Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?

Related Mcqs:

1. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is_________________?

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

2. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?

   A. 0.4
   B. 0.6
   C. 0.8
   D. 0.2

3. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

   A. Relative humidity
   B. Relative saturation
   C. Percentage saturation
   D. None of these

4. What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ?

   A. 2/3
   B. 1/3
   C. 1/2
   D. 1/3 × (298/273)

5. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?

   A. 6
   B. 8
   C. 10
   D. 12

6. A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be _____________ kgf/cm2 ?

   A. 1
   B. 2
   C. 4
   D. 8

7. Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants) ?

   A. (atm)Δx, when Δx is negative
   B. (atm)Δx, when Δx is positive
   C. Dimensionless, when Δx = 0
   D. (atm)Δx2, when Δx > 0

8. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be _____________ litres?

   A. 448
   B. 224
   C. 22.4
   D. Data insufficient; can’t be computed

9. The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?

   A. Lower than
   B. Higher than
   C. Same as
   D. Not related to

10. A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?

    A. 13728 J
    B. 19206 J
    C. 4576 J
    D. 12712 J