High purity copper metal is obtained by:

1. Carbon reduction

2. Hydrogen reduction

3. Electrolytic reduction

4. Thermite process

Thomas slag is:

1. calcium silicate

2. calcium  phosphate

3. tricalcium phosphate and calcium silicate

4. calcium ammonium phosphate

Heating of carbonate ores to remove carbon is called as:

1. Roasting

2. Calcination

3. Smelting

4. Fluxing

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

The metal used in storage batteries is:

1. Cu

2. Sn

3. Pb

4. Ni

Silver obtained by argentiferrous lead is purified by:

1. distillation

2. froth floatation

3. cupellation

4. reacting with KCN

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