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5
MCQ (Single Correct Answer)

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess 'partial charges'. The partial charge is

A
more than unit electronic charge
B
equal to unit electronic charge
C
less than unit electronic charge
D
double the unit electronic charge
6
MCQ (Single Correct Answer)

The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?

A
$0.8 \times 10^5 \mathrm{~atm}$
B
$0.008 \mathrm{Nm}^{-2}$
C
$8 \times 10^4 \mathrm{Nm}^{-2}$
D
0.25 atm
7
MCQ (Single Correct Answer)

As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?

A
Increases
B
Decreases
C
Remains same
D
Becomes half
8
MCQ (Single Correct Answer)

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases H$$_2$$ He O$$_2$$ N$$_2$$
Critical temperature in Kelvin 33.2 5.3 154.3 126

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first

A
$\mathrm{H}_2, \mathrm{He}, \mathrm{O}_2, \mathrm{~N}_2$
B
$\mathrm{He}, \mathrm{O}_2, \mathrm{H}_2, \mathrm{~N}_2$
C
  $\mathrm{N}_2, \mathrm{O}_2, \mathrm{He}, \mathrm{H}_2$
D
$\mathrm{O}_2, \mathrm{~N}_2, \mathrm{H}_2, \mathrm{He}$
9
MCQ (Single Correct Answer)

What is SI unit of viscosity coefficient $(\eta)$ ?

A
Pascal
B
$\mathrm{Nsm}^{-2}$
C
$\mathrm{km}^{-2} \mathrm{~s}$
D
$\mathrm{Nm}^{-2}$
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