WBJEE SERIES Chemistry
States Of Matter
9 previous year questions.
Volume: 9 Ques
Yield: Medium
High-Yield Trend
3
2023 1
2018 1
2016 2
2015 1
2014 1
2010 Chapter Questions 9 MCQs
01
PYQ 2010
easy
chemistry ID: wbjee-20
At identical temperature and pressure, the rate of diffusion of hydrogen gas is times that of a hydrocarbon having molecular formula . What is the value of ?
1
1
2
4
3
3
4
8
02
PYQ 2014
medium
chemistry ID: wbjee-20
Two gases (Mol. Wt. ) and (Mol. Wt. ) are at the same temperature T in two different containers. Their root mean square velocities are and respectively. If the average kinetic energies per molecule of two gases and are and respectively, then which of the following relation (s) is (are) true?
1
2
3
4
03
PYQ 2015
medium
chemistry ID: wbjee-20
A gas can be liquefied at temperature and pressure provided
1
and
2
and
3
and
4
and
04
PYQ 2015
medium
chemistry ID: wbjee-20
The RMS velocity of gas molecules at C is approximately . For molecules at the RMS velocity is approximately
1
2000 m/s
2
1414 m/s
3
1000 m/s
4
1500 m/s
05
PYQ 2016
medium
chemistry ID: wbjee-20
Which of the following is the correct option for free expansion of an ideal gas under adiabatic condition?
1
2
3
4
06
PYQ 2018
medium
chemistry ID: wbjee-20
Equal weights of ethane and hydrogen are mixed in an empty container at . The The fraction of total pressure exerted by hydrogen is
1
1:02
2
1:01
3
1:16
4
15:16
07
PYQ 2023
medium
chemistry ID: wbjee-20
Which statement(s) is/are applicable above critical temperature?
1
A gas cannot be liquified
2
The surface tension of a liquid is very high
3
A liq. phase cannot be distinguished from a gas phase.
4
Density changes continuously with P or V.
08
PYQ 2023
medium
chemistry ID: wbjee-20
Case-1: An ideal gas of molecular weight M at temperature T.
Case-2: Another ideal gas of molecular weight 2M at the temperature .
Identify the correct statement in the context of the above two cases.
Case-2: Another ideal gas of molecular weight 2M at the temperature .
Identify the correct statement in the context of the above two cases.
1
Average kinetic energy and average speed will be the same in the two cases.
2
Both the averages are halved
3
Both the averages are doubled.
4
Only average speed is halved in the second case.
09
PYQ 2023
easy
chemistry ID: wbjee-20
The root mean square(rms) speed of X2 gas is x m/s at a given temperature. When the temperature is doubled, the X2 molecules dissociated completely into atoms. The root mean square speed of the sample of gas then becomes (in m/s)
1
2
x
3
2x
4
4x