A. Remove impurities/gangue
B. Enhance rate of reaction
C. Accelerate reduction of ore
D. Separate slag from metal
Related Mcqs:
- _______________ is used as a flux in the smelting of copper ore like chalcopyrite ?
A. Coke breeze
B. Lime powder
C. Silica/quartz
D. Dolomite - Ore concentration by froth floatation utilises the ______________ of ore particles ?
A. Density difference
B. Wetting characteristics
C. Terminal velocities
D. None of these - ______________ 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 - 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 - 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 - Sulphur addition in soap is done to _____________________?
A. Improve the soap texture
B. Cure pimples & dandruff
C. Fasten lather formation
D. Increase its cleansing action - 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 - Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of_____________________?
A. Nitric acid
B. Hydrochloric acid
C. Methyl alcohol
D. Formic acid - Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?
A. CaO
B. MnO2
C. ZnO
D. FeS - The function of gypsum addition during cement making is to_________________?
A. Increase the density of cement
B. Decrease the cement setting rate
C. Both A. and B.
D. Neither A. nor B.
