Question

A solution turns red litmus blue, its pH is likely to be (a) 1 (b) 4 (c) 5 (d) 10

Answer 1

The correct answer is (d) 10

Red litmus becomes blue when it comes in contact with bases. Blue litmus becomes red when it comes in contact with acids. The pH value of a base solution is more than 7. Since red litmus becomes blue when it comes in contact with the mentioned solution, its pH value may be 10.

Answer 2

(d) Bases turn red litmus blue and acids turn blue litmus red. Basic solution has a pH value more than 7. Since the solution turns red litmus blue, its pH is likely to be 10.

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