CBSE Important Questions

Acids, Bases and Salts

1. Aqueous solution of sodium carbonate is alkaline in nature. Explain why?
2. Why should curd and sour substances not to be kept in brass and copper vessels?
3. Which gas is usually liberated when an acid reacts with a metal?
4. Why does dry HCL gas does not change the colour of dry litmus paper?
5. Tap water conducts electricity whereas distilled water does not. Why?
6. What are acids?
7. Give features of acids?
8. What are indicators?
9. What are universal indicators?
10. What are bases?
11. Explain reaction of a Non-metallic oxide with base?
12. What is Plaster of Paris?
13. Enlist uses of Plaster of Paris?
14. Give uses of Washing soda?
15. How to prepare Washing soda?
16. How to prepare Bleaching powder?
17. Give uses of Bleaching powder?
18. What is the effect of heat on baking soda?
19. What is baking soda? How it is known chemically?
20. Give the chemical name of washing soda?
21. Give two examples of hydrated salt which are white and state their chemical formula?