Question

Which of the following indicator have different pH range is --
a. phenolphthalein indicator
b. acid-base indicator
c. methyl orange indicator
d. universal indicator​

Answer 1

Answer:

D . universal indicator

Answer 2

The indicator which has different pH range is (b) acid base indicator.

- The pH range of phenolphthalein indicator is 8.2 - 10

- The pH range of acid base indicator is different for different indicators. There are different acid base indicators which work in different pH ranges.

- The pH range of methyl orange indicator is fixed, i.e., 3.1 - 4.4

- The universal indicator can work in all the pH ranges.

- Hence the correct answer is option (b)