The cooling of molten urea by air in the tower is called______________________?

Related Mcqs:

1. Molten NaCl conducts electricity due to the presence of_______________?

   A. Free electrons
   B. Free molecules
   C. Free ions
   D. Atoms of Na and Cl

2. Addition of urea to the soil is ____________ reaction?

   A. endothermic
   B. exothermic
   C. both a and b
   D. no heat energy is involved

3. Which one of the following set of raw material is most suitable for manufacture of urea ?

   A. CH4 N2 and CO2
   B. H2 N2 and CO
   C. H2 CO2 and H2O
   D. H2O N2 and H2

4. The percentage of nitrogen in urea is________________?

   A. 36%
   B. 46%
   C. 56%
   D. 66%

5. Which one of the following statement is correct for urea ?

   A. it is a synthetic fertilizer
   B. it is a natural fertilizer
   C. it provides micronutrients to the plants
   D. it is an inorganic water soluble compound

6. The gas used in manufacturing of urea fertilizer__________________?

   A. C2H6
   B. C2H4
   C. C2H2
   D. CH4

7. Urea as a fertilizer contains:____________?

   A. 57% N
   B. 73% N
   C. 46% N
   D. 53% N

   Submitted by: TAHREEM RAJPOOT

8. Separation of a solid from its hot saturated solution by cooling is called__________________?

   A. vapourization
   B. solvent extraction
   C. filtration
   D. crystallization

9. Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter?

   A. PdCl2
   B. Cu2Cl2
   C. CuCl2
   D. PbCl2

10. Which of the following noble gases is abundant in air?

    A. Neon
    B. Helium
    C. Argon
    D. Methane

    Submitted by: Malik Asghar Hussain