Question

In Kjeldahl's method of estimation of nitrogen, $CuS{O}_4$ act as:

• A. oxidising agent
• B. reducing agent
• C. catalytic agent
• D. hydrolysis agent

Answer 1

Answer: (C)

catalytic agent

Kjeldahl's method is used for the estimation of nitrogen. The organic compound is heated with conc. $H_{2}S{O}_4$ in presence of $K_{2}S{O}_4$ and a little $CuS{O}_4$ to convert all the nitrogen into $(N{H}_4{)}_{2}S{O}_4\cdot K_{2}S{O}_4$ raises the boiling point of $H_{2}S{O}_4$ while $CuS{O}_4$ catalyses the reaction.
Option C is correct.