Roasting

Q. __________ is the process of heating concentrated ore in the absence of air.

1. Roasting
2. Smelting
3. Calcination
4. Electrolysis

Q.

Roasting is defined as:

1. Heating of sulphide ores in presence of air.

2. Heating of sulphide ores in absence of air.

3. Heating of carbonate ores in presence of air.

4. Heating of carbonate ores in absence of air.

Q.

The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

1. Calcination

2. Roasting

3. Boiling

4. Decantation

Q.

Name the most important ore of:
(i) Al
(ii) Zn [2 MARKS]

Q.

In the process of extraction of metals, roasting could be utilised for:

1. Metal sulphides

2. Metal fluorides

3. Metal oxides

4. Metal carbides

Q.

Why is sulphide ore roasted befre reduction.

Q. Name a importantore of Iron and its chemical composition .write the reactions occurrinng inside the blast furnace in the extraction of iron.