Punjab 9th Class Chemistry Chapter 5 Physical States of Matter Punjab 9th Class

5
• Chemistry
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Question 1 of 10

Chemistry

1. Water normally boils at 100°C, but it is possible to boil water at room temperature. What variable would you have to change to do this:

Increase external pressure

Decrease temperature

Decrease external pressure

None of these

Question 1 of 10

Question 2 of 10

2. The boiling points of some elements are given below:
(a) Argon → -186°C (b) Nitrogen → -196°C
(c) Oxygen → -183°C (d) Xenon → -108°C
A mixture of the above gases at -210°C was heated by 20°C. Which of the element will still be in the liquid state?

Xenon only

Argon, oxygen and xenon

Oxygen only

Argon, nitrogen and xenon

Question 2 of 10

Question 3 of 10

3. A liquid boils when its vapour pressure becomes equal to

101.325kPa

760 cmHg

1 Pa

0.1atm.

Question 3 of 10

Question 4 of 10

4. Acetone has characteristic fragrant odour and is used to make finger nail polish. It melts at -94°C and boils at 56°C. What is the physical state of acetone at 25°C and 1atm.?

Cannot be predicated

Solid

Liquid

Gas

Question 4 of 10

Question 5 of 10

5. Which is not the property of crystalline solids?

Have well defined shape

Have orderly arrangements of particles

Have repeating three dimensional arrangement of particles

Are generally soft

Question 5 of 10

Question 6 of 10

6. Consider the following table:

Sr. No	X	Y	X/Y
1	1.00	273	0.0037
2	1.37	373	0.0037
3	1.73	473	0.0037
4	2.10	573	0.0037

Which of the following relationships does this table represent?

x ∞ 1/y

x = y

x = 1/y

x ∞ y

Question 6 of 10

Question 7 of 10

7. Bromine has a melting point of -7°C and a boiling point of 59°C. What is the physical state of bromine at 100°C.

Liquid

Solid

Cannot be predicated

Gas

Question 7 of 10

Question 8 of 10

8. In which of the following processes speed of the particles decreases?

Melting

Boiling

Condensation

Sublimation

Question 8 of 10

Question 9 of 10

9. The following table shows the melting and boiling points of four substances. Which substance is a solid at room temperature?

Substance	Melting point (0°C)	Boiling Point(0°C)
A	-186	-183
B	-6	120
C	0	100
D	36	130

C

D

B

A

Question 9 of 10

Question 10 of 10

10. Which statement about the particles of a solid is not correct?

They move at great speeds

There is a very little space between the particles

The forces of attraction between the particles are strong

They are arranged in regular patterns

Question 10 of 10

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