1.

A sample of hyrdazine sulphate (N_(2)H_(6)SO_(4)) was dissovled in 100ml 10ml of this solution was reacted with excess of FeCl_(3) solution and warmed to complete the reaction Ferrous ions formed required 20ml of (M)/(50) KMnO_(4) solution Given: 4Fe^(+3)+N_(2)H_(4)rarrN_(2)+4Fe^(+2)+4H^(+) MnO_(4)^(-)+5Fe^(+2)+8H^(+)rarrMn^(2+)+5Fe^(+3)+4H_(2)O The amount in gm of hydrazinc sulphate in one litre is:

Answer»

1.30gm
6.5gm
3.25gm
8.66gm

Solution :`N_(kmNo_(4))=(20)/(1000)xx(1)/(50)`
`n_(Fe^(+2))xxn_(KMnO_(4))`
`=5xx(20)/(1000)xx(1)/(50)=0.002`
`n_(N)_(2)H_(4))` is 10 ml `=(1)/(4) n_(Fe^(+2))=(0.002)/(4)`
`n_(N_(2)H_(4))` is 1L`=(0.002)/(4)xx100=(0.2)/(4)`
mass of `N_(2)H_(6)SO_(4)` in `1L=(0.2)/(4)xx130=6.5gm`


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