The iron ore that is used to line the reverberatory furnace to prepare the purest form of iron is-

1. Haematite 

2. FeO

3. \(Fe_{3}O_{4}\)

4. None of the above.

At a temperature above 1073 K, coke can be used to reduce FeO to Fe. It can be best explained by:

1. Ellingham diagram.

2. Orgel diagram.

3. Tunabo-Sugano diagram.

4. Born-Haber cycle.

The correct match among the following is:

What method is used to extract zinc from zinc blende?

1. Electrolytic reduction

2. Roasting followed by reduction with carbon

3. Roasting followed by reduction with another metal

4. Roasting followed by self-reduction

What happens in the extraction of chlorine by electrolysis of brine?

1. Oxidation of $C{l}^{-}$ ion to chlorine gas occurs.

2. Reduction of $C{l}^{-}$ ion to chlorine gas occurs.

3. For overall reaction $∆\mathrm{G}°$has negative value.

4. A displacement reaction takes place.

Which are the most abundant elements present inside the earth's crust?

1. Al, and Fe 

2. Al, and Cu

3. Fe, and Cu

4. Cu, and Ag

Which of the following metals can be purified by electrolytic refining?

1. Cu, and Zn     

2. Ge, and Si     

3. Zr, and Ti     

4. Zn, and Hg

In the extraction of aluminium by the Hall-Heroult process, purified ${\mathrm{Al}}_2{\mathrm{O}}_3$ is mixed with ${\mathrm{CaF}}_2$ to:

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

From the following, the correct statements about the role of substances added in the froth flotation process are:

1. a and b
2. b and c
3. c and d
4. a and c

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