Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases	Critical temperature in Kelvin
H2	33.2
He	5.3
O2	154.3
N2	126

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first

(i) H₂, He, O₂, N₂ 

(ii) He, O₂,  H₂, N₂

(iii) N₂, O₂, He, H₂ 

(iv) O₂, N₂, H₂, He 

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–

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Which of the following is a carbonate ore ?