A sample of hydrazine sulphate (N_2H_6SO_4) was dissolved in 100 mL of water, 10 mL of this solution was reacted w

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Q 1189267117.     A sample of hydrazine sulphate (N_2H_6SO_4) was dissolved in 100 mL of water, 10 mL of this solution was reacted with excess of ferric chloride solution and warmed to complete the reaction. Ferrous ion formed was estimated and it required 20 mL of M/50 potassium permanganate solution. Calculate the amount of hydrazine sulphate in one litre of the solution.
Reaction:
4Fe^(3+) + N_2H_4 → N_2 + 4Fe^(2+) + 4H^+
MnO_4^−+5Fe^(2+) +8H^+ → Mn^(2+) + 5Fe^(3+) + 4H_2O
JEE 1988
A

7.6 g

B

4.2 g

C

6.5 g

D

5.4 g

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