___________________ iron is the purest form of iron?

Related Mcqs:

1. Which is the main reducing agent during production of iron from iron ore in a blast furnace ?

   A. C
   B. CO
   C. CO2
   D. H2

2. Pig iron is produced by blast furnaces in India using mostly the iron ore named _______________?

   A. Hematite
   B. Magnetite
   C. Siderite
   D. Chalcopyrite

3. ______________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace?

   A. Bauxite
   B. Limestone
   C. Quartz
   D. Manganese

4. Which of the following is an ore of iron ?

   A. Galena
   B. Chalcopyrite
   C. Hematite
   D. Bauxite

5. Iron ore hematite is concentrated using ____________________?

   A. Electromagnetic separation mainly
   B. Gravity separation
   C. Froth floatation
   D. Roasting

6. ____________ are used as corrosion inhibitor for iron & steel in aqueous solutions ?

   A. Phosphates
   B. Chromates
   C. Sulphates
   D. Bi-carbonates

7. Raw materials used for producing ________________ cement does not contain iron oxide?

   A. Waterproof
   B. Slag
   C. White
   D. Pozzolan

8. DDT should not be allowed to come in contact with iron (during its manufacture) to _______________?

   A. Avoid its decomposition
   B. Prevent sulphonation of the monochlorobenzene by the acid catalyst
   C. Achieve non-hygroscopic property
   D. None of these

9. Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is __________________?

   A. A slow reaction
   B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
   C. Still in development stage (by employing fluidised bed technique)
   D. All A , B. and C

10. Commercial production of soda ash by Solvay process requires limestone, ___________________ as raw materials?

    A. Coke and sand
    B. Brine and coal
    C. Coke and caustic soda
    D. None of these