A student measured the pH values of four solutions P, Q, R and S as 10, 6, 0 and 12 respectively. The solution which is the most acidic is likely to be the solution :(1) P (2) Q (3) R (4) S

Correct answer: (3) R

Explanation : pH scale ranges from 0-14, acids lie between 0 to 7, pH = 7 is neutral and bases lie between pH 7.1 to 14. Lower the value of pH stronger will be the acid, hence the solution having pH = 0 (R) is the strongest acid.

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