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Question

A solution has turned the colour of the red litmus paper to blue. The pH of the solution is approximately :


A

2

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B

5

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C

7

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D

10

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Solution

The correct option is D

10


Litmus paper

  1. Litmus paper is an acid-base indicator.
  2. In the presence of an acid, blue litmus paper turns red.
  3. In the presence of a base, red litmus paper turns blue.

pH scale

  1. pH scale is used to signify the strength of an acid or a base.
  2. pH of 7 indicates a neutral substance.
  3. pH greater than 7 indicates basic behavior.
  4. pH less than 7 indicates acidic behavior.

Explanation for the correct option

Option D

  1. pH value of 10 indicates basic behavior.
  2. Basic substances turn the color of red litmus paper to blue.

Explanation of incorrect options

Option A

pH 2 indicates acidic behavior which will not turn red litmus paper blue.

Option B

pH 5 indicates acidic behavior which will not change red litmus paper blue.

Option C

pH 7 indicates neutral behavior which will not change red litmus paper blue.

Therefore option D is the correct option.


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