A sample of hydrazine sulphate [N_(2)H_(6)SO_(4)] was dissolved in 100 mL water. 10 mL of this solution was treated with excess of FeCl_(3) Sol. Ferrous ions formed were estimated and it required 20 mL of M/50 KMnO_(4) solution in acidic medium. Fe^(+)+N_(2)H_(4)rarrN_(2)+Fe^(2+)+H^(+) MnO_(4^(-)) + Fe^(2+)+H^(+)rarrMN^(2+)+Fe^(3+)+H_(2)O (a) Write the balanced redox reactions. (b) Estimate the amount of hydrazine sulphate in one litre of Sol.

A sample of hydrazine sulphate [N_(2)H_(6)SO_(4)] was dissolved in 100

1.	A sample of hydrazine sulphate [N_(2)H_(6)SO_(4)] was dissolved in 100 mL water. 10 mL of this solution was treated with excess of FeCl_(3) Sol. Ferrous ions formed were estimated and it required 20 mL of M/50 KMnO_(4) solution in acidic medium. Fe^(+)+N_(2)H_(4)rarrN_(2)+Fe^(2+)+H^(+) MnO_(4^(-)) + Fe^(2+)+H^(+)rarrMN^(2+)+Fe^(3+)+H_(2)O (a) Write the balanced redox reactions. (b) Estimate the amount of hydrazine sulphate in one litre of Sol.
Answer» Solution :(a) Given `4Fe^(3+)+N_(2)H_(4)rarrN_(2)+4Fe^(2+)+4H^(+)` `MnO_(4^(-))+5Fe^(2+)+8H^(+)rarr Mn^(2+)+5Fe^(3+)+4H_(2)O` (b) In 10 mL solution , EQ. of `N_(2)H_(6)SO_(4)`=Eq. of `Fe^(2+)` = Eq. of `KMnO_(4)` `=20xx(1)/(50)xx5xx10^(-3)=2xx10^(-3)` v.f. of `N_(2)H_(6)SO_(4)=4` so, WEIGHT of `N_(2)H_(6)SO_(4)` in 1 L solution `=(2xx10^(-3)xx1000)/(4xx10)xx130=6.5 g.`