Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ?

Related Mcqs:

1. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant ‘K’ is____________________?

   A. 10 atm-1
   B. 105 atm-1
   C. 10 (dimensionless)
   D. 105 (dimensionless)

2. Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?

   A. 1
   B. 2
   C. 3
   D. 4

3. If we increase the pressure on a substance (which is at its triple point), then the triple point __________________?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. May increase or decrease; depends on the substance

4. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is__________________?

   A. -2 RT ln 0.5
   B. -RT ln 0.5
   C. 0.5 RT
   D. 2 RT

5. The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

   A. 0.07
   B. 0.09
   C. 0.11
   D. 0.13

6. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?

   A. μ° + RT ln f
   B. μ°+ R ln f
   C. μ° + T ln f
   D. μ° + R/T ln f

7. Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?

   A. -94 kcal
   B. +94 kcal
   C. > 94 kcal
   D. < -94 kcal

8. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

   A. -109.5
   B. +109.5
   C. +180
   D. +100

9. Degrees of freedom at triple point will be______________?

   A. 0
   B. 1
   C. 2
   D. 3

10. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?

    A. More
    B. Less
    C. Same
    D. More or less; depending on the system