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Byju's Answer
Standard XII
Chemistry
Units and Dimensions
Which pressur...
Question
Which pressure is NOT standard pressure?
A
760
t
o
r
r
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B
1
a
t
m
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C
101.325
k
P
a
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D
70
m
m
H
g
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Solution
The correct option is
C
70
m
m
H
g
Standard Pressure is
1
a
t
m
,
101.3
k
P
a
or
760
m
m
H
g
or
t
o
r
r
.
STP is the standard conditions often used for measuring gas density and volume. At STP, 1 mole of any gas occupies 22.4 L.
1
a
t
m
=
101325
P
a
=
760
t
o
r
r
=
760
m
m
H
g
∴
0.987
a
t
m
=
101.325
K
P
a
=
760
t
o
r
r
=
750
m
m
H
g
∴
70
m
m
H
g
is not standard pressure
Hence, option D is correct.
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