A) When two drops of phenolphthalein solution are added to the test tube,
A. The solution turns pink in colour
B. The solution turns colourless
C. The solution turns red
D. The solution turns yellow
Answer:A
A) When two drops of phenolphthalein solution are added to the test tube,
A. The solution turns pink in colour B. The solution turns colourless C. The solution turns red D. The solution turns yellow
Explanation: Phenolphthalein is a colourless reagent which is used as an indicator as it changes the colour to pink in a basic solution. As dilute NaOH is a basic solution, its colour changes to pink on adding a few drops of phenolphthalein solution.