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Question

A solution turns red litmus blue, its pH is likely to be :
  1. 1
  2. 4
  3. 5
  4. 10

A
10
B
4
C
1
D
5
Solution
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The correct option is D 10
Base turns red litmus blue and acid turns blue litmus red. Therefore the pH of solution is in base range which is from 7 to 14. Only option D has pH in this range thus the solution having pH 10 turns red litmus blue.

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