States of Matter Test

Result

States of Matter Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The vapor pressure of different substances at the same temperature increases if

A
the intermolecular forces of the substance are strong.

B
the molecules of the substance are covalent bonded.

C
the molecules of the substance are ionic bonded.

D
the intermolecular forces of the substance are weak.

Solution

Vapour pressure of a substance is inversely proportional to the intermolecular forces between molecules.
Question 2
1 / -0

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:

A
pressure increases

B
pressure decreases

C
temperature decreases

D
temperature increases

Solution

As we move to higher altitude, the atmospheric pressure decreases. Therefore, boiling point of water also decreases, hence , cooking of food takes longer time without using pressure cooker.
Question 3
1 / -0

Which of the following property of water can be used to explain the spherical shape of rain droplets?

A
viscosity

B
pressure

C
surface tension

D
critical phenomena

Solution

Due to surface Tension, the water droplet tends to acquire minimum surface area, hence water droplet attains spherical shape.
Question 4
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The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

A
polarisability of interacting particles

B
strength of permanent dipoles in the particles

C
mass of interacting particles

D
charge of interacting particles

Solution

London dispersion forces operate only over very short distance. The energy of interaction varies as 1/(distance between two interacting particles)⁶.Large or more complex are the molecules, greater is the magnitude of London forces. This is obviously due to the fact that the large electron clouds are easily distorted or polarised. Hence, greater the polarisability of the interacting particles, greater is the magnitude of the interaction energy.
Question 5
1 / -0

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

A
less than unit electronic charge

B
double the unit electronic charge

C
equal to unit electronic charge

D
more than unit electronic charge

Solution

Partial charge is a small charge developed by displacement of electrons. It is less than unit electronic charge and is represented as δ⁺ or δ^–