The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by_________________?

Related Mcqs:

1. Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used_______________________?

   A. As a lubricant
   B. As a rust preventive
   C. In hard water for cleaning of cloth
   D. As a foam depressant in distillation column

2. Sand and ______________ is fused at 1300°C, to produce sodium silicate ?

   A. Limestone
   B. Soda ash
   C. Coke
   D. Sodium sulphate

3. Fusion of bauxite and ________________ produces high alumina cement?

   A. Alum
   B. Limestone
   C. Coke
   D. Quartz

4. Fusion of limestone and ______________ produces high alumina cement?

   A. Sand
   B. Bauxite
   C. Quicklime
   D. Calcite

5. Metallic soap is ________________ salt of fatty acids ?

   A. Sodium
   B. Potassium
   C. Both sodium & potassium
   D. Aluminium or calcium

6. Pure rectified spirit contains about _________________ percent alcohol?

   A. 45
   B. 70
   C. 95
   D. 99.5

7. The amount of benzene present in pure Benzol is about _______________ percent ?

   A. 30
   B. 50
   C. 70
   D. 90

8. Permanent hardness of water can be removed by_________________?

   A. Addition of soda ash to it
   B. Treating it with zeolites
   C. Passing it through sodium hexametaphosphate
   D. All A , B, and C.

9. Salt cake is chemically represented by_________________?

   A. Na2SO4
   B. CaSO4. ½H2O
   C. MgSO4
   D. BaSO4

10. ______________ is obtained as a by-product in the manufacture of sodium hydroxide using brine ?

    A. Chlorine
    B. Ammonium chloride
    C. Sodium carbonate
    D. Sodium bi-carbonate