In Kjeldahl's method for estimation of nitrogen, $$CuSO_4$$ acts as :

In Kjeldahl's method, we need to identify the role of $$CuSO_4$$.

Kjeldahl's method overview:

This method estimates nitrogen content in organic compounds through three steps: digestion, distillation, and titration.

Role of $$CuSO_4$$ in the digestion step:

During digestion, the organic compound is heated with concentrated $$H_2SO_4$$. The nitrogen in the organic compound is converted to ammonium sulfate $$(NH_4)_2SO_4$$. $$CuSO_4$$ acts as a catalyst in this process:

- The $$Cu^{2+}$$ ions accelerate the oxidative breakdown of the organic compound.

- They help achieve faster and more complete conversion of organic nitrogen to $$NH_4^+$$.

- Without the catalyst, the digestion would be much slower and may be incomplete.

$$K_2SO_4$$ is also added to raise the boiling point of the acid mixture, but $$CuSO_4$$ specifically serves as a catalytic agent.

The correct answer is Option B: Catalytic agent.