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Acidified K2Cr2O7 as an oxidising agent: what it oxidises and the Cr product

This type of question, asked 6 times: 24 Jan 2023, 25 Jan 2023, 28 Jan 2025, 23 Jan 2026 S2, 24 Jan 2026 S1, 2 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    24 Jan 2023

    124
    K2Cr2O7K_{2}Cr_{2}O_{7} paper acidified with dilute H2SO4H_{2}SO_{4} turns green when exposed to

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  2. Question 2

    25 Jan 2023

    125
    Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from

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  3. Question 3

    28 Jan 2025

    44
    Which of the following oxidation reactions are carried out by both K2Cr2O7K_{2}Cr_{2}O_{7} and KMnO4KMnO_{4} in acidic medium? (A) I−→I2I^{-}\rightarrow I_{2} (B) S2−→SS^{2 -}\rightarrow S (C) Fe2+→Fe3+Fe^{2 +}\rightarrow Fe^{3 +} (D) I−→IO3−I^{-}\rightarrow IO_{3}^{-} (E) S2O3 2−→SO4 2−S_{2}O_{3}\ ^{2 -}\rightarrow SO_{4}\ ^{2 -} Choose the correct answer from the options given below :

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  4. Question 4

    23 Jan 2026 S2

    42
    The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7K_{2}Cr_{2}O_{7} solution is:

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  5. Question 5

    24 Jan 2026 S1

    50
    X and Y are the number of electrons involved, respectively during the oxidation of I−I^{-}to I2I_{2} and S2−S^{2 -} to S by acidified K2Cr2O7K_{2}{Cr}_{2}O_{7}. The value of X+YX + Y is____\_\_\_\_ .

  6. Question 6

    2 Apr 2026 S1

    36
    Which of the following sets includes all the species that will change the orange colour of K2Cr2O7K_{2}Cr_{2}O_{7} in acidic medium?

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