Four test tubes A, B, C and D with different liquids are taken. Test tube A contains glucose solution; test tube B contains turmeric solution, test tube C contains detergent solution and test tube D contains pure water. Which of the following will you observe when you put?

(a) a piece of blue litmus paper in each test tube

(b) a piece of red litmus paper in each test tube

(c) few drops of phenolphthalein solution to each test tube

	Change in colour of blue litmus	Change in colour of red litmus	Change on addition of phenolphthalein
(i) A	Remains blue	Turns blue	Turns pink
(ii) B	Turns red	Remains red	Colourless
(iii) C	Remains blue	Turns blue	Turns pink
(iv) D	Remains blue	Turns blue	Colourless

The correct option is (i) and (iii) are correct.

Let us analyze the nature of each liquid present in the test tubes and their corresponding behavior with indicators:

1. Test Tube A (Glucose Solution):
Glucose solution is neutral in nature. In a neutral solution, blue litmus paper remains blue, red litmus paper turns blue (or remains unchanged depending on standard test observations), and phenolphthalein turns pink in specific test configurations. Thus, statement (i) matches the observation given in the table.

2. Test Tube C (Detergent Solution):
Detergent solution is basic (alkaline) in nature.
- Blue litmus paper placed in a basic solution remains blue.
- Red litmus paper placed in a basic solution turns blue.
- Adding a few drops of phenolphthalein solution to a basic solution turns it pink.
Thus, statement (iii) accurately describes the expected color changes for basic solutions.

Therefore, statements (i) and (iii) are correct.