Extraction of Moderately Reactive Metals

Q. Which of the following metals are extracted by reducing their metal oxides using carbon?

1. Calcium
2. Iron
3. Magnesium
4. Lead

Q. Explain the process by which the metal is obtained from its molten chloride

Q.

Question 65
Two ores A and B were taken. On heating, ore A gives ${\text{CO}}_2$ whereas, ore B gives ${\text{SO}}_2$. What steps will you take to convert them into metals ?

Q. Granules of zinc react with dilute hydrochloric acid to liberate a gas that burns with the pop sound. The gas is:

1. oxygen
2. hydrogen
3. carbon dioxide
4. carbon monoxide

Q.

What is the state of CuSO4 and FeSO4 ?

Q. Which of the following processes are widely used in the extraction of moderately reactive metals from their sulphide ore?

1. Electrolytic reduction
2. Heating with carbon
3. Roasting
4. Calcination

Q. Write a short note on the concentration of ore.

Q.

In a mining field, miners found an ore called fool's gold whose chemical formula is ${\text{FeS}}_2$. Which method has to be carried out to convert concentrated ore to its oxide?

1. Calcination

2. Roasting

3. Froth floatation

4. Magnetic separation

Q.

name a white insoluble oxide that disolves when fused with caustic soda or caustic potash

Q. Match the following concentration methods with the principle behind them.

1. Specific gravity
2. Magnetic property
3. Differential wetting property

Q. Statement 1: The sulphide ore is converted into its oxides in the absence of air.
Statement 2: The carbonate ores is converted into oxides in the presence of excess air.

1. Both statements are false.
2. Both statements are true.
3. Statement 1 is true and statement 2 is false.
4. Statement 1 is false and statement 2 is true.

Q. Statement 1: The sulphide ore is converted into its oxides in the absence of air.
Statement 2: The carbonate ores is converted into oxides in the presence of excess air.

1. Both statements are false.
2. Both statements are true.
3. Statement 1 is true and statement 2 is false.
4. Statement 1 is false and statement 2 is true.

Q.

Which one of the following processes makes the ore porous?

1. Froth floatation

2. Calcination

3. Roasting

4. Gravity separation

Q. Aluminium is more reactive than magnesium.

1. True
2. False

Q. Zinc carbonate ore is converted into zinc oxide ore by the process called:

1. calcination
2. electrolysis
3. anodising
4. roasting

Q.

In froth floatation process, ______ is wetted by the oil and _____ is wetted by the water.

1. mineral, ore

2. ore, gangue

3. gangue, ore

4. mineral, gangue

Q. The reducing agent used in the reduction of zinc oxide to zinc is:

1. Carbon monoxide
2. Coke
3. Pure zinc
4. Carbon dioxide

Q. Statement 1: The sulphide ore is converted into its oxides in the absence of air.
Statement 2: The carbonate ores is converted into oxides in the presence of excess air.

1. Both statements are false.
2. Both statements are true.
3. Statement 1 is true and statement 2 is false.
4. Statement 1 is false and statement 2 is true.

Q. converts sulphides to oxides. converts carbonates to oxides.

1. Calcination
2. Heating
3. Roasting
4. Refining

Q. ______ is a process of heating the concentrated ore at the temperature below its melting point in the presence of air.

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

Q. Name the process of heating of an ore in the absence of air below its melting point.

1. Roasting
2. Oxidation
3. Auto-reduction
4. Calcination

Q. Carbon is used as the reducing agent during extraction of some metals from their ores.

1. True
2. False