(a) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions?
(b) The pH values of three acids A, B and C having equal molar concentrations are 5.0, 2.8 and 3.5 respectively. Arrange these acids in order of the increasing acid strengths.

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Solution

a) A cold drink with a pH value of 5 is acidic. Therefore, blue litmus turns red and red litmus remains as it is.

b) Acids have a pH value of less than 7. Lower the pH value, the stronger the acid. Hence, the acids in the increasing order of their strengths are as follows: A < C < B.

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