6(c)
Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively.
Which one of these is a:
(i) Weak acid?
(ii) Strong alkali?
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(i) Q
Reason — On a pH scale, acids have pH less than 7 whereas weak acids have pH towards 7. Hence, Q will be a weak acid with pH 5.2 .
(ii) R
Reason — On a pH scale, alkali have pH more than 7 and alkalinity increases as the pH value moves away from 7. Hence, R will be a strong alkali with pH 12.2 .