For real gases van der Waal's equation is written as,
where, a and b are van der Waal's constants.
Two sets of gases are
I. O2, CO2, H2 and He
II. CH4, O2, and H2
The gases given in set- I increasing order of 'b' and gases given in set -II in decreasing order of 'a' are arranged below. Select the correct order from the following.
-
(I) He < H2 < CO2 < O2
(II) CH4> H2> O2 -
(I) O2 < He < H2 < CO2
(II) H2> O2 > CH4 -
(I) O2 < He < O2 < CO2
(II) CH4 > O2 > H2 -
(I) H2 > O2 <He < CO2
(II) O2 > CH4 > H2
C.
(I) O2 < He < O2 < CO2
(II) CH4 > O2 > H2
From experimental values of a and b, sequence of Van der Waals constant (b) is
|
Gas |
H2 |
He |
O2 |
CO2 |
|
Value of b |
0.0273 |
0.0318 |
0.0273 |
0.0427 |
Hence correct order is
H2 < He < O2 < CO2
And sequence of van der Waals constant (a) is
|
Gas |
CH4 |
O2 |
H2 |
|
Value of a |
2.25 |
1.36 |
0.244 |
Hence, correct order is
(II) CH4 >O2> H2
