Q. Methyl orange is

A
Red in acidic medium, colourless in basic medium
B
Red in acidic medium, yellow in basic medium
C
Colourless in acidic medium, red in basic medium
D
Yellow in acidic medium, red in basic medium
Solution:

Methyl orange shows red color in acidic medium and yellow color in basic medium. Because it changes color at the pH of a mid strength acid, it is usually used in titration for acids. The pH range is 3.0-4.4 and methyl orange indicator is used for the titration of strong acid against strong or weak base.

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