Question

Which of the following is best scientific method to test presence of water in a liquid?

• A. Taste
• B. Smell
• C. Use of litmus paper
• D. Use of anhydrous copper sulfate

Answer 1

The correct option is D Use of anhydrous copper sulfate

Anhydrous copper sulfate $\left(CuS{O}_4\right)$ is used to test whether the solution contains water or not. If water is present the solution becomes blue when you add $CuS{O}_4$ to it.
Hence option D is correct.