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

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5
• Chemistry
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Question 1 of 10

Chemistry

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

The forces of attraction between the particles are strong

They move at great speeds

They are arranged in regular patterns

There is a very little space between the particles

Question 1 of 10

Question 2 of 10

2. 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.?

Gas

Liquid

Cannot be predicated

Solid

Question 2 of 10

Question 3 of 10

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

101.325kPa

760 cmHg

0.1atm.

1 Pa

Question 3 of 10

Question 4 of 10

4. 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 = y

x = 1/y

x ∞ y

x ∞ 1/y

Question 4 of 10

Question 5 of 10

5. 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

Oxygen only

Argon, oxygen and xenon

Argon, nitrogen and xenon

Question 5 of 10

Question 6 of 10

6. 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

A

D

B

C

Question 6 of 10

Question 7 of 10

7. 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

None of these

Decrease temperature

Decrease external pressure

Question 7 of 10

Question 8 of 10

8. 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.

Cannot be predicated

Liquid

Gas

Solid

Question 8 of 10

Question 9 of 10

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

Sublimation

Melting

Boiling

Condensation

Question 9 of 10

Question 10 of 10

10. Which is not the property of crystalline solids?

Have repeating three dimensional arrangement of particles

Have well defined shape

Have orderly arrangements of particles

Are generally soft

Question 10 of 10

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