The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

In van der walls crystals, there exists a high degree of stability of the outer electron shell.

A

True

B

False

বাস্তব গ্যাসের ক্ষেত্রে ভ্যানডার ওয়ালস্ সমীকরণে ‘a' ধ্রুবকটি নির্দেশ করে (For a real gas, the constant 'a' in Van der Waals equation indicates)

A

গতি শক্তি (kinetic energy)

B

আন্তঃআণবিক আকর্ষণ (intermolecular attraction)

C

আয়তন (volume)

D

সংনম্যতা (compressibility)

In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

A

Equal to the heat of formation of surface compound

B

Equal to the heat of wetting

C

Zero

D

Called integral heat of adsorption

In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.

A

100

B

1000

C

10000

D

100000

When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

A

Always lower than

B

Always higher than

C

Same as

D

Dependent on the system; can be either lower or higher than

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A

30°

B

60°

C

90°

D

120°

Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.

A

1

B

2.5

C

4

D

6

Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces?

A

RT

B

$${\text{p}} + \frac{{\text{a}}}{{{{\text{V}}^2}}}$$

C

V - b

D

$$\frac{1}{{{\text{RT}}}}$$

Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its

A

Tensile strength

B

Chemical resistance

C

Flexibility

D

All of the above

চিত্রে ∆DER এ DE ⊥ EF হলে DE2 কত বর্গ সে.মি.?

A

6

B

7

C

11

D

4

The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

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