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JEE Main Redox and Electrochemistry questions

18 Chemistry questions on Redox and Electrochemistry as asked in JEE Main, newest first. 9 come with a worked solution.

  1. Which one among the following metals is the weakest reducing agent?

    2023 · with solution

  2. Following figure shows dependence of molar conductance of two electrolytes on concentration. Am is the limiting molar conductance. The number of incorrect statement(s) from the following is ______ (A) Am for electrolyte…

    2023 · with solution

  3. At 298 K, a 1 litre solution containing 10 mmol of Cr_2O_7^2- and 100 mmol of Cr^3+ shows a pH of 3.0. Given: Cr_2O_7^2- arrow Cr^3+; E° = 1.330V and (2.303 RT)/F = 0.059 V The potential for the half cell reaction is x…

    2023 · with solution

  4. Consider the cell Pt(s) mid H_2(g) (1 atm) mid H^+(aq, [H^+]=1) ∥ Fe^3+(aq), Fe^2+(aq) mid Pt(s) Given E°_Fe^3+/Fe^2+ = 0.771 V and E°_H^+/1/2H_2 = 0 V, T = 298 K If the potential of the cell is 0.712 V, the ratio of…

    2023

  5. When Fe_0.93O is heated in presence of oxygen, it converts to Fe_2O_3. The number of correct statement/s from the following is __________ A. The equivalent weight of Fe_0.93O is dfracMolecular weight0.79 B. The number…

    2023 · with solution

  6. Pt(s)|H_2(g)(1 bar)|H^+(aq)(1 M)||M^3+(aq),M^2+(aq)|Pt(s) The E_cell for the given cell is 0.1115 V at 298 K when dfrac[M^2+(aq)][M^3+(aq)] = 10^a The value of a is ___________ Given : E^θ_M^3+/M^2+ = 0.2 V 2.303RT/F =…

    2023 · with solution

  7. An example of a disproportionation reaction is

    2019

  8. In order to oxidise a mixture of one mole of each of FeC_2O_4, Fe_2(C_2O_4)_3, FeSO_4 and Fe_2(SO_4)_3 in acidic medium, the number of moles of KMnO_4 required is

    2019

  9. In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO_2 is

    2019 · with solution

  10. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

    2007

  11. In the standardisation of Na_2S_2O_3 using K_2Cr_2O_7 by iodometry, the equivalent weight of K_2Cr_2O_7 is

    2001

  12. The reaction, 3ClO^-(aq) → ClO_3^-(aq) + 2Cl^-(aq) is an example of

    2001 · with solution

  13. Among the following, the species in which the oxidation number of an element is +6

    2000 · with solution

  14. The oxidation number of sulphur in S_8, S_2F_2, H_2S respectively, are

    1999

  15. The number of moles of KMnO_4 that will be needed to react completely with one mole of ferrous oxalate in acidic medium is

    1997

  16. For the redox reaction MnO_4^- + C_2O_4^2- + H^+ → Mn^2+ + CO_2 + H_2O The correct coefficients of the reactants for the balanced reaction are MnO_4^- C_2O_4^2- H^+

    1992

  17. The oxidation number of phosphorus in Ba(H_2PO_2)_2 is

    1988 · with solution

  18. The equivalent weight of MnSO_4 is half of its molecular weight, when it converts to

    1988

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