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Deviation from ideal behaviour and compressibility factor
NEET level
Single correct option
Difficulty 1 of 3
rg001
The compressibility factor
Z
of a gas is defined as
Z
=
n
RT
P
V
. For an ideal gas at all pressures and temperatures,
Z
is
A
zero
B
exactly 1
C
greater than 1
D
less than 1
Answer: B
For an ideal gas
P
V
=
n
RT
holds exactly, so
Z
=
P
V
/
n
RT
=
1
at every pressure and temperature. Any departure of
Z
from 1 measures non-ideal behaviour.
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