Extraction of Zinc

Q.

E. Tick the most appropriate answer:

4. When red lead oxide is heated strongly, it forms lead monoxide and oxygen gas. The colour of lead monoxide is

1. yellow

2. white

3. red

4. blue

Q.

Steam is passed over hot coke at 1000${}^{\mathrm{o}}\mathrm{C}$ in a converter to produce Hydrogen gas$\left({\mathrm{H}}_2\right)$.

1. True
2. False

Q.

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

Q.

What do you observe when:

When lead monoxide is heated in a charcoal.

Q.

For each substance listed below, explain its significance in extraction of aluminium.

Bauxite

Q.

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

1. True

2. False

Q.

Question 55
Give the reaction involved during extraction of zinc from its ore by

(a) roasting of zinc ore.
(b) calcination of zinc ore.

Q. Out of the following reduction process-

1. $All$
2. $A,B,D$
3. $A,B,C$
4. $B,D$

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. False

2. True

Q.

The soft metal which combines with chlorine to make table salt is ______.

1. sulphur
2. sodium
3. silicon
4. potassium

Q.

Which of the following is not an ore of Zinc?

1. Wurtzite

2. Smithsonite

3. Zinc blende

4. Rutile

Q.

The smelting of Zinc Oxide (obtained from roasted ZnS) happens __ the boiling point of Zinc metal

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

1. electrolytic reduction

2. roasting followed by self-reduction

3. roasting followed by reduction with carbon

4. roasting followed by reduction with another metal