The ammonia evolved by the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 ml of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M solution hydroxide solution for complete neutralization. The organic compound is

Options

A. acetamide
B. benzamide
C. urea
D. thourea

Answer

C

Explanation

Excess of acid `=20xx0.5xx1` m.e.q.
Acid taken initially `= 100xx0.1xx2` m.e.q.
Acid used for neutralisation
`(100xx0.1xx2)-(20xx0.5xx1)`
`20-10=10` m.eq.
`rArr NH_(3)` liberated = 10 m.eq.
`% N = (NH_(3)" liberated (m.eq)")/("wt.of org. compound")xx1.4`
`=(10xx1.4)/(0.3)=46.66% rArr` Urea has 46.66% N.