Question

8.
9.
10.
(a) the volume of gas expands on heating
b) two gases cannot diffuse into each other
(c) gas is converted into solid, it is called condensation
(d) gases cannot diffuse in solids
As the pressure of air decreases, the boiling point of the liquid
(a) decreases (b) increases (c) does not changes (d) none of these
Which among the following can exist in vapour state?
(a) oxygen
(b) hydrogen (c) carbon dioxide
Vd) water
At normal pressure (1 atmospheric pressure) the boiling point of water is
(a) 98°C
(b) 100°C
(c) 110°C
(d) 90°C
The pressure of air is measured in atmosphere and pascal. 1 atmospheric pressure is equal to
(a) 1.01325 x 109 Pa (b) 1.01325 x 104 Pa (c) 10.1325 x 10% Pa (d) 10.1325 x 106 Pa
Cooking of rice at higher altitudes is difficult because
(a) water boils at 100°C
(b) water boils at < 1000C
(c) boiling point of water is constant (d) none of the above
11.
12.
13.
VERY SHORT ANSWER TYPE QUESTIONS
At at

Answer 1

Answer:

1. As the pressure of air decreases, the boiling point of the liquid increases.

2. Which among the following can exist in vapour state?

Answer is water. Water exist in a vapour state. Boiling of water causes rise of vapour it means that water can exist in vapour on heating.

3. At normal pressure (1 atmospheric pressure) the boiling point of water is 100° C

4. The pressure of air is measured in atmosphere and pascal. 1 atmospheric pressure is equal to 10.1325 x 106 Pa.

4. Cooking of rice at higher altitudes is difficult because water boils at 100°C.

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