Verified Solution • 2025–26 Session moderate

QAIPM-2012-Ch-1643: NEET 2012 Chemistry - Class 11 AIPM-2012-Ch-1643 Solution: For real gases van der Waals equation is written as \((p+…

For real gases van der Waals equation is written as (p+an2V2)(V−nb)=nRT(p+\frac{an^2}{V^2})(V-nb)=nRT where a and b are van der Waals constants. Two sets of gases are (I) O2CO2H2O_2 CO_2 H_2 and He (II) CH4O2CH_4 O_2 and H2H_2 The gases given in set-I in 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 < H2H_2 < CO2CO_2 < O2O_2 (II) CH4CH_4 > H2H_2 > O2O_2 (I) O2O_2 < He < H2H_2 < CO2CO_2 (II) H2H_2 > O2O_2 > CH4CH_4 (I) H2H_2 < He < O2O_2 < CO2CO_2 (II) CH4CH_4 > O2O_2 > H2H_2 (I) H2H_2 < O2O_2 < He < CO2CO_2 (II) O2O_2 > CH4CH_4 > H2H_2

Multiple Choice Options

  • A (I) He < H 2 < CO 2 < O 2    (II) CH 4 > H 2 > O 2
  • B (I) O 2 < He < H 2 < CO 2   (II) H 2 > O 2 > CH 4
  • C (I) H 2 < He < O 2 < CO 2    (II) CH 4 > O 2 > H 2
  • D (I) H 2 < O 2 < He < CO 2    (II) O 2 > CH 4 > H 2

Step-by-Step Verified Solution

Van der Waal gas constant ' a ' represent intermolecular force of attraction of gaseous molecules and Van der Waal gas constant 'b' represent effective size of molecules . Therefore order should be (I) H 2 < He < O 2 < CO 2    (II) CH 4 > O 2 > H 2

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