Question

1. Name two constituents of baking power.
2. What is universal indicator?
3. Name the chemicals that can be made of common salt.
4. Why does cake become fluffy after adding baking soda?
5. Write the pH value, after which teeth start decaying?
6. State some uses of baking soda?
17. How is the concentration of hydroxide ions (OH) affected when excess base is dissolved in a
solution of sodium hydroxide?
8. Name the gas evolved when dilute sulphuric acid acts on sodium carbonate. Write the chemical
equation for the reaction involved.
9. What are the properties and uses of bleaching powder?
10. Write a chemical formula to represent the action of atmospheric CO2 gas on bleaching powder
when left exposed in open.
11. What happens when quick lime is added to water?
12. Write any two properties of acids.
13. How will you test for a gas which is liberated when HCl reacts with an active metal?
14. What is baking powder? How does it make the cake soft and spongy?
15. When fresh milk is changed into curd will its pH value increase or decrease? Why?
16. Give a few uses of acids, bases and salts respectively.
17. What happens chemically when quick lime is added to water?
18. Name the gas evolved when dilute HCl reacts with Sodium hydrogen carbonate. How is it
recognized?
19. How does the flow of acid rain water into a river make the survival of aquatic life in the river
difficult?
20. How is the pH of a solution of an acid influenced when it is diluted?




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Answer 1

Answer:

1.

Explanation:

1.Sodium and Bicarbonate

2. Universal indicator is solution which indicates the ph value of an acid or base.

3. Sodium and Chloride ion

4. I dont know.

5.

6.

7. it Depends on the Ph value of the base

8. Carbon dioxide gas. H2SO4 + CaCO3 gives rise to CaSO4 + H2O + CO2

Answer 2

2. A universal indicator is used to test several bases and acids. It can be used on any solution. That’s why it is called “universal “ indicator.
Hope it helps...