Question

Pick out the correct statement(s) above a universal indicator.

• A. It is a mixture of some indicators.
• B. It shows the change in colour at different pH with altogether different colours for a change in pH by 1 units.
• C. Phenolphthalein is an universal indicator.
• D. a mixture of methyl red, $\alpha$-naphthol, phthalein blue shows different colours between pH range 4 to 11
  .
  

Answer 1

Answer: (A), (B), (D)

The correct options are
A It is a mixture of some indicators.
B It shows the change in colour at different pH with altogether different colours for a change in pH by 1 units.
D a mixture of methyl red, $\alpha$-naphthol, phthalein blue shows different colours between pH range 4 to 11

.
A universal indicator contains a solution of several compounds and exhibits several color changes over a pH range of 1 to 14.
A mixture of methyl red, alpha -naphthol-phthalein, bromothymol blue and phenolphthalein acts as a universal indicator and shows different colors between pH range 4 to 11.