Question

Which of the following substances turn blue litmus red?

• A. Carbonated drinks
• B. Soap solution
• C. Pickles
• D. Tea

Answer 1

Answer: (A), (C), (D)

The correct options are
A Carbonated drinks
C Pickles
D Tea

Litmus paper is an indicator which is used to find if a substance is an acid or a base.
Blue litmus turns red in an acidic solution. Whereas, red litmus turns blue in a basic solution.

Among the given options carbonated drinks, pickles and tea are acidic in nature as they contain carbonic acid, acetic acid and tannic acid respectively. Hence, they turn blue litmus red.

Whereas, soap solution contains sodium hydroxide which is a base. Blue litmus does not changes its colour in a basic solution.