Question

You are provided with three test tubes A, B and C as shown in Figure 5.3 with different liquids. What will you observe when you put

1. a piece of blue litmus paper in each test tube.
2. a piece of red litmus paper in each test tube.
3. a few drops of phenolphthalein solution to each test tube.

Answer 1

Test tube	Effect on blue litmus paper	Effect on red litmus paper	Effect on phenol­ – phthalein solution
A	turns red	no change	colourless
B	no change	turns blue	turns pink
C	no change	no change	colourless