2023
NEET
MCQ
NEET 2023 Manipur
The correct van der Waals equation for 1 mole of a real gas is :
A.
$\mathrm{\left(p+\frac{a}{V^2}\right)(V-b)=R T}$
B.
$\mathrm{\left(p+\frac{V^2}{a}\right)(V-b)=R T}$
C.
$\mathrm{\left(p+\frac{a^2}{V^2}\right)\left(V^2-n b\right)=R T}$
D.
$\mathrm{\left(p+\frac{a n^2}{V}\right)(V-n b)=n R T}$
2023
NEET
MCQ
NEET 2023 Manipur
The correct option in which the density of argon (Atomic mass = 40) is highest:
A.
STP
B.
0$^\circ$C, 2 atm
C.
0$^\circ$C, 4 atm
D.
273$^\circ$C, 4 atm
2023
NEET
MCQ
NEET 2023
Which amongst the following options is correct graphical representation of Boyle's law?
A.
B.
C.
D.
2022
NEET
MCQ
NEET 2022 Phase 2
Four gas cylinders containing He, N2, CO2 and NH3 gases separately are gradually cooled from a temperature of 500 K. Which gas will liquify first?
(Given Tc in K $-$ He : 5.3, N2 : 126, CO2 : 304.1 and NH3 : 405.5)
A.
NH3
B.
He
C.
N2
D.
CO2
2022
NEET
MCQ
NEET 2022 Phase 1
Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture
where pi = partial pressure of ith gas
${\chi _i}$ = mole fraction of ith gas in gaseous mixture where ${\chi _i}$ = mole fraction of ith gas in gaseous mixture
$p_i^o$ = pressure of ith gas in pure state
A.
$p = {p_1} + {p_2} + {p_3}$
B.
$p = {n_1}{{RT} \over V} + {n_2}{{RT} \over V} + {n_3}{{RT} \over V}$
C.
${p_i} = {\chi _i}p$
D.
${p_i} = {\chi _i}p_i^o$
2022
NEET
MCQ
NEET 2022 Phase 1
A 10.0 L flask contains 64 g of oxygen at 27$^\circ$C. (Assume O2 gas is behaving ideally). The pressure inside the flask in bar is (Given R = 0.0831 L bar K$-$1 mol$-$1)
A.
2.5
B.
498.6
C.
49.8
D.
4.9
2021
NEET
MCQ
NEET 2021
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures :
A.
B.
C.
D.
2021
NEET
MCQ
NEET 2021
Choose the correct option for the total pressure (in atm.) in a mixture of 4g O2 and 2g H2 confined in a total volume of one litre at 0$^\circ$C is :
[Given R = 0.082 L atm mol$-$1K$-$1, T = 273 K]
[Given R = 0.082 L atm mol$-$1K$-$1, T = 273 K]
A.
26.02
B.
2.518
C.
2.602
D.
25.18
2020
NEET
MCQ
NEET 2020 Phase 1
A mixture of N2 and Ar gases in a cylinder contains 7g of N2 and 8g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is :
[Use atomic masses (in g mol$ - $1) : N = 14, Ar = 40]
[Use atomic masses (in g mol$ - $1) : N = 14, Ar = 40]
A.
12 bar
B.
15 bar
C.
18 bar
D.
9 bar
2019
NEET
MCQ
NEET 2019
A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same
conditions. The correct option about the gas and its compressibility factor (Z) is -
A.
Z < 1 and attractive forces are dominant
B.
Z < 1 and repulsive forces are dominant
C.
Z > 1 and attractive forces are dominant
D.
Z > 1 and repulsive forces are dominant
2018
NEET
MCQ
NEET 2018
The correction factor ‘a’ to the ideal gas
equation corresponds to
A.
density of the gas molecules
B.
volume of the gas molecules
C.
electric field present between the gas
molecules
D.
forces of attraction between the gas
molecules.
2018
NEET
MCQ
NEET 2018
Given van der Waals’ constant for NH3
, H2,
O2
and CO2
are respectively 4.17, 0.244, 1.36
and 3.59, which one of the following gases is
most easily liquefied?
A.
NH3
B.
H2
C.
O2
D.
CO2
2016
NEET
MCQ
NEET 2016 Phase 1
Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for onehalf of the hydrogen to escape?
A.
3/8
B.
1/2
C.
1/8
D.
1/4
2015
NEET
MCQ
AIPMT 2015
A gas such as carbon monoxide would be most likely to obey the ideal gas law at
A.
low temperaures and high pressures
B.
high temperatures and hgh pressures
C.
low temperatures and low pressures
D.
high temperature and low pressures.
2013
NEET
MCQ
NEET 2013 (Karnataka)
What is the density of N2 gas 227oC and 5.00 atm. pressure? (R = 0.082 L atm K$-$1 mol$-$1)
A.
1.40 g/mL
B.
2.81 g/mL
C.
3.41 g/mL
D.
0.29 g/mL
2013
NEET
MCQ
NEET 2013
Maximum deviation from ideal gas is expected from
A.
CH4(g)
B.
NH3(g)
C.
H2(g)
D.
N2(g)
2012
NEET
MCQ
AIPMT 2012 Mains
For real gases van der Waals equation is written as
$\left( {p + {{a{n^2}} \over {{V^2}}}} \right)$ (V $-$ nb) = n RT
where $a$ and $b$ are van der Waals constants. Two sets of gases are
(I) O2, CO2, H2 and He
(II) CH4. O2 and H2
The gases given in set-I in increasing order of b and gases given in set-II in decreasing order of $a$, are arranged below. Select the correct order from the following
$\left( {p + {{a{n^2}} \over {{V^2}}}} \right)$ (V $-$ nb) = n RT
where $a$ and $b$ are van der Waals constants. Two sets of gases are
(I) O2, CO2, H2 and He
(II) CH4. O2 and H2
The gases given in set-I in increasing order of b and gases given in set-II in decreasing order of $a$, are arranged below. Select the correct order from the following
A.
(I) He < H2 < CO2 < O2 (II) CH4 > H2 > O2
B.
(I) O2 < He < H2 < CO2 (II) H2 > O2 > CH4
C.
(I) H2 < He < O2 < CO2 (II) CH4 > O2 > H2
D.
(I) H2 < O2 < He < CO2 (II) O2 > CH4 > H2
2012
NEET
MCQ
AIPMT 2012 Mains
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be
A.
27 u
B.
36 u
C.
64 u
D.
9 u
2012
NEET
MCQ
AIPMT 2012 Mains
Equal volumes of two monoatomic gases, A and B at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be
A.
0.83
B.
1.50
C.
3.3
D.
1.67
2012
NEET
MCQ
AIPMT 2012 Prelims
50 mL of each gas A and of gas B takes 150 and 200 seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gass A will be
A.
96
B.
128.74
C.
20.25
D.
64.42
2011
NEET
MCQ
AIPMT 2011 Mains
A bubble of air is underwater at temperature 15oC and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25oC and the pressure is 1.0 bar, what will happen to the volume of the bubble?
A.
Volume will become greater by a factor of 1.6.
B.
Volume will become greater by a factor of 1.1
C.
Volume will become smaller by a factor of 0.70
D.
Volume will become greater by a factor of 2.5
2011
NEET
MCQ
AIPMT 2011 Prelims
In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mLof nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (aqueous tension at 300 K = 15 mm).
A.
15.45
B.
16.45
C.
17.45
D.
14.45
2011
NEET
MCQ
AIPMT 2011 Prelims
Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be
A.
50.00 u
B.
12.25 u
C.
6.50 u
D.
25.00 u
2011
NEET
MCQ
AIPMT 2011 Prelims
By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled ?
A.
2.0
B.
2.8
C.
4.0
D.
1.4
2011
NEET
MCQ
AIPMT 2011 Prelims
A gaseous mixture was prepared by taking equal mole of CO and N2. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N2) in the mixture is
A.
0.5 atm
B.
0.8 atm
C.
0.9 atm
D.
1 atm
2010
NEET
MCQ
AIPMT 2010 Mains
The pressure exerted by 6.0 g of methane gas in a 0.03 m3 vessel at 129oC is (Atomic masses : C = 12.01, H = 1.01 and R = 8.314 J K$-$1 mol$-$1 )
A.
215216 Pa
B.
13409 Pa
C.
41648 Pa
D.
31684 Pa
2009
NEET
MCQ
AIPMT 2009
The energy absorbed by each molecule (A2) of a substance is 4.4 $ \times $ 10$-$19 J and bond energy per molecule is 4.0 $ \times $ 10$-$19 J. The kinetic energy of the molecule per atom will be
A.
2.2 $ \times $ 10$-$19 J
B.
2.0 $ \times $ 10$-$19 J
C.
4.0 $ \times $ 10$-$20 J
D.
2.0 $ \times $ 10$-$20 J
2008
NEET
MCQ
AIPMT 2008
Volume occupied by one molecule of water (density = 1 g cm$-$3) is
A.
3.0 $ \times $ 10$-$23 cm3
B.
5.5 $ \times $ 10$-$23 cm3
C.
9.0 $ \times $ 10$-$23 cm3
D.
6.023 $ \times $ 10$-$23 cm3
2008
NEET
MCQ
AIPMT 2008
If a gas expands at constant temperature, it indicates that
A.
kinetic energy of molecules remains the same
B.
number of the molecules of gas increases
C.
kinetic energy of molecules decreases
D.
pressure of the gas increases.
2003
NEET
MCQ
AIPMT 2003
In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture underthe aforesaid condition in the end ?
A.
20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen
B.
10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
C.
20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen
D.
20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
2002
NEET
MCQ
AIPMT 2002
Van der Waal's real gas, acts as an ideal gas, at which conditions?
A.
High temperature, low pressure
B.
Low temperature, high pressure
C.
High temperature, high pressure
D.
Low temperature, low pressure
2001
NEET
MCQ
AIPMT 2001
The beans are cooked earlier in pressure cooker because
A.
boiling point increases with increasing pressure
B.
boiling point decreases with increasing pressure
C.
extra pressure of pressure cooker softens the beans
D.
internal energy is not lost while coocking in pressure cooker.
2000
NEET
MCQ
AIPMT 2000
Which of the following expressions correctly
represents the relationship between the average
molar kinetic energy, KE, of CO and N2 molecules
at the same temperature ?
A.
KECO = KEN2
B.
KECO > KEN2
C.
KECO < KEN2
D.
cannot be predicted unless volumes of the
gases are given