In balancing the half reaction `CN^(ө)rarrCNO^(ө)`(skeltan) The number of electrons that must be added is

In balancing the half reaction `CN^(ө)rarrCNO^(ө)`(skeltan) The numb

1.	In balancing the half reaction `CN^(ө)rarrCNO^(ө)`(skeltan) The number of electrons that must be added is
Answer» Correct Answer - D `CN^(-) to CNO^(-)` Oxidation number of nitrogen in `CN^(-)` `4+x = -1` and in `CNO^(-) 4 + x-2 =-1` `x=-5 , x=-3` `CN^(-)` is thus oxidised by losing two electrons.

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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
`12. g` of an impure sample of arsenious oxide was dissolved in water containing `7.5 g` of sodium bicarbonate and the resulting solution was diluted to `250 mL`. `25 mL` of this solution was completely oxidised by `22.4 mL` of a solution of iodine. `25 mL` of this iodine solution reacted with same volume of a solution containing `24.8 g` of sodium thiosulphate `(Na_(2)S_(2)O_(3).5H_(2)O)` in one litre. Calculate teh percentage of arsenious oxide in the sample ( Atomic mass of `As=57`)
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In balancing the half reaction `CN^(ө)rarrCNO^(ө)`(skeltan) The number of electrons that must be added is

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