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NTSE Stage 2 SAT 2018 Exam Question Paper
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© examsnet.com
Question : 15
Total: 100
100 g of oxygen
(
O
2
)
gas and 100 g of helium (He) gas are taken in separate containers of equal volume at 100°C. Which one of the following List I List II (Mixture to be separated) (Method used) A. Petroleum products I. Chromatography B. Camphor and rock salt II. Centrifugation C. Cream from milk III. Sublimation D. Coloured components in a dye IV. Fractional distillation statement is correct?
Both gases would have the same pressure.
The average kinetic energy of
O
2
molecules is greater than that of He moleules.
The pressure of He gas would be greater than that of the
O
2
gas.
The average kinetic energy of He and
O
2
molecules is same.
Validate
Solution:
According to ideal gas equation,
PV=nRT
∴ P ∝ n at constant V and T
n
1
(
O
2
)
=
100
32
=
3.125
m
o
l
e
n
2
(
H
e
)
=
100
4
=
25
m
o
l
e
As
n
2
>
n
1
; thus
P
H
e
>
P
O
2
© examsnet.com
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