# Reduced pressure is

1.  Always less than atmospheric pressure

2.  Always unity

3.  An index of molecular position of a gas

4.   Dimensionless

4

Dimensionless

Explanation :
No Explanation available for this question

# Which of the following statement about van derwaal’s equation is valid

1.  It is valid for all pressures and temperatures

2.  It represents a straight line on pv versus v plot

3.  It has three roots of identical value at the critical point

4.  The equation is valid for diatomic gases only

4

It has three roots of identical value at the critical point

Explanation :
No Explanation available for this question

# A liquid is boiling in a airtight vessel. Using an exhaust tube the vapour is pumped out at a faster rate. What will happen to the liquid

1.  Temperature will go down but boiling will continue

2.  Temperature will rise and boiling will continue

3.  Boling will stop

4.  Whatever vapour will condense.

4

Temperature will go down but boiling will continue

Explanation :
No Explanation available for this question

# When d is the diameter of the molecules of a gas in a confined space, the collision frequency will be proportional to

1.  d

2.  1/d

3.  d2

4.  1/d2

4

d2

Explanation :
No Explanation available for this question

# The inversion temperature Ti of gas is related to the Van der Waal’s constant’s as

1.  Ti=8a/27R.b

2.  Ti= 27R.b/8a

3.  Ti= 2R.b/8a

4.  Ti= 2a/ R.b

4

Ti= 2a/ R.b

Explanation :
No Explanation available for this question

# For a mixture of solid, liquid and vapour phases of a pure substance, in equilibrium, the number of independent intrinsic properties, needed will be

1.  0

2.  1

3.  2

4.  3

4

0

Explanation :
No Explanation available for this question

# In the Van der Waal’s equation (p+a/V2) (V-b) = RT. The greater the value of constant’s

1.  Closer the gas is to the ideal conditions

2.  Lesser are the forces of cohesion

3.  Easier is to liquefy the gas

4.  Higher is the density of the gas

4

Easier is to liquefy the gas

Explanation :
No Explanation available for this question

# The entropy of a mixture of ideal gases is the sum of the entropies constituents evaluated at

1.  Temperature and pressure of the mixture

2.  Temperature of the mixture and the partial pressure of constituents

3.  Temperature and volume of the mixture

4.  Pressure and volume of the mixture

4

Temperature of the mixture and the partial pressure of constituents

Explanation :
No Explanation available for this question

# A system is used is said to be consisting of a pure substance when

1.  It is homogeneous in composition

2.  It is homogeneous and in variable in chemical aggregation

3.  It has only one phase

4.  It has more than one phase

4

It is homogeneous and in variable in chemical aggregation

Explanation :
No Explanation available for this question

# At its critical point, any substance will

1.  Exist all the three phases simultaneously

2.  Change directly from solid to vapour

3.  Lose phase distinction between liquid and vapour

4.  Behave as an ideal gas

4