_________ present in the lemon juice act as electrolyte.

The correct option is D

Citric acid

The correct option is (D): Citric acid

Explanation:

1. When acids are introduced in a solution, they break down into negatively charged anions and positively charged cations, making them electrolytes.
2. Following that, the electrolytic solution conducts electricity.
3. Citric acid is found in lemon juice.
4. Citric acid is an electrolyte because it dissolves in water and transmits electricity. However, the citric acid in lemon juice is a weak electrolyte.

Hence option D is correct