# Solved papers for NEET Chemistry States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव NEET PYQ-States Of Matter

### done NEET PYQ-States Of Matter Total Questions - 21

• question_answer1) At $25{}^\circ C$ and 730 mm pressure, 380 mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?                                                                      [AIPMT 1999]

A)
365 mL

B)
2 g

C)
10 g

D)
20 g

• question_answer2) Which one of the following statements is wrong for gases?                            [AIPMT 1999]

A)
Gases do not have a definite shape and volume

B)
Volume of the gas is equal to volume of container confining the gas

C)
Confirmed gas exerts uniform pressure on the walls of its container in all directions

D)
Mass of gas cannot be determined by weighing a container in which it is enclosed

• question_answer3) Which of the following expressions correctly represents the relationship between the average molar kinetic energy, $\overline{KE},$ of CO and ${{N}_{2}}$ molecules at the same temperature?                    [AIPMT 2000]

A)
${{\overline{KE}}_{\,CO}}\,<\,{{\overline{KE}}_{{{N}_{2}}}}$

B)
${{\overline{KE}}_{\,CO}}\,>\,{{\overline{KE}}_{{{N}_{2}}}}$

C)
${{\overline{KE}}_{\,CO}}\,=\,{{\overline{KE}}_{{{N}_{2}}}}$

D)
Cannot be predicted unless volumes of die gases are given

• question_answer4) Van der Waal's real gas, act as an ideal gas, at which condition?                                       [AIPMT 2002]

A)
High temperature, low pressure

B)
Low temperature, high pressure

C)
High temperature, height pressure

D)
Low temperature, low pressure

• question_answer5) If a gas expands at constant temperature, it indicates that                                                    [AIPMT (S) 2008]

A)
kinetic energy-of molecules decreases

B)
pressure of the gas increases

C)
kinetic energy of molecules remains the same

D)
number of the molecules of gas increases

• question_answer6)  The pressure exerted by 6.0 g of methane gas in a $0.03\text{ }{{m}^{3}}$ vessel at $129{}^\circ C$ is (Atomic masses:                                                                                                                                    [AIPMT (M) 2010] $C=12.01,H=1.01\,$ and $R=8.314J{{K}^{-1}}\,mo{{l}^{-1}}$

A)
215216 Pa

B)
13409 Pa

C)
41648 Pa

D)
31684 Pa

• question_answer7) A gaseous mixture was prepared by taking equal moles of CO and  ${{N}_{2}}$. If the total pressure of the mixture was found 1 atmosphere the partial pressure of the nitrogen $({{N}_{2}})$ in the mixture is       [AIPMT (S) 2011]

A)
0.8 atm

B)
0.9 atm

C)
1 atm

D)
0.5 atm

• question_answer8) 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                                                       [AIPMT (S) 2011]

A)
12.25 u

B)
6.50 u

C)
25.00 u

D)
50.00 u

• question_answer9) By what factor does the average velocity of a gaseous   molecule   increase   when   the temperature (in Kelvin) is doubled?                                                                                                                              [AIPMT (S) 2011]

A)
2.8

B)
4.0

C)
1.4

D)
2.0

• question_answer10) A bubble of air is underwater at temperature $15{}^\circ C$ and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is $25{}^\circ C$ and the pressure is 1.0 bar, what will happen to the volume of the bubble?      [AIPMT (M) 2011]

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 2.9

• question_answer11) 50 mL of each gas A and of gas B takes 150 and 200 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be                                     [AIPMT (S) 2012]

A)
96

B)
128

C)
32

D)
64

• question_answer12) A certain gas takes three times as long to effuse out as helium. Its molecular mass will be          [AIPMT (M) 2012]

A)
27 u

B)
36 u

C)
64 u

D)
9 u

• question_answer13)                For real gases van der Waals' equation is. Written as $\left( p+\frac{a{{n}^{2}}}{{{V}^{2}}} \right)(V-nb)=n\,RT$ written where, a and b are van der Waals' constants.                                                [AIPMT (M) 2012] Two sets of gases are $I.{{O}_{2}},C{{O}_{2}},{{H}_{2}}$ and He $II.C{{H}_{4}},{{O}_{2}}$ and ${{H}_{2}}$ 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)
$\text{(I)}\,He\,<\,{{H}_{2}}<\,C{{O}_{2}}<\,{{O}_{2}}$$\text{(II})\,C{{H}_{4}}\,>\,{{H}_{2}}>\,{{O}_{2}}$

B)
$\text{(I)}\,\,{{O}_{2}}<\,He\,\,<\,{{H}_{2}}<\,C{{O}_{2}}$$\text{(II})\,\,{{H}_{2}}>\,{{O}_{2}}\,\,>\,C{{H}_{4}}$

C)
$\text{(I)}\,\,{{H}_{2}}<\,He\,\,<\,{{O}_{2}}<\,C{{O}_{2}}$$\text{(II)}\,C{{H}_{4}}>\,{{O}_{2}}>\,{{H}_{2}}$

D)
$\text{(I)}\,{{H}_{2}}<\,{{O}_{2}}<\,He\,<\,C{{O}_{2}}$$\text{(II})\,\,{{O}_{2}}>\,C{{H}_{2}}\,>\,{{H}_{2}}$

• question_answer14)   Maximum deviation from ideal gas is expected from                                                [NEET 2013]

A)
${{H}_{2}}(g)$

B)
${{N}_{2}}(g)$

C)
$C{{H}_{2}}(g)$

D)
$N{{H}_{3}}(g)$

• question_answer15) Equal masses of ${{H}_{2}},{{O}_{2}},$ and methane have been taken in a container of volume V at temperature $27{}^\circ C$ in identical conditions. The ratio of the volumes of gases ${{H}_{2}}:{{O}_{2}}:C{{H}_{4}}$ would be [AIPMT 2014]

A)
8 : 16 : 1

B)
16 : 8 : 1

C)
16 : 1: 2

D)
8 : 1 : 2

• question_answer16) A mixture of gases contains ${{H}_{2}}$ and ${{O}_{2}}$ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?                                                                                     [NEET 2015 ]

A)
1 : 4

B)
4 : 1

C)
16 : 1

D)
2 : 1

• question_answer17) A gas such as carbon monoxide would be most likely to obey the ideal gas law at                      [NEET 2015 (Re)]

A)
high temperatures and low pressures

B)
low temperatures and high pressures

C)
high temperatures and high pressures

D)
low temperatures and low pressures

• question_answer18) 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 one-half of the hydrogen to escape?       [NEET - 2016]

A)
1/8

B)
1/4

C)
3/8

D)
1/2

• question_answer19) Given van der Waals constant for $\text{N}{{\text{H}}_{\text{3}}}\text{,}{{\text{H}}_{\text{2}}}\text{,}{{\text{O}}_{\text{2}}}$ and $\text{C}{{\text{O}}_{2}}$ are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?                                                                                                           [NEET - 2018]

A)
${{\text{O}}_{\text{2}}}$

B)
${{\text{H}}_{\text{2}}}$

C)
$\text{N}{{\text{H}}_{3}}$

D)
$\text{C}{{\text{O}}_{\text{2}}}$

• question_answer20) The correction factor 'a' to the ideal gas equation corresponds to                                [NEET - 2018]

A)
Electric field present between the gas molecules

B)
Volume of the gas molecules

C)
Density of the gas molecules

D)
Forces of attraction between the gas molecules

• question_answer21) 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-                              [NEET 2019]

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