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States of Matter · Question 14

AIPMT 2015MCQEasy📈 Topic in 0% papers+4−1
1

A gas such as carbon monoxide would be most likely to obey the ideal gas law at

  1. low temperatures and high pressures
  2. high temperatures and high pressures
  3. low temperatures and low pressures
  4. high temperatures and low pressures

Answer

(4) high temperatures and low pressures

Solution

Real gases deviate from ideal behaviour because of intermolecular attractions and the finite volume of molecules.

⇒ At low pressure the gas occupies a large volume, so the volume of the molecules themselves is negligible.

⇒ At high temperature the kinetic energy is large, so intermolecular attractions become negligible.

∴ A real gas such as CO behaves most nearly ideally (Z 1) at high temperatures and low pressures.

Answer: (4)

Out of syllabusAIPMT 2015

Keep practising — States of Matter

2

Dipole-induced dipole interactions are present in which of the following pairs

  1. HCl and He atoms
  2. SiF4 and He atoms
  3. H2O and alcohol
  4. Cl2 and CCl4
NEET 2013
3

Maximum deviation from ideal gas is expected from

  1. CH4(g)
  2. NH3(g)
  3. H2(g)
  4. N2(g)
Out of syllabusNEET 2013
4

What is the density of N2 gas at 227 C and 5.00 atm pressure? (R = 0.082 L atm K-1 mol-1)

  1. 1.40 g/L
  2. 2.81 g/L
  3. 3.41 g/L
  4. 0.29 g/L
Out of syllabusNEET 2013 (Karnataka)
5

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

  1. 27 u
  2. 36 u
  3. 64 u
  4. 9 u
Out of syllabusAIPMT 2012 (Mains)
6

For real gases van der Waals equation is written as (p + an2V2 )(V - nb) = nRT where a and b are van der Waals constants. Two sets of gases are (I) O2, CO2, H2 and He (II) CH4, O2 and H2 The gases given in set-I in increasing order of b and gases given in set-II in decreasing order of a, are arranged below. Select the correct order from the following

  1. (I) He < H2 < CO2 < O2 (II) CH4 > H2 > O2
  2. (I) O2 < He < H2 < CO2 (II) H2 > O2 > CH4
  3. (I) H2 < He < O2 < CO2 (II) CH4 > O2 > H2
  4. (I) H2 < O2 < He < CO2 (II) O2 > CH4 > H2
Out of syllabusAIPMT 2012 (Mains)
7

50 mL of each gas A and of gas B takes 150 and 200 seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

  1. 96
  2. 128.74
  3. 20.25
  4. 64.42
Out of syllabusAIPMT 2012 (Prelims)
8

A bubble of air is underwater at temperature 15 and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25 and the pressure is 1.0 bar, what will happen to the volume of the bubble?

  1. Volume will become greater by a factor of 1.6.
  2. Volume will become greater by a factor of 1.1.
  3. Volume will become smaller by a factor of 0.70.
  4. Volume will become greater by a factor of 2.5.
Out of syllabusAIPMT 2011 (Mains)
9

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

  1. 2.0
  2. 2.8
  3. 4.0
  4. 1.4
Out of syllabusAIPMT 2011 (Prelims)
10

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be

  1. 50.00 u
  2. 12.25 u
  3. 6.50 u
  4. 25.00 u
Out of syllabusAIPMT 2011 (Prelims)
11

A gaseous mixture was prepared by taking equal moles of CO and N2. If the total pressure of the mixture was found to be 1 atmosphere, the partial pressure of the nitrogen (N2) in the mixture is

  1. 0.5 atm
  2. 0.8 atm
  3. 0.9 atm
  4. 1 atm
Out of syllabusAIPMT 2011 (Prelims)

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