Question

Which indicator is correctly paired up with its proper color if it were added to a base?

i. Litmus - blue
ii. Phenolphthalein - pink
iii. Methyl orange - yellow

• A. (i) only
• B. (ii) only
• C. (iii) only
• D. (i) and (iii) only
• E. (i), (ii) and (iii)

Answer 1

The correct option is E (i), (ii) and (iii)

Litmus - It is a type of natural indicator which is made up of lichens. In an acidic solution, its colour turns red. In the basic solution, its colour changes to blue.
Phenolphthalein - It is an acid-base indicator that turns colourless in acidic solution, and turns pink to red in alkaline solution. Here it is a weak base.

Methyl orange - It is a pH indicator. It turns red in acidic solution and yellowish in basic solution.

Hence, the correct option is E.