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
`= (100 xx 0.1 xx 2)/(1000) - (20 xx 0.5)/1000 = 1/100`
percent of nitrogen in the unknown organic compound
` = 1/100 xx 14/0.3 xx 100 = 46.6%`
percent of nitrogen in urea `(NH_2)_2CO`
` = (14 xx2)/(60) xx 100 = 46.6%`
`:.` The compound must be urea.