ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 3 Gases

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ECAT Chemistry Chapter 3 Gases

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Question # 1

The order of the rate of diffusion of gases NH3,SO2, CL2, and CO2 IS :

Question # 2

In Boyle's law which of the following pair remains constant :

Question # 3

According to Boyle's law. which parameters give a straight line parallel to x-axis, when we plot a graph between

Question # 4

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :

Question # 5

Liquids are less common than :

Question # 6

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

Question # 7

Gases exert pressure on walls of container because the gas molecules

Question # 8

Cooling happens under the Joule Thomson Effect due to sudden

Question # 9

The deviation of a gas from ideal behavior is maximum at :

Question # 10

According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:

Question # 11

The relationships between volume of a given amount of gas and the prevailing conditions of temperature and pressure are

Question # 12

A real gas obeying van der Waals' equation will resemble ideal gas if :

Question # 13

The highest temperature at which a substance can exist as a liquid is called its

Question # 14

Pressure remaining constant, at which temperature volume of gas will become twice of what it is at 0°C ?

Question # 15

Cooling happens under the Joule Thomson Effect due to sudden :

Question # 16

At constant temperature when pressure of a gas is plotted against volume, the curve is

Question # 17

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :

Question # 18

The movement of gas molecules from a region of high pressure to vacuum is called

Question # 19

The product of pressure and volume remains constant when temperature and quantity of gas is

Question # 20

Gases of air always remain in random motion and do not settle due to :

Question # 21

The density of a gas is directly and volume at constant temperature for a gas is

Question # 22

The ratio of volume to temperature on Kelvin scale is constant according to

Question # 23

Which Statement about gases is not correct?

Question # 24

Gases shows uniform behavior toward their :

Question # 25

In solids, the temperature of is the measure of

Question # 26

A graph between P and PV at constant temperature and number of mole is parallel to

Question # 27

The movement of molecules from a region of high pressure to vacuum is called :

Question # 28

Absolute temperature of a gas is proportional to

Question # 29

The graph between pressure and volume at constant temperature for a gas is

Question # 30

The molar value of CO2 is maximum at :

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Sr.# Question Answer
1 Equal masses of methane and oxygen are mixed in an empty container at 25°CThe fraction of total pressure exerted by oxygen is :
A. 1/2
B. 8/9
C. 1/9
D. 16/17
2 The relationships between volume of a given amount of gas and the prevailing conditions of temperature and pressure are
A. Charle's Law
B. Graham's Law
C. Boyle's Law
D. Gas Laws
3 For a gas obeying Boyle's law if pressure is doubled, the volume becomes
A. Remains constant
B. Double
C. One half
D. None of above
4 The highest temperature at which a substance can exist as a liquid is called its
A. Critical temperature
B. Zero temperature
C. Absolute temperature
D. None of above
5 Keeping the temperature constant, if the gas is expanded
A. kinetic energy of molecules will increase
B. Number of gas molecules increases
C. Temperature will increases
D. Pressure will decrease
6

How should condition be changed to prevent the volume of a given gas from expanding whine its mass is increased ?
A. Temperature is lowered and pressure is increased
B. Temperature is increasedand pressure is lowered
C. Temperature and pressure both are lowered
D. Temperature and pressure both are increased
7 If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be
A. Remain unchanged
B. Doubled
C. Reduced
D. Increased four times
8 If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :
A. remain unchanged
B. increase four times
C. reduce to 1/4
D. be doubled
9

Number of molecules in one dm3 of water is close to :
A.

6.02/22.4


B.

12.04/22.4 *1023


C.

18/22.4*1023

D.

55.6*6.02*1023 * 1023
10 A graph between P and PV at constant temperature and number of mole is parallel to
A. y axis
B. z axis
C. x axis
D. pressure axis

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