States of Matte...

Direction (Q. Nos. 1-11) This section contains 11 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. In van der Waals’ equation of state for non-ideal gas, that includes correction for intermolecular forces is

[ITT JEE 1998, 2009]

The value of van der Waals’ constant a for various gases are given

Q. The order of liquefaction of these gases is

[IITJEE 1989]

A gas will approach ideal behavious at 

[IIT JEE 1999]

The compressibility of a gas is less than unity for a gas at STP. Therefore,

[IIT JEE 2000]

Positive deviation from ideal behaviour takes place because of

[IIT JEE 2003]

Van der Waals ’ equation for one mole of CO₂ gas at low pressure will be

[JEE Advanced 2014]

If V is the volume of one molecule of a gas under given conditions, then van der Waals ’ constant b (also called excluded volume or effective volume) is

Fraction of the effective volume occupied by molecules in 1 mole of a gas at STP (diameter of the molecule is 2 x 10^-10m) is

The compressibility factors for real gases at low pressure , high pressure and that of gases of low molar masses are Z₁ Z₂ and Z₃. These are

[AIEEE 2012 , JEE Main 2014]

a and b are van der Waals’ constants for gases. Chlorine is more easily liquefied than ethane because

[AIEEE 2011]

For one mole of a van der Waals’ gas when b = 0 and T = 300 K, the pV versus 1/V plot is shown in figure. The value of the van der Waals' constant a (atm L² mol^-2) is

Direction (Q. Nos. 12) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. Match the parameters given in Column I with the units given in Column II and select the correct answer from the codes given below.

Direction (Q. Nos. 13 and 14) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.

Q. 

Statement I : At constant temperature, pV versus p isotherm for real gases is not a straight line.

Statement II : At high pressure, all gases have Z > 1, but at intermediate pressure, most gases have Z < 1.

Statement I : In van der Waals’ equation, pressure correction is due to force of attraction between molecules.

Statement II : Rate of change of momentum is equal to force.