High purity copper metal is obtained by:

1. Carbon reduction

2. Hydrogen reduction

3. Electrolytic reduction

4. Thermite process

Purest form of iron is:

1. cast iron

2. hard steel

3. stainless steel

4. wrought iron

Corundum is:

1. SrO₂

2. Al₂O₃

3. CaCl₂

4. Cu₂Cl₂

Sulphide ores are common for the metals:

1. Ag, Cu and Pb

2. Ag, Cu and Sn

3. Ag, Mg and Pb

4. Al, Cu and Pb

Which element occurs freely in nature?

1. Iodine

2. Sulphur

3. Phosphorus

4. Magnesium

Silver obtained by argentiferrous lead is purified by:

1. distillation

2. froth floatation

3. cupellation

4. reacting with KCN

Chloride ore among the following is:

1. malachite

2. magnesite

3. magnetite

4. Karnalite

Cupellation process is used in the metallurgy of:

1. copper

2. silver

3. lead

4. iron

Wolframite ore contains:

1. Zn

2. W

3. Hf

4. Au

Roasting is generally carried out in case of :

1. Oxide ores

2. Sulphide ores

3. Silicate ores

4. Carbonate ores