-
question_answer1)
The Vander Waal's equation explains the behaviour of [DPMT 1981]
A)
Ideal gases done
clear
B)
Real gases done
clear
C)
Vapour done
clear
D)
Non-real gases done
clear
View Solution play_arrow
-
question_answer2)
Gases deviate from the ideal gas behaviour because their molecules [NCERT 1981]
A)
Possess negligible volume done
clear
B)
Have forces of attraction between them done
clear
C)
Are polyatomic done
clear
D)
Are not attracted to one another done
clear
View Solution play_arrow
-
question_answer3)
The compressibility factor of a gas is defined as \[Z=PV/RT\]. The compressibility factor of ideal gas is [Pb. CET 1986]
A)
0 done
clear
B)
Infinity done
clear
C)
1 done
clear
D)
?1 done
clear
View Solution play_arrow
-
question_answer4)
In Vander Waal's equation of state for a non-ideal gas, the term that accounts for intermolecular forces is [CBSE PMT 1990; IIT 1988]
A)
\[(V-b)\] done
clear
B)
\[{{(RT)}^{-1}}\] done
clear
C)
\[\left( P+\frac{a}{{{V}^{2}}} \right)\] done
clear
D)
RT done
clear
View Solution play_arrow
-
question_answer5)
Vander Waal's equation of state is obeyed by real gases. For n moles of a real gas, the expression will be [IIT 1992; Pb. CET 1986; DPMT 1986]
A)
\[\left( \frac{P}{n}+\frac{na}{{{V}^{2}}} \right)\,\,\left( \frac{V}{n-b} \right)=RT\] done
clear
B)
\[\left( P+\frac{a}{{{V}^{2}}} \right)\,(V-b)=nRT\] done
clear
C)
\[\left( P+\frac{na}{{{V}^{2}}} \right)\,(nV-b)=nRT\] done
clear
D)
\[\left( P+\frac{{{n}^{2}}a}{{{V}^{2}}} \right)\,(V-nb)=nRT\] done
clear
View Solution play_arrow
-
question_answer6)
Any gas shows maximum deviation from ideal gas at [CPMT 1991]
A)
\[{{0}^{o}}C\] and 1 atmospheric pressure done
clear
B)
\[{{100}^{o}}C\] and 2 atmospheric pressure done
clear
C)
\[-{{100}^{o}}C\] and 5 atmospheric pressure done
clear
D)
\[{{500}^{o}}C\] and 1 atmospheric pressure done
clear
View Solution play_arrow
-
question_answer7)
The temperature at which the second virial coefficient of real gas is zero is called [AFMC 1993]
A)
Critical temperature done
clear
B)
Eutetic point done
clear
C)
Boiling point done
clear
D)
Boyle's temperature done
clear
View Solution play_arrow
-
question_answer8)
When is deviation more in the behaviour of a gas from the ideal gas equation \[PV=nRT\] [DPMT 1981; NCERT 1982; CBSE PMT 1993]
A)
At high temperature and low pressure done
clear
B)
At low temperature and high pressure done
clear
C)
At high temperature and high pressure done
clear
D)
At low temperature and low high pressure done
clear
View Solution play_arrow
-
question_answer9)
Vander Waal's constants 'a' and 'b' are related with..... respectively [RPMT 1994]
A)
Attractive force and bond energy of molecules done
clear
B)
Volume and repulsive force of molecules done
clear
C)
Shape and repulsive forces of molecules done
clear
D)
Attractive force and volume of the molecules done
clear
View Solution play_arrow
-
question_answer10)
Gas deviates from ideal gas nature because molecules [CPMT 1996]
A)
Are colourless done
clear
B)
Attract each other done
clear
C)
Contain covalent bond done
clear
D)
Show Brownian movement done
clear
View Solution play_arrow
-
question_answer11)
The Vander Waal's equation reduces itself to the ideal gas equation at [Kerala MEE 2001; CBSE PMT 2002]
A)
High pressure and low temperature done
clear
B)
Low pressure and low temperature done
clear
C)
Low pressure and high temperature done
clear
D)
High pressure and high temperature done
clear
View Solution play_arrow
-
question_answer12)
The compressibility factor for an ideal gas is [IIT 1997]
A)
1.5 done
clear
B)
1.0 done
clear
C)
2.0 done
clear
D)
¥ done
clear
View Solution play_arrow
-
question_answer13)
When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules IzIT 1984, 89]
A)
Are above the inversion temperature done
clear
B)
Exert no attractive force on each other done
clear
C)
Do work equal to loss in kinetic energy done
clear
D)
Collide without loss of energy done
clear
View Solution play_arrow
-
question_answer14)
A gas is said to behave like an ideal gas when the relation \[PV/T=\text{constant}\]. When do you expect a real gas to behave like an ideal gas [IIT 1999; CBSE PMT 1990; CPMT 1991]
A)
When the temperature is low done
clear
B)
When both the temperature and pressure are low done
clear
C)
When both the temperature and pressure are high done
clear
D)
When the temperature is high and pressure is low done
clear
View Solution play_arrow
-
question_answer15)
A real gas most closely approaches the behaviour of an ideal gas at [KCET 1992]
A)
15 atm and 200 K done
clear
B)
1 atm and 273 K done
clear
C)
0.5 atm and 500 K done
clear
D)
15 atm and 500 K done
clear
View Solution play_arrow
-
question_answer16)
The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called [AFMC 1993; IIT 1981, 94]
A)
Critical temperature done
clear
B)
Boyle temperature done
clear
C)
Inversion temperature done
clear
D)
Reduced temperature done
clear
View Solution play_arrow
-
question_answer17)
At low pressure, the Vander Waal's equation is reduced to
A)
\[Z=\frac{p{{V}_{m}}}{RT}=1-\frac{ap}{RT}\] done
clear
B)
\[Z=\frac{p{{V}_{m}}}{RT}=1+\frac{b}{RT}p\] done
clear
C)
\[p{{V}_{m}}=RT\] done
clear
D)
\[Z=\frac{p{{V}_{m}}}{RT}=1-\frac{a}{RT}\] done
clear
View Solution play_arrow
-
question_answer18)
At high temperature and low pressure, the Vander Waal's equation is reduced to
A)
\[\left( p+\frac{a}{V_{m}^{2}} \right)\,({{V}_{m}})=RT\] done
clear
B)
\[p{{V}_{m}}=RT\] done
clear
C)
\[p({{V}_{m}}-b)=RT\] done
clear
D)
\[\left( p+\frac{a}{V_{m}^{2}} \right)\,({{V}_{m}}-b)=RT\] done
clear
View Solution play_arrow
-
question_answer19)
When helium is allowed to expand into vacuum, heating effect is observed. Its reason is that [CPMT 1987]
A)
Helium is an ideal gas done
clear
B)
Helium is an inert gas done
clear
C)
The inversion temperature of helium is very low done
clear
D)
The boiling point of helium is the lowest among the elements done
clear
View Solution play_arrow
-
question_answer20)
In van der Waal?s equation of state of the gas law, the constant ?\[b\]? is a measure of [AIEEE 2004]
A)
Volume occupied by the molecules done
clear
B)
Intermolecular attraction done
clear
C)
Intermolecular repulsions done
clear
D)
Intermolecular collisions per unit volume done
clear
View Solution play_arrow
-
question_answer21)
In which molecule the vander Waal?s force is likely to be the most important in determining the m.pt. and b.pt. [DPMT 2000]
A)
\[{{H}_{2}}S\] done
clear
B)
\[B{{r}_{2}}\] done
clear
C)
\[HCl\] done
clear
D)
\[CO\] done
clear
View Solution play_arrow
-
question_answer22)
Pressure exerted by 1 mole of methane in a 0.25 litre container at 300K using vander Waal's equation (given \[1=2.253\,atm\,{{l}^{2}}\,mo{{l}^{-2}},\,b=0.0428\,lit\,mo{{l}^{-1}})\] is [Orissa JEE 2005]
A)
82.82 atm done
clear
B)
152.51 atm done
clear
C)
190.52 atm done
clear
D)
70.52 atm done
clear
View Solution play_arrow