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Structure of the dichromate ion and its terminal oxygen atoms

This type of question, asked 3 times: 2021 Paper 22, 29 Jun 2022, 3 Apr 2025. All 3 questions below, oldest first.

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  1. Question 1

    2021 Paper 22

    34
    In the structure of the dichromate ion, there is a:

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  2. Question 2

    29 Jun 2022

    56
    The number of terminal oxygen atoms present in the product B obtained from the following reaction is
    FeCr2O4+Na2CO3+O2→A+Fe2O3+CO2FeCr_{2}O_{4}+Na_{2}CO_{3}+O_{2}\rightarrow A +Fe_{2}O_{3}+CO_{2}
    A+H+→B+H2O+Na+A +H^{+}\rightarrow B +H_{2}O +Na^{+}

  3. Question 3

    3 Apr 2025

    50
    Consider the following reactions A+NaCl+H2SO4→CrO2Cl2+A + NaCl + H_{2}{SO}_{4} \rightarrow {CrO}_{2}{Cl}_{2} + side products
    CrO2Cl2( Vapour )+NaOH→B+NaCl+H2OB+H+→C+H2O\begin{gathered}{CrO}_{2}{Cl}_{2(\text{~Vapour~})} + NaOH \rightarrow B + NaCl + H_{2}O \\ B + H^{+} \rightarrow C + H_{2}O\end{gathered}
    The number of terminal ' OO ' present in the compound ' CC ' is____ .