Which process is not used in purification of bauxite?
1. Hall's method
2. Baeyer's method
3. Serpek's method
4. Frankland's method
Chloride ore among the following is:
1. malachite
2. magnesite
3. magnetite
4. Karnalite
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