEE Main level
Balance the equation MnO4^- + C2O4^2- + H^+ -> Mn^2+ + CO2 + H2O in acidic medium using the smallest whole-number coefficients. Find the sum of the coefficients... JEE Main level
In acidic medium Cu2S is oxidised by nitrate to Cu^2+ and SO4^2- while nitrate is reduced to NO. The number of moles of NO3^- consumed per mole of Cu2S is JEE Advanced level
In acidic medium the reaction MnO4^- + Fe^2+ + H^+ -> Mn^2+ + Fe^3+ + H2O is balanced with the smallest whole-number coefficients. The coefficient of Fe^2+ is NEET level
A sample of 1.44 g of ferrous oxalate, FeC2O4 (Fe 56, C 12, O 16), is titrated in hot acidic solution with 0.020 M KMnO4. Both Fe^2+ and oxalate are oxidised (t... JEE Advanced level
Chlorine (7.1 g) is passed into hot concentrated NaOH, where it is converted completely into chloride and chlorate: Cl2 + OH^- -> Cl^- + ClO3^- + H2O. Balance t... JEE Advanced level
Which of the following half-reactions (acidic medium) are correctly balanced in both atoms and charge? JEE Main level
Thiosulphate is oxidised to sulphate by chlorine water: S2O3^2- + Cl2 + H2O -> SO4^2- + Cl^- + H^+. Balance with the smallest whole numbers and give the sum of ... JEE Main level
Peroxydisulphate oxidises manganese(II) in water: S2O8^2- + Mn^2+ + H2O -> MnO4^- + SO4^2- + H^+. In the balanced equation, the number of moles of H^+ produced ... JEE Advanced level
In acidic medium As2S3 is oxidised by nitrate: As2S3 + NO3^- + H2O -> AsO4^3- + SO4^2- + NO + H^+. Find the sum of all coefficients in the balanced equation wri... JEE Advanced level
For the acidic reaction Cr2O7^2- + SO3^2- + H^+ -> Cr^3+ + SO4^2- + H2O balanced with smallest whole numbers, select ALL correct statements. JEE Advanced level
Hydroxylamine reduces Fe^3+ and is itself oxidised to N2O: NH2OH + Fe^3+ -> N2O + Fe^2+ + H^+ + H2O. The n-factor of NH2OH in this reaction is JEE Advanced level
In alkaline medium KMnO4 is reduced to MnO2. Taking molar mass of KMnO4 as 158 g/mol (K 39, Mn 55, O 16), find its equivalent mass in this reaction. Give the an... JEE Main level
In basic medium manganese dioxide is oxidised by chlorate: MnO2 + ClO3^- + OH^- -> MnO4^2- + Cl^- + H2O. The sum of all coefficients (smallest whole numbers, re... JEE Advanced level
Use average oxidation numbers of sulphur. Select ALL correct statements about thiosulphate S2O3^2-. JEE Advanced level
In alkaline medium oxalate is oxidised to carbonate by permanganate, which is reduced to MnO2. The balanced equation (smallest whole numbers) contains OH^- with... JEE Advanced level
Zinc reduces nitrate to ammonium ion in acidic solution: Zn + NO3^- + H^+ -> Zn^2+ + NH4^+ + H2O. Balance with the smallest whole numbers and give the sum of al... JEE Main level
White phosphorus disproportionates in alkaline solution: P4 + OH^- + H2O -> PH3 + H2PO2^-. Balance the equation and calculate the mass of PH3 formed from 12.4 g... JEE Advanced level
For the reaction Cr2O7^2- + Fe^2+ + H^+ -> Cr^3+ + Fe^3+ + H2O in acidic medium, the coefficient of H^+ in the balanced equation (smallest whole numbers) is NEET level
In basic medium hydrogen peroxide reduces chlorine dioxide: ClO2 + H2O2 + OH^- -> ClO2^- + O2 + H2O. The sum of all coefficients (smallest whole numbers, reacta... JEE Main level
Acidified KMnO4 oxidises Fe^2+ to Fe^3+ and is itself reduced to Mn^2+. Calculate the mass of KMnO4 required to oxidise 11.2 g of Fe^2+ ions completely. Atomic ... JEE Main level
Nitrous acid disproportionates: HNO2 -> HNO3 + NO + H2O. Balance the equation and calculate the volume of NO at STP obtained from 9.4 g of HNO2. Atomic masses: ... JEE Advanced level
For the reaction 2MnO4^- + 5H2O2 + 6H^+ -> 2Mn^2+ + 5O2 + 8H2O, select ALL correct statements. JEE Advanced level
Copper (6.35 g) is dissolved completely in excess dilute nitric acid, which is reduced to NO. Use the balanced ionic equation to find the volume of NO released ... JEE Main level
In acidic medium FeC2O4 is oxidised by MnO4^-, with Fe^2+ going to Fe^3+ and oxalate going to CO2. The n-factor of FeC2O4 in this reaction is JEE Main level
In basic medium the reaction MnO4^- + I^- -> MnO2 + I2 is balanced with H2O and OH^-. In the balanced equation (smallest whole numbers) the coefficient of OH^- ... NEET level
Copper reacts with dilute nitric acid: Cu + HNO3 -> Cu(NO3)2 + NO + H2O. In the balanced equation (smallest whole numbers) the coefficient of HNO3 is NEET level
In basic medium aluminium reduces nitrate to ammonia: Al + NO3^- + OH^- + H2O -> [Al(OH)4]^- + NH3. Balance with the smallest whole numbers and give the sum of ... JEE Main level
Magnetite Fe3O4 (containing Fe^2+ and Fe^3+) is completely oxidised by an oxidising agent to Fe2O3, that is, all iron ends as Fe^3+. The n-factor of Fe3O4 in th... JEE Advanced level
Sulphur dioxide reduces permanganate in acidic solution: MnO4^- + SO2 + H2O -> Mn^2+ + SO4^2- + H^+. In the balanced equation (smallest whole numbers) the coeff... JEE Main level
In basic medium Cr(OH)3 is oxidised by chlorate: Cr(OH)3 + ClO3^- + OH^- -> CrO4^2- + Cl^- + H2O. In the balanced equation (smallest whole numbers) find the sum... JEE Advanced level
In the half-reaction Cr2O7^2- arrow Cr^3+ in acidic medium, the number of H2O molecules formed per Cr2O7^2- in the balanced half-reaction is NEET level
In alkaline medium permanganate is reduced to MnO2. The number of electrons gained by one MnO4^- ion in this half-reaction is NEET level
Permanganate oxidises iodide to iodate in basic medium: MnO4^- + I^- -> MnO2 + IO3^-. For the balanced equation with smallest whole numbers, select ALL correct ... JEE Advanced level