In the froth flotation process, how can zinc sulphide and lead sulphide be separated?

a. Using collectors.

b. Adjusting the proportion of oil to water.

c. Using depressants.                                          

d. Using froth stabilizers.

Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The common impurities present in bauxite are:

a. $\mathrm{CuO}$                    

b. $\mathrm{ZnO}$                

c. ${\mathrm{Fe}}_2{\mathrm{O}}_3$                

d. ${\mathrm{SiO}}_2$

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

From the following, the ores that are concentrated by froth flotation are:

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

Reactions among the following that occur during calcination are:

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c

Which of the following ores can be reduced by carbon?

a. Haematite           

b. Zincite          

c. Iron pyrites         

d. Sphalerite

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

The main reactions that occur in the blast furnace during iron extraction from hematite are:

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

The following method of purification, where metal is converted to its volatile compound that gives pure metal is upon the decomposition :

a.  Heating with a stream of carbon monoxide.

b.  Heating with iodine.

c.  Liquation

d.  Distillation

Choose the correct option :

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Which of the following statements are correct?

a.  A depressant prevents certain types of particles to come to the froth.

b.  Copper matte contains ${\mathrm{Cu}}_2\mathrm{S}$ and $\mathrm{ZnS}$.

c.  The solidified copper obtained from the reverberatory furnace has a blistered appearance due to the evolution of ${\mathrm{SO}}_2$ during the extraction.

d.  Zinc can be extracted by self-reduction.

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

In the extraction of chlorine from brine ............

a. $∆{\mathrm{G}}^{⊝}$ for the overall reaction is negative.

b. $∆{\mathrm{G}}^{⊝}$ for the overall reaction is positive.

c. ${\mathrm{E}}^{⊝}$ for the overall reaction has a negative value.

d. ${\mathrm{E}}^{⊝}$ for the overall reaction has a positive value.

Choose the correct option

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Match the items in Column I with the items in Column II and assign the correct code.

Codes