1
WB JEE 2022
+2
-0.5

Let (Crms)H2 is the r.m.s. speed of H2 at 150 K. At what temperature, the most probable speed of helium [Cmp)He] will be half of (Crms)H2 ?

A
75 K
B
112.5 K
C
225 K
D
900 K
2
WB JEE 2021
+1
-0.25
Molecular velocities of two gases at the same temperature (T) are u1 and u2. Their masses are m1 and m2 respectively. Which of the following expressions is correct at temperature T?
A
$${{{m_1}} \over {u_1^2}} = {{{m_2}} \over {u_2^2}}$$
B
$${m_1}{u_1} = {m_2}{u_2}$$
C
$${{{m_1}} \over {{u_1}}} = {{{m_2}} \over {{u_2}}}$$
D
$${m_1}u_1^2 = {m_2}u_2^2$$
3
WB JEE 2020
+1
-0.25
At 273 K temperature and 76 cm Hg pressure the density of a gas is 1.964 g L-1. The gas is
A
CH4
B
CO
C
He
D
CO2
4
WB JEE 2019
+1
-0.33
For a van der Waals' gas, the term $$\left( {{{ab} \over {{V^2}}}} \right)$$ represents some
A
pressure
B
energy
C
critical density
D
molar mass
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
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Calculus
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