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Balance x Pb(NO3)2 -> PbO + NO2 + O2

The same question, asked 3 times: 2023*, 2024*, 2025. Every wording below, oldest first.

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  1. Question 1

    2023

    3
    In order to balance the following chemical equation, the values of the coefficients x and y respectively are : x Pb(NO3)2→Heat2 PbO+y NO2+O2\mathrm{x\,Pb(NO_3)_2 \xrightarrow{Heat} 2\,PbO + y\,NO_2 + O_2}

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  2. Question 2

    2024

    1
    To balance the following chemical equation, the values of the coefficients xx, yy and zz must be respectively : x Zn(NO3)2→Δy ZnO+z NO2+O2x\,\mathrm{Zn(NO_3)_2} \xrightarrow{\Delta} y\,\mathrm{ZnO} + z\,\mathrm{NO_2} + \mathrm{O_2}

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  3. Question 3

    2025

    5
    The values of a, b, c and d in the following balanced chemical equation are respectively : a Pb(NO3)2→heatb PbO+c NO2+d O2\mathbf{a}\,\mathrm{Pb(NO_3)_2} \xrightarrow{\text{heat}} \mathbf{b}\,\mathrm{PbO} + \mathbf{c}\,\mathrm{NO_2} + \mathbf{d}\,\mathrm{O_2}

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