(a) Describe the importance of pH in everyday life. Illustrate your answer with examples.
(b) A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical meterials which he can mix with the soil to adjust its pH. Give reason for your choice.
(c) Why are detergents also called 'soap-less soaps' ? Give the various advantages of detergents over soaps.
(d) A person put some universal indicator paper on to wet soap. The pH is found to be 8. What does this tell you about soap ?