The soil in a field is highly acidic. Name two materials which can be added to this soil to reduce its acidity. Give the reason for your choice.

Name two materials which can be added to a highly acidic soil to reduce its acidity . Give reasons for your answer.

Name two waste materials which can be recycled.

(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 ?

Name two metals which can displace hydrogen from acids.

Butter is an example of one type of colloidal solution. Name it. Give a reason for your choice.

Name two measures which prevent the soil erosion.

Name the substance which should be added to acetic acid to test its acidic character.

Which of the following is not observed in a homologous series? Give reason for your choice.