For real gases the relation between p, V and T is given by van der Waals equation: 

where 'a' and are van der Waals constants, 'nb' is approximately equal to the total volume of the molecules of a gas. 

'a' is the measure of magnitude of intermolecular attraction.

 I. Arrange the following gases in the increasing order of 'b'. Give reason. O₂, CO₂,  H₂, He

II. Arrange the following gases in the decreasing order of magnitude of 'a'. Give reason. CH₄, O₂, H₂. 

The standard enthalpy of combustion at 25°C of hydrogen, cyclohexene (C₆H₁₀) and cyclohexane (C₆H₁₂) are –241, –3800 and –3920 kJ mol–1 respectively. Calculate the standard enthalpy of hydrogenation of cyclohexene.

HCP crystal is made of A ions and B ions are arranged in 2/3rd of octahedral voids. The simplest formula of compound is :-

Enthalpy of neutralisation of CH₃COOH by NaOH is – 50.6 kJ/mol and the heat of neutralisation of a strong acid with NaOH is – 55.9 kJ/mol. The value of ΔH for the ionisation of CH₃COOH is :

Kindly Consider following table–

<!-- [if !supportLists]-->(i)    <!--[endif]-->The correct match is–

 

 

  

Which of the following is a carbonate ore ?