Catalytic ammonia synthesis reaction as in Haber’s process is_________________?

Related Mcqs:

1. Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?

   A. Al2O3
   B. Cr2O3
   C. K2O
   D. MnO

2. In ammonia synthesis (N2 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at________________?

   A. Low pressure
   B. High pressure
   C. Very high temperature
   D. Atmospheric pressure; as the pressure has no effect on conversion

3. Ammonia synthesis reaction is______________________?

   A. Exothermic
   B. Endothermic
   C. Autocatalytic
   D. None of these

4. Steam reforming of naphtha produces ammonia synthesis gas. This is a/an ____________ process?

   A. Autocatalytic
   B. Endothermic
   C. Exothermic
   D. Non-catalytic

5. Multistage operation (as in the case of catalytic oxidation of SO2) is not carried out for NH3 synthesis, because of____________________?

   A. Comparatively higher pressure drop
   B. High cost of the high pressure vessel used for the reactor
   C. Higher pumping cost
   D. Chances of entrainment and disturbance of catalyst bed

6. During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about ______________ percent?

   A. 38
   B. 68
   C. 82
   D. 98

7. Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis ?

   A. H2 separation from coke oven gas
   B. Steam reforming of naphtha
   C. Cracking of natural gas
   D. Electrolysis of water

8. Iron is not used alone as a catalyst in ammonia synthesis, because___________________?

   A. Its activity declines rapidly, if heated to above 520°C
   B. It decomposes ammonia
   C. It gets oxidised above 500°C
   D. None of these

9. Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature___________________?

   A. Rate of reaction is very low
   B. Very high pressure is required resulting in costly pressure vessel
   C. Space velocity of gas is very low resulting in decreased conversion
   D. None of these

10. Low grade coal is ______________ to produce ammonia synthesis gas?

    A. Hydrogenated
    B. Liquefied
    C. Gasified
    D. Dehydrogenated