Low purity oxygen is used for____________________?

Related Mcqs:

1. Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about _____________ °C ?

   A. -53
   B. -103
   C. -183
   D. -196

2. 99.5% purity oxygen is used in_____________________?

   A. Cutting and welding by oxy-acetylene flame
   B. Hospitals for medicinal purposes
   C. Gas masks and artificial breathing apparatus
   D. All A, B, and C.

3. Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about ______________ °C ?

   A. -83
   B. -183
   C. -196
   D. -218

4. High purity nitrogen is used in__________________?

   A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
   B. Fire fighting purposes
   C. Both A. & B.
   D. Neither A. nor (B)

5. Hydrocyanic acid (HCN) is used as an insecticide for____________________?

   A. Controlling timber degradation by ants
   B. Controlling poultry lice
   C. Potato beetle
   D. Citrus fruits

6. Oxygen is produced by fractionation of air using _____________ process?

   A. Linde’s
   B. Claude’s
   C. Either A. or B.
   D. None of these

7. Use of water having dissolved oxygen in boilers promotes___________________?

   A. Corrosion
   B. Sequestration
   C. Scale formation
   D. None of these

8. Low temperature carbonisation of coal takes place at _______________ °C ?

   A. 300
   B. 1100
   C. 700
   D. 900

9. Superior quality laboratory apparatus is made of the _____________ glass having low thermal co-efficient of expansion & high chemical resistance?

   A. Flint
   B. Soda
   C. Pyrex
   D. Potash

10. The purpose of adding Na2CO3 to water of low alkalinity is to__________________?

    A. Permit the use of alum as a coagulant
    B. Increase the softening capacity of zeolite
    C. Facilitate easy regeneration of zeolite
    D. All A , B. and C.