Higher the critical temperature, greater will be
the ease of liquification
None of these
A derivation for mean free path of gas.
The number of equidistance oppositely charged ions in a sodium chloride crystal is
When an ideal gas undergoes unrestricted expansion, no cooling takes place because the molecules
Exert no attractive forces on each other
Do work equal to loss of KE
Collide without loss of energy
Are above the inversion temperature
In absence of attractive forces, energy is not
needed to separate molecules from each other on
If air contains N2 and O2 in volume ratio 4 ∶ 1. The average vapour density of air is:
Different gases at the same temperature have same
Number of moles
Average kinetic energy
From kinetic molecular theory of gases, different
gases at the same temperature have same average
A gas at 298 K is shifted from a vessel of 250 cm3 capacity to that of 1 L capacity. The pressure of the gas will
Becomes four times
Decrease by one-fourth
Decrease by half
When a solid vaporizes directly without melting, it is known as:
Solid ⟶ Vapour is called sublimation
The temperature of 20 L of nitrogen was increased from 10 K to 30 K at a constant pressure. Change in volume will be
The van der Waals’ equation for real gas is
All of the above
These are van der Waals’ equations for 1 mole (a)
and n mole gas (b), (c).
Use PM = dRT
Which phrase would be incorrect to use?
A molecule of an element
An atom of an element
A molecule of a compound
None of the above
For an element, term ‘atom’ is used
The ratio of average speed of an oxygen molecule to the rms, speed of a nitrogen molecule at the same temperature is:
Which of the following represents total kinetic energy of one mole of gas?
At 27℃, 500 mL of helium diffuses in 30 min. What is the time (in hours) taken for 1000 mL of SO2 to
diffuse under same experimental conditions?
Space lattice of CaF2 is
Which of the following gases would have the highest rms speed at 0℃ ?
Which one of the following metal oxides is antiferromagnetic in nature?
MnO2 is antiferromagnetic in nature
Which gas contains larger number of molecules?
4 g of H2O
2 g of marsh gas
4 g of PCl5
2 g of phoszene
More is the number of mole, more will be number
Assume that air is 21% oxygen and 79% nitrogen by volume. If the barometric pressure is 740 mm, the
partial pressure of oxygen is closest to which one of the following?
The maximum radius of sphere that can be fitted in the octahedral hole of cubical closed packing of sphere of radius ris
Identify the pair of gases that have equal rates of diffusion
The following is not a function of an impurity present in a crystal
Establishing thermal equilibrium
Having tendency to diffuse
Contributing to scattering
Introducing new electronic energy levels
Addition of impurity does not establish
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