Extraction of Zinc

Q. Which of the zinc ore has common name 'zinc blende'?

1. Zinc chloride
2. Zinc sulphide
3. Zinc carbonate
4. Zinc oxide

Q.

Which of the following is not an ore of Zinc?

1. Smithsonite

2. Zinc blende

3. Rutile

4. Wurtzite

Q.

Which of the following is not related to the metallurgy of Zinc?

1. Calamine

2. Carbon reduction

3. Argentite

4. Sphalerite

Q. The bauxite ore of aluminium is concentrated by froth flotation method

1. True
2. False

Q. Extraction of zinc from zinc blende is achieved by:

1. electrolytic reduction

2. roasting followed by reduction with carbon

3. roasting followed by reduction with another metal

4. roasting followed by self-reduction

Q.

Zinc Blend is also known as Spalherite – True or False?

1. True

2. False

Q.

In the electrolytic refining process of Zinc, it is given that the crude metal is made anode while the electrolyte is used is $H_{2}S{O}_4$ (dilute) + $ZnS{O}_4$ . The cathode should be:

1. Pure Zinc

2. Zn-Hg Amalgam

3. Aluminum

4. All of the above

Q. Froth flotation $\to$Roasting$\to$Reduction$\to$Electrolysis
The above processes are used in the extraction of:

1. Cu from $CuFe{S}_2$
2. Zn from $ZnS$
3. Fe from $F{e}_2{O}_3$
4. Al from $A{l}_2{O}_3.2H_{2}O$

Q.

While ZnS is roasted, the temperature is consistently maintained above
${860}^{0}C$ while the influx of air is controlled – True or False?

1. True

2. False

Q.

In a sad twist you inherit “only” a copper mine while your siblings inherit gold and diamond mines. On inspection you come to know that your copper mine is fully equipped to extract the metal from the ore and also that it consists only of Chalcopyrite. Finely powdered, pulverized ore is ready to be processed. What would be your next step?

1. Concentration using froth floatation

2. Smelting

3. Refining

4. Roasting