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Ionisable and Non-Ionisable Compounds

A student mea...

Question

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

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Solution

pH scale ranges from 0-14, acids have 0-6.9 range, bases have 7.1-14 and pH = 7 is neutral. Lower the value of pH stronger will be the acid, so solution having pH = 0 is the strongest acid, so R is the strongest acid.

Hence, the correct answer is option 3.

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