Question 1: Palette 1/33

NEET 2023 MCQ

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

$\mathrm{\left(p+\frac{a n^2}{V}\right)(V-n b)=n R T}$

Question 2: Palette 2/33

NEET 2023 MCQ

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

Question 3: Palette 3/33

NEET 2023 MCQ

Which amongst the following options is correct graphical representation of Boyle's law?

A

B

C

D

Question 4: Palette 4/33

NEET 2022 MCQ

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

Question 5: Palette 5/33

NEET 2022 MCQ

Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture

where p_i = partial pressure of i^th gas

${\chi _i}$ = mole fraction of i^th gas in gaseous mixture where ${\chi _i}$ = mole fraction of i^th gas in gaseous mixture

$p_i^o$ = pressure of i^th 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

${p_i} = {\chi _i}p_i^o$

Question 6: Palette 6/33

NEET 2022 MCQ

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

Question 7: Palette 7/33

NEET 2021 MCQ

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

Question 8: Palette 8/33

NEET 2021 MCQ

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]

A

26.02

B

2.518

C

2.602

D

25.18

Question 9: Palette 9/33

NEET 2020 MCQ

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]

A

12 bar

B

15 bar

C

18 bar

D

9 bar

Question 10: Palette 10/33

NEET 2019 MCQ

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

Question 11: Palette 11/33

NEET 2018 MCQ

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.

Question 12: Palette 12/33

NEET 2018 MCQ

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

Question 13: Palette 13/33

NEET 2016 MCQ

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

Question 14: Palette 14/33

NEET 2015 MCQ

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.

Question 15: Palette 15/33

NEET 2013 MCQ

What is the density of N₂ gas 227^oC 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

Question 16: Palette 16/33

NEET 2013 MCQ

Maximum deviation from ideal gas is expected from

A

CH_4(g)

B

NH_3(g)

C

H_2(g)

D

N_2(g)

Question 17: Palette 17/33

NEET 2012 MCQ

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

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

Question 18: Palette 18/33

NEET 2012 MCQ

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

Question 19: Palette 19/33

NEET 2012 MCQ

Equal volumes of two monoatomic gases, A and B at same temperature and pressure are mixed. The ratio of specific heats (C_p/C_v) of the mixture will be

A

0.83

B

1.50

C

3.3

D

1.67

Question 20: Palette 20/33

NEET 2012 MCQ

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

Question 21: Palette 21/33

NEET 2011 MCQ

A bubble of air is underwater at temperature 15^oC and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25^oC 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

Question 22: Palette 22/33

NEET 2011 MCQ

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

Question 23: Palette 23/33

NEET 2011 MCQ

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

Question 24: Palette 24/33

NEET 2011 MCQ

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

Question 25: Palette 25/33

NEET 2011 MCQ

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

Question 26: Palette 26/33

NEET 2010 MCQ

The pressure exerted by 6.0 g of methane gas in a 0.03 m³ vessel at 129^oC 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

Question 27: Palette 27/33

NEET 2009 MCQ

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

Question 28: Palette 28/33

NEET 2008 MCQ

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

Question 29: Palette 29/33

NEET 2008 MCQ

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.

Question 30: Palette 30/33

NEET 2003 MCQ

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

Question 31: Palette 31/33

NEET 2002 MCQ

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

Question 32: Palette 32/33

NEET 2001 MCQ

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.

Question 33: Palette 33/33

NEET 2000 MCQ

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

KE_CO = KE_N2

B

KE_CO > KE_N2

C

KE_CO < KE_N2

D

cannot be predicted unless volumes of the gases are given