Question

The indicators which turn red in acid solution are ______.

Options

• turmeric and litmus

• phenolphthalein and methyl orange

• litmus and methyl orange

• phenolphthalein and litmus

Answer 1

The indicators which turn red in acid solution are litmus and methyl orange.

Explanation:

Litmus is a natural indicator that transitions from blue to red in the presence of an acid. Methyl orange is a synthetic indicator that changes its colour to red when added to an acidic solution. Conversely, turmeric remains yellow in acid (turning red only in bases), while phenolphthalein becomes completely colourless in acidic conditions.