Question

A few drops of aqueous NaOH are dropped on a pH paper. The color of the pH paper will turn to:

• A. blue
• B. green
• C. yellow
• D. violet

Answer 1

The correct option is D

violet

Explanation for the correct option:

(D) Violet

1. Litmus paper turns red for an acidic solution and turns blue or violet for basic, neutral, alkaline solutions.
2. NaOH is a strong base with pH 13 so when a few drops are dropped on pH paper it turns violet.

Explanation for incorrect options(s):

(A) blue

The blue color indicates the solution is slightly basic in nature.

(B) green

The green color on pH paper indicates a neutral or slightly acidic solution.

(C) yellow

The yellow color indicates the solution is acidic in nature.

Hence, the correct answer is an option (D).