The ammonia evolved from 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 NaOH solution for complete neutralisation.The organic compound is

Options

A. Urea
B. Benzamide
C. Acetamide
D. Thiourea

Answer

A

Explanation

Equivalent of `NH_(3)` evolved
`=(100xx0.1xx2)/(1000)-(20xx0.5)/(1000)=(1)/(100)`
percent of nitrogen in the unknown organic compound
`=(1)/(100)xx(14)/(0.3)xx100=46.6%`
percent of nitrogen in urea `(NH_(2))_(2)CO`
`=(14xx2)/(60)xx100=46.6%`
`:.` The compound m ust be urea.