which of the following represent redox reactions? I. `Cr_(2)O_(7)^(2-)+2overset(ө)OHrarr2CrO_(4)^(2-)+H_(2)O` II. `Zn+CuSO_(4)rarrZnSO_(4)+Cu` III. `MnO_(4)^(ө)+3Mn^(2+)+4overset(ө)OHrarr5MnO_(2)+2H_(2)O` IV. `2Cu^(o+)rarrCu+Cu^(2+)`A. `I,II`B. `I,III`C. `III,IV`D. `II,III,IV`

which of the following represent redox reactions? I. `Cr_(2)O_(7)^(2-)

1.	which of the following represent redox reactions? I. `Cr_(2)O_(7)^(2-)+2overset(ө)OHrarr2CrO_(4)^(2-)+H_(2)O` II. `Zn+CuSO_(4)rarrZnSO_(4)+Cu` III. `MnO_(4)^(ө)+3Mn^(2+)+4overset(ө)OHrarr5MnO_(2)+2H_(2)O` IV. `2Cu^(o+)rarrCu+Cu^(2+)`A. `I,II`B. `I,III`C. `III,IV`D. `II,III,IV`
Answer» Correct Answer - D `II, III and IV` are redox reactions.

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`0.80 g` of sample of impure potassium dichromate was dissolved in water and made up to `500 mL` solution. `25 mL` of this solution treated with excess of `KI` in acidic medium and `I_(2)` liberated required `24 mL` of a sodium thiosulphate solution. `30 mL` of this sodium thiosulphate solution required `15 mL` of `N//20` solution of pure potassium dichromate. What was the percentage of `K_(2)Cr_(2)O_(7)` in given sample?A. `73.5%`B. `75.3%`C. `36.75%`D. none of these
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which of the following represent redox reactions? I. `Cr_(2)O_(7)^(2-)+2overset(ө)OHrarr2CrO_(4)^(2-)+H_(2)O` II. `Zn+CuSO_(4)rarrZnSO_(4)+Cu` III. `MnO_(4)^(ө)+3Mn^(2+)+4overset(ө)OHrarr5MnO_(2)+2H_(2)O` IV. `2Cu^(o+)rarrCu+Cu^(2+)`A. `I,II`B. `I,III`C. `III,IV`D. `II,III,IV`

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