Which of the following is a disproportion reaction?A. `CH_(4) + 2O_(2) to CO_(2) + 2H_(2)O`B. `CH_(4) + 4Cl_(2) to C Cl_(4) +4HCl`C. `2F_(2) + 2OH^(-) to 2F^(-) + OF_(2) + H_(2)O`D. `2NO_(2) + 2OH^(-) to NO_(2)^(-) + NO_(3)^(-) + H_(2)O`

Which of the following is a disproportion reaction?A. `CH_(4) + 2O_(2)

1.	Which of the following is a disproportion reaction?A. `CH_(4) + 2O_(2) to CO_(2) + 2H_(2)O`B. `CH_(4) + 4Cl_(2) to C Cl_(4) +4HCl`C. `2F_(2) + 2OH^(-) to 2F^(-) + OF_(2) + H_(2)O`D. `2NO_(2) + 2OH^(-) to NO_(2)^(-) + NO_(3)^(-) + H_(2)O`
Answer» Correct Answer - D Reactions in which the same substance is oxidised as well as reduced are called disproportionation reactions. Writing the oxidation number of each element above its symbol in the given reactions. (a) `overset(-4)(C)overset(+1)(H_(4)) + 2overset(0)O_(2) to overset(+4)(C)overset(-2)(O_(2)) + 2overset(+1)H_(2)overset(-2)O` (b) `overset(-4)(C)overset(+1)(H_(4)) + 4overset(0)Cl_(2) to overset(+4)Coverset(+1)(Cl_(4)) + 4overset(+1)Hoverset(-1)(Cl)` (c ) `2overset(0)F_(2) + 2overset(-2)Ooverset(+1)H to 2overset(-1)F + overset(+2)Ooverset(-1)F_(2) + overset(+1)H_(2)overset(-2)(O)` (d) `2overset(+4)N overset(-2)(O_(2)) + 2overset(-2)Ooverset(+1)H to overset(+2)Ooverset(-1)F_(2) + overset(+1)(H_(2))overset(-2)O` (d) `2overset(+4)Noverset(-2)O_(2) + 2overset(-2)Ooverset(+1)H to overset(+3)Noverset(-2)(O_(2)^(-)) + overset(+1)H_(2)overset(-2)O` Thus, in reaction (d), N is both oxidised as well as reduced since, the oxidation number increases from +4 in `NO_(2)` to `+5` in `NO_(3)^(-)` and decreases from `+4` in `NO_(2)` to `+3` in `NO_(2)^(-)`

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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 is a disproportion reaction?A. `CH_(4) + 2O_(2) to CO_(2) + 2H_(2)O`B. `CH_(4) + 4Cl_(2) to C Cl_(4) +4HCl`C. `2F_(2) + 2OH^(-) to 2F^(-) + OF_(2) + H_(2)O`D. `2NO_(2) + 2OH^(-) to NO_(2)^(-) + NO_(3)^(-) + H_(2)O`

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