Wolframite ore contains:
1. Zn
2. W
3. Hf
4. Au
The process in which ore is heated in limited supply of air below its melting point is known as:
1. Roasting
2. Calcination
3. Reduction
4. Distillation
Iron is made inactive or passive by:
1. H3PO4
2. conc. HNO3
3. conc. H2SO4
4. dil. HNO3
The inner lining of a blast furnace is made up of:
1. graphite bricks
2. silica bricks
3. fire clay bricks
4. basic bricks
Roasting is generally carried out in case of :
1. Oxide ores
2. Sulphide ores
3. Silicate ores
4. Carbonate ores
Plumbo-solvency refers to:
1. oxidation of lead to lead oxide
2. oxidation of lead to red lead
3. dissolution of lead in water containing air
4. making lead wires by forcing heated metal through a die
Rutile is an ore of:
1. Ti
2. Zr
3. Mn
4. V
Which is not a mineral?
1. Mica
2. Peat
3. Quartz
4. Felspar
Alloy is an example of:
1. gel
2. aerosol
3. solid sol
4. emulsion