Which one of the following procedures is correct to detect the acidic nature of `SO_(2)` gas?

Options

A. Insert wet blue litmus paper in a gas jar filled with `SO_(2)` gas
B. Insert wet red litmus paper in a gas jar filled with `SO_(2)` gas
C. Insert dry blue litmus paper in a gas jar filled with `SO_(2)` gas
D. Insert dry red litmus paper in the gas jar filled with `SO_(2)` gas

Answer

B

Explanation

NA