Question

2
Conducts experiments to test the nature of substances by using red and blue litmus
papers​

Answer 1

Explanation:

While conducting the litmus paper test to determine the acidity or basicity of a substance 2 types of litmus paper are considered i.e Blue litums and Red litmus.

Answer 2

from the question

2 determine that the solution is acid or a base and the blue litmus turns to red and no effect on red litmus