Chalcogens are:
1. hydrocarbons
2. ore forming elements
3. oxide forming elements
4. those having ability to catenate
Which pair of elements can form alloy?
1. Zn and Cu
2. Fe and Hg
3. Fe and C
4. C and Pt
Cupellation process is used in the metallurgy of:
1. copper
2. silver
3. lead
4. iron
Liquation is used to purify:
1. Pb
2. Sn
3. Bi
4. All
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