Question

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

Answer 1

Here mate..
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The answer is 10(D) cause the solution turns red litmus blue if it comes to contact with base.. and pH10 is a base..
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Answer 2

We have been given a question and we have been given options and we have to choose the correct option from the given options.

The question given to us is that a solution turns red litmus blue, what is the pH of the solution.

The answer to the question is  D) 10.