Question

Multiple chole cuestions
Tick () the correct options,
Objective Type Questions
1. Which of the following is a physical but ireversible change?
a. Burning of a matchstick
b. Melting of an ice cream
c. Lighting of an electric bulb
d. Crushing of a glass bottle
2. Physical changes are
a. always reversible
b. mostly reversible
c. always irreversible
d. mostly irreversible
3. Physical changes do not include
a, formation of new substance
b. change in shape
C. change in state
d. change in colour
4. During a chemical change
a, a new substance is formed
b. irreversible reactions take place
c. colour of the substance may change
d. all of these
5. Which of the following is a chemical change?
a, Boiling of water
b. Burning of the wick of a candle
c. Melting of the wax of a candle
d. All of these
6. When oxygen and air react with iron, it forms
b, acid
a rust
d. none of these
6. salt
7. Which gas is evolved when vinegar reacts with baking soda?
a. Oxygen
b. Nitrogen
c. Hydrogen
d. Carbon dioxide
8. Carbon dioxide turns limewater
b. red
a blue
c. milky
d. green
9. Rusting of iron can be prevented by
a, alloying
b. painting
c. galvanisation
d. all of these
10. Sea water is collected in open shallow ponds to obtain
a. washing soda
c. baking soda
d. common salt
hed
b. sugar​

Answer 1

Answer:

1 ja melting of ice Cream

Answer 2

Answer:

1. d. Crushing of a glass bottle

2. b. mostly reversible

3.