Question

Choose the odd one out & give a reason:

विकल्प

• Litmus paper

• phenolphthalein

• methyl orange

• Aquaregia.

Answer 1

Aquaregia.

It is a mixture of two acids namely, hydrochloric acid and nitric acid, used to dissolve metals such as gold and platinum whereas the other three are indicators used to identify the nature of the solution.