Roasting of metallurgical ores is done mainly to ___________________?

Related Mcqs:

1. Concentration of sulphide ores is done usually by____________________?

   A. Roasting
   B. Smelting
   C. Froth floatation
   D. Electromagnetic separation

2. ______________ is an ore concentrating metallurgical process involving a chemical change?

   A. Electromagnetic separation
   B. Froth floatation
   C. Roasting
   D. None of these

3. Coloured glass is obtained by mixing of colored salts. Addition of ___________________ oxide is done to impart greenish blue color to the glass?

   A. Chromium
   B. Arsenic
   C. Copper
   D. Manganese

4. Acrylonitrile is mainly used in the _____________ industry?

   A. Polymer
   B. Printing
   C. Dyeing
   D. Photographic

5. Carbon disulphide is mainly used in the production of______________________?

   A. Viscose rayon
   B. Corundum
   C. Plasticiser for unsaturated polyester
   D. Paints

6. Phenol is mainly used____________________?

   A. To produce benzene
   B. To produce phenol formaldehyde
   C. To produce polyester resin
   D. As a plasticiser for unsaturated polyester

7. Hydrazine (N2H4) is used mainly as a/an__________________?

   A. Explosive
   B. Rocket fuel
   C. Detergents additive
   D. None of these

8. Portland cement consists mainly of__________________?

   A. CaO & SiO2
   B. SiO2 & Al2O3
   C. CaO & Al2O3
   D. CaO & Fe2O3

9. Producer gas consists mainly of________________________?

   A. CO, CO2 N2, H2
   B. CO, H2
   C. H2, CH4
   D. C2H2, CO2, H2

10. Cement mainly contains_________________?

    A. CaO, SiO2, Al2O3
    B. MgO, SiO2, K2O
    C. Al2O3, MgO, Fe2O3
    D. CaO, MgO, K2O