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ICSE Class 10 Chemistry Question 16 of 20

Solved 2018 Question Paper ICSE Class 10 Chemistry — Question 16

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16
Question

Question 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?

Answer

(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 .