Page 49 - Science Class 07

3. Write the process of the prepara on of carbonic acid.
4. Write any four proper es of acids.

5. How bases are formed?
6. Write the uses of hydrochloric and nitric acid.
7. How can you find out whether a given substance is acidic or basic?

8. Write the tests for bases.
9. Write the uses of bases.
10. How can you find that the given substance is neutral or not?
F. Long answer ques ons.

1. Give two main uses each of:
a. sulphuric acid
b. hydrochloric acid

c. nitric Acid
2. What do you mean by a neutraliza on reac on? How can a neutraliza on reac on be used
to prepare common salt?
3. Some acids are dangerous, other are not. Explain, giving examples.
4. What are bases? What are their physical proper es?
5. Give two main uses each of:

a. calcium hydroxide
b. ammonium hydroxide
c. sodium hydroxide

6. State two methods by which salts can be prepared. Give one example of each.
7. How are salts named? Give two examples.

Project
Project ActivityActivityActivity
Project
Project Activity
A. Make a list of fruits which have sour taste. Taste these fruits one-by-one and write the
difference in their tastes.
B. Take a small cup of milk and boil it, when it starts boiling put a small piece of alum in it. In a
few minutes you will observe that the milk spoils. Cool the milk and separate the residue and
liquid. The liquid you get is lac c acid.

HOTSTSTS
HO
HO
HOTS
A. Is the meaning of ‘weak acid’ the same as that of ‘dilute acid’?
B. The wastes of many factories contain acids. Why is it considered necessary to neutralize them
before allowing the wastes to flow into water bodies?

Science-7 49