This document contains a series of chemistry questions related to gases and their properties. It begins by providing a discount code for a subscription, and then lists 25 multiple choice questions about topics like gas laws, molecular mass, partial pressures, and the relationship between temperature and gas properties. The questions are formatted as flashcards with the question, possible answers, and occasionally a brief explanation or formula.

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Q.1
Equal moles of hydrogen and oxygen gases are placed in a
container with a pin-hole through which both can escape.
What fraction of the oxygen escapes in the time required
for one-half of the hydrogen to escape ?
1) 1/4 (2) 3/8
(3) ½ (4) 1/4

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Q.2
Equal masses of H2 , O2 and methane have been taken in
a container of volume V at temperature 27ºC in identical
conditions. The ratio of the volumes of gases H2 : O2 :
methane would be:

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Q.3
Maximum deviation from ideal gas is expected
from :
(1) H2(g) (2) N2(g)
(3) CH4(g) (4) NH3(g)

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Q.4
A certain gas takes three times as long to effuse
out as helium. Its molecular mass will be:
(1) 36 u (2) 64 u
(3) 9 u (4) 27 u

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Q.5

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Q.6
At 100 ºC a gas has 1 atm. pressure and 10 L
volume. Its volume at NTP would be
(1) 10 litres (2) Less than 10litres
(3) More than 10 litres (4)None

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Q.7
If 500 ml of a gas 'A' at 1000 torr and 1000 ml of
gas B at 800 torr are placed in a 2L container, the
final pressure will be
(1) 100 torr (2) 650 torr
(3) 1800 torr (4) 2400 torr

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Q.8
When does a gas deviate the most from its ideal
behaviour ?
(A) Al low pressure and low temperature
(B) At high pressure and low temperature
(C) At high pressure and high temperature
(D) At low pressure and high temperature

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Q.9
The ratio of masses of oxygen and nitrogen in a
particular gaseous mixture is 1 : 4. The ratio of number
of their molecule is
(A) 7 : 32 (B) 1 : 8
(C) 3 : 16 (D) 1 : 4

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Q.10
The initial volume of a gas cylinder is 750.0 Ml . If the
pressure of gas inside the cylinder changes from 840.0
mm Hg to 360.0 mm Hg. The final volume the gas will be :
[JEE Main Online - 2014]
(A) 1.750 L (B) 3.60 L
(C) 4.032 L (D) 7.50 L

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Q.11
The temperature at which oxygen molecules have the
same root mean square speed as helium atoms have at
300 K is

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Q.12
By how many folds the temperature of a gas would
increase when the root mean square velocity of the gas
molecules in a container of fixed volume is increased from
5 × 104 cm/s to 10 * 104 cm/s

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Q.13
When r, P and M represent rate of diffusion, pressure
and molecular mass, respectively, then the ratio of the
rates of diffusion (rA /rB) of two gases A and B, is given

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Q.14
Equal masses of methane and oxygen are mixed in
an empty container at 25ºC. The fraction of the
total pressure exerted by oxygen is

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Q.15

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Q.16
Distribution of molecules with velocity is
represented by the curve :
Velocity corresponding to point A is

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Q.17 For the different ideal gases versus
P variations at definite temperature

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Q.18
Which of the following graph is/are correct
as per Charles law ?
(D) Both (B) and (C)
are correct

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Q.19
Which of the following represent log P vs log V
variation as per Boyle’s law ?

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Q.20

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Q.21

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Q.22

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Q.23
A gaseous mixture was prepared by taking equal
mole of CO and N2. If the total pressure of the
mixture was found 1 atmosphere, the partial
pressure of the nitrogen (N2) in the mixture is
(1) 1 atm (2) 0.5 atm
(3) 0.8 atm (4) 0.9 atm

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Q.24
By what factor does the average velocity of a
gaseous molecule increase when the temperature
(in Kelvin) is doubled ?
[AIPMT-2011]
(1) 1.4 (2) 2.0
(3) 2.8 (4) 4.0

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Q.25
The temerpature of the gas is raised from 27°C to
927°, the root mean square velocity is

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Q.26
The density of a gas at 27°C and 1 atm is d.
Pressure remaining constant, at which of the
following temperatures will its density become
0.75 d

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Q.30

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