High purity copper metal is obtained by:
1. Carbon reduction
2. Hydrogen reduction
3. Electrolytic reduction
4. Thermite process
Aluminothermic process is used for the extraction of metals, whose oxides are:
1. fusible
2. not easily reduced by carbon
3. not easily reduced by hydrogen
4. strongly basic
Purest form of iron is:
1. cast iron
2. hard steel
3. stainless steel
4. wrought iron
Thomas slag is:
1. calcium silicate
2. calcium phosphate
3. tricalcium phosphate and calcium silicate
4. calcium ammonium phosphate