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Chromate and dichromate interconversion with pH

This type of question, asked 4 times: 2021 Paper 25, 14 Jun 2022, 8 Apr 2024, 23 Jan 2025. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 25

    60
    Dichromate ion is treated with base, the oxidation number of CrCr in the product formed is:

  2. Question 2

    14 Jun 2022

    56
    The difference in oxidation state of chromium in chromate and dichromate salts is

  3. Question 3

    8 Apr 2024

    131
    The equilibrium Cr2O72−⇌2CrO42−Cr_{2}O_{7}^{2 -}\rightleftharpoons 2CrO_{4}^{2 -} is shifted to the right in:

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  4. Question 4

    23 Jan 2025

    120
    Consider the following reactions
    K2Cr2O7→KOH−H2O[ A]→H2SO4−H2O[ B]+K2SO4K_{2}Cr_{2}O_{7}\underset{-H_{2}O}{\overset{KOH}{\rightarrow}}\lbrack\text{ }A\rbrack\underset{-H_{2}O}{\overset{H_{2}SO_{4}}{\rightarrow}}\lbrack\text{ }B\rbrack +K_{2}SO_{4}
    The products [A]\lbrack A\rbrack and [B]\lbrack B\rbrack, respectively are :

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