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Redox titration with KMnO4 or K2Cr2O7: molarity, strength or volume

This type of question, asked 8 times: 2021 Paper 14, 2021 Paper 17, 2021 Paper 20, 28 Jun 2022, 27 Jul 2022, 4 Apr 2024, 23 Jan 2026 S2, 4 Apr 2026 S1. All 8 questions below, oldest first.

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  1. Question 1

    2021 Paper 14

    42
    Fe2+Fe^{2 +} reacts with K2Cr2O7K_{2}Cr_{2}O_{7} in acidic medium. Volume of Fe2+=10mlFe^{2 +}= 10ml, Volume of K2Cr2O7=15mlK_{2}Cr_{2}O_{7}= 15ml. molarity of K2Cr2O7=0.1MK_{2}Cr_{2}O_{7}= 0.1M Find the molarity of Fe2+Fe^{2 +}

  2. Question 2

    2021 Paper 17

    54
     10.0 mL\ 10.0\text{ }mL of 0.05MKMnO40.05MKMnO_{4} solution was consumed in a titration with 10.0 mL10.0\text{ }mL of given oxalic acid dihydrate solution. The strength of given oxalic acid solution is ×10−2 g/L\times10^{- 2}\text{ }g/L. (Round off to the nearest integer)

  3. Question 3

    2021 Paper 20

    60
    When 10 mL10\text{ }mL of an aqueous solution of KMnO4KMnO_{4} was titrated in acidic medium, equal volume of 0.1 MM of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4KMnO_{4} in grams per litre is ×10−2\times10^{- 2}. (Nearest integer) [Atomic mass of K=39,Mn=55,O=16K = 39,Mn = 55,O = 16 ]

  4. Question 4

    28 Jun 2022

    150
    0.01MKMnO40.01MKMnO_{4} solution was added to 20.0 mL20.0\text{ }mL of 0.05M0.05M Mohr's salt solution through a burette. The initial reading of 50 mL50\text{ }mL burette is zero. The volume of KMnO4KMnO_{4} solution left in the burette after the end point is mLmL. (nearest integer)

  5. Question 5

    27 Jul 2022

    51
    20 mL20\text{ }mL of 0.02MK2Cr2O70.02MK_{2}Cr_{2}O_{7} solution is used for the titration of 10 mL10\text{ }mL of Fe2+Fe^{2 +} solution in the acidic medium. The molarity of Fe2+Fe^{2 +} solution is ×10−2M\times10^{- 2}M (Nearest Integer)

  6. Question 6

    4 Apr 2024

    55
    Only 2 mL2\text{ }mL of KMnO4KMnO_{4} solution of unknown molarity is required to reach the end point of a titration of 20 mL20\text{ }mL of oxalic acid (2 M) in acidic medium. The molarity of KMnO4KMnO_{4} solution should be ____ M.

  7. Question 7

    23 Jan 2026 S2

    48
    200 cc of x×10−3Mx \times 10^{- 3}M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium. Here x=x =

  8. Question 8

    4 Apr 2026 S1

    31
    In order to oxidise a mixture of 1 mole each of FeC2O4,Fe2(C2O4)3,FeSO4FeC_{2}O_{4},Fe_{2}\left( C_{2}O_{4} \right)_{3},FeSO_{4} and Fe2(SO4)3Fe_{2}\left( SO_{4} \right)_{3} in acidic medium, the number of moles of KMnO4KMnO_{4} required is :

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