Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of_____________________?

Related Mcqs:

1. 20% oleum means that in 100 kg oleum, there are 20 kg of_____________________?

   A. SO3 and 80kg of H2SO4
   B. H2SO4 and 80kg of SO3
   C. SO3 for each 100 kg of H2SO4
   D. None of these

2. Oleum produces fumes of_____________________?

   A. SO2
   B. H2SO4
   C. SO3
   D. SO2 + H2SO4

3. Chemical formula of oleum is_________________?

   A. H2SO3
   B. H2SO4
   C. H2S2O7
   D. H2SO7

4. Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at _____________ °C ?

   A. 15-30
   B. 90-100
   C. 250-300
   D. < 0

5. More than 100 percent of _________________ is present in oleum?

   A. SO3
   B. H2SO4
   C. H2SO3
   D. SO2

6. 10% oleum comprises of 10% free_________________?

   A. SO2
   B. H2SO3
   C. SO3
   D. H2SO4

7. Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like_________________?

   A. High cost
   B. Fragile nature
   C. Easy poisoning tendency
   D. All A, B. and C.

8. One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to_________________?

   A. Adjust the pH of the syrup
   B. Remove the coloring matter from the syrup
   C. Reduce the viscosity of the syrup
   D. Improve the rate of crystallisation of sugar

9. Flux addition during smelting of ore is done to___________________?

   A. Remove impurities/gangue
   B. Enhance rate of reaction
   C. Accelerate reduction of ore
   D. Separate slag from metal

10. Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?

    A. CaO
    B. MnO2
    C. ZnO
    D. FeS