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Question

A solution turns red litmus into blue; its pH is likely to be


A

1

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B

4

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C

5

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D

10

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Solution

The correct option is D

10


Explanation for the correct answer:-

Option (D) 10

  • The change of colour of red litmus paper to blue generally happens when it is dipped in an alkaline solution (Base).
  • This indicates that the solution in which it is dipped is a basic solution, and has a pH of more than 7.
  • In the pH scale the number 7 represents that the solution is neutral.
  • If the value is more than 7 then it is an alkaline solution if it is less than 7 then it is an acidic solution.
  • Here the colour is changing to blue, it indicates that the pH of the solution is more than 7 and hence is a basic solution.
  • Thus the pH of the solution might be 10.
  • Hence it is the correct option.

Explanation for the incorrect answer:-

Option (A) 1

  • pH 1 means that the solution is highly acidic.
  • But here the litmus paper turns blue which means that the solution is alkaline or the pH is more than 7.
  • Thus the pH of the solution has to be more than 7 not 1.
  • Hence it is the incorrect option.

Option (B) 4

  • pH 4 means that the solution is acidic.
  • But here the litmus paper turns blue which means that the solution is alkaline or the pH is more than 7.
  • Thus the pH of the solution has to be more than 7 not 4.
  • Hence it is the incorrect option.

Option (C) 5

  • pH 5 means that the solution is highly acidic.
  • But here the litmus paper turns blue which means that the solution is alkaline or the pH is more than 7.
  • Thus the pH of the solution has to be more than 7 not 5.
  • Hence it is the incorrect option.

Therefore, option (D) 10 is the correct answer.


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