____________ catalyst is used in the production of urea from CO2 and NH3?

Related Mcqs:

1. An increase in the NH3/CO2 ratio in urea manufacture results in__________________?

   A. Increased degree of conversion of CO2 to urea
   B. Decreased degree of conversion of NH3 to urea
   C. Decreased yield of urea
   D. Decreased specific volume of molten mass

2. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ______________ of the catalyst ?

   A. Stabilisation
   B. Increasing the effectiveness
   C. Improving the strength & heat resistance
   D. All A, B & C

3. Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an ______________ reaction?

   A. Catalytic
   B. Exothermic
   C. Endothermic
   D. Reversible

4. Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in__________________?

   A. Low bulk density product
   B. Biuret formation
   C. Non-spherical prills
   D. Substantially wet non-flowing and sticky product

5. 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

6. Promoter used in NH3 synthesis catalyst is__________________?

   A. K2O
   B. SiO3
   C. V2O5
   D. U2O3

7. Catalyst used in the manufacture of NH3 by Haber’s process is finely divided________________?

   A. Nickel
   B. Iron
   C. Vanadium pentoxide
   D. Alumina

8. Raw materials for urea production are _________________?

   A. CO2 and N2
   B. CO2, H2 and N2
   C. NH3 and CO
   D. HNO3 and CaCO3

9. Catalyst used in Haber’s process for ammonia production is_________________?

   A. Reduced iron oxide
   B. Nickel
   C. Vanadium pentoxide
   D. Silica gel

10. Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of ____________ this is normally not done?

    A. Increased biuret formation
    B. High corrosion rate
    C. Increased cost of equipment
    D. All A., B. & C.