acids , bases and salts

ACID, BASES AND SALTS

1. Explain the pH change as the tooth decay. How can tooth decay caused by pH change be prevented?
2. What happens during a bee sting? What is its remedy?
3. The pH of a soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powered chalk to adjust its to adjust its pH and why?
4. A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
5. Explain why, an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.
6. What is a salt? Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.
7. What is meant by a family of salts? Explain with examples.
8. Write the chemical name and formula of common salt.
9. Name the major salt present in sea-water?
10. Name three chemicals made from common salt.
11. Give any two uses of common salt.
12. Name the salt which is used as a preservative in pickle, and in curing meat and fish.
13. What happens when a concentrated solution of sodium chloride is electrolyzed? Write the equation of the reaction involved.
14. The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.
15. Explain why, chlorine is used for sterilizing drinking water supply.
16. Name the product formed when Cl₂ and H₂ produced during the electrolysis of brine are made to combine.
17. Write the chemical formula of sodium carbonate.
18. Name a metal compound which has detergent properties.
19. Name a sodium compound used for softening hard water.
20. What is the common name Na₂CO₃.10H₂O?

ACID BASES AND SALTS

1. Explain the pH change as the tooth decay. How can tooth decay caused by pH change be prevented?
2. What happens during a bee sting? What is its remedy?
3. The pH of a soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powered chalk to adjust its to adjust its pH and why?
4. A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
5. Explain why, an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.
6. What is a salt? Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.
7. What is meant by a family of salts? Explain with examples.
8. Write the chemical name and formula of common salt.
9. Name the major salt present in sea-water?
10. Name three chemicals made from common salt.
11. Give any two uses of common salt.
12. Name the salt which is used as a preservative in pickle, and in curing meat and fish.
13. What happens when a concentrated solution of sodium chloride is electrolyzed? Write the equation of the reaction involved.
14. The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.
15. Explain why, chlorine is used for sterilizing drinking water supply.
16. Name the product formed when Cl₂ and H₂ produced during the electrolysis of brine are made to combine.
17. Write the chemical formula of sodium carbonate.
18. Name a metal compound which has detergent properties.
19. Name a sodium compound used for softening hard water.
20. What is the common name Na₂CO₃.10H₂O?