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Balance a redox equation and read off the coefficients

This type of question, asked 5 times: 8 Apr 2023, 13 Apr 2023, 29 Jan 2024, 30 Jan 2024, 1 Feb 2024. All 5 questions below, oldest first.

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  1. Question 1

    8 Apr 2023

    31
    2IO3−+xI−+12H+→6I2+6H2O2IO_{3}^{-}+xI^{-}+ 12H^{+}\rightarrow 6I_{2}+ 6H_{2}O What is the value of xx?

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  2. Question 2

    13 Apr 2023

    143
    See the following chemical reaction:
    Cr2O72−+XH++6Fe2+→YCr3++6Fe3++ZH2OCr_{2}O_{7}^{2 -}+XH^{+}+ 6Fe^{2 +}\rightarrow YCr^{3 +}+ 6Fe^{3 +}+ZH_{2}O
    The sum of X,YX, Y and ZZ is____

  3. Question 3

    29 Jan 2024

    49
    Chlorine undergoes disproportionation in alkaline medium as shown below: aCl2( g)+bOH−(aq)→cClO−(aq)+dCl−(aq)aCl_{2}(\text{ }g) + bOH^{-}(aq) \rightarrow cClO^{-}(aq) + dCl^{-}(aq) +eH2O(l)+ eH_{2}O(l) The values of a,b,ca,b,c and dd in a balanced redox reaction are respectively:

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  4. Question 4

    30 Jan 2024

    59
    2MnO4−+bI−+cH2O→xI2+yMnO2+zOH−2MnO_{4}^{-}+bI^{-}+cH_{2}O \rightarrow xI_{2}+yMnO_{2}+zOH^{-} If the above equation is balanced with integer coefficients, the value of zz is ___

  5. Question 5

    1 Feb 2024

    33
    In acidic medium, K2Cr2O7K_{2}Cr_{2}O_{7} shows oxidising action as represented in the half reaction
    Cr2O72−+XH++Ye−→2 A+ZH2OCr_{2}O_{7}^{2 -}+XH^{+}+Ye^{-}\rightarrow 2\text{ }A +ZH_{2}O
    X,Y,ZX,Y,Z and AA are respectively are:

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