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:
Column I | Column II |
(a) Boron | (i) Van Arkel method |
(b) Tin | (ii) Mond's process |
(c) Zirconium | (iii) Liquation |
(d) Nickel | (iv) Zone refining |
(a) | (b) | (c) | (d) | |
1. | (iv) | (iii) | (i) | (ii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (ii) | (i) | (iv) | (iii) |
4. | (iii) | (iv) | (i) | (ii) |
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 ion to chlorine gas occurs.
2. Reduction of ion to chlorine gas occurs.
3. For overall reaction 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 is mixed with to:
a. | Lower the melting point of |
b. | Increase the conductivity of the molten mixture. |
c. | Reduce into |
d. | Act as a catalyst |
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:
a. | Collectors enhance the non-wettability of the mineral particles. |
b. | Collectors enhance the wettability of gangue particles. |
c. | By using depressants in the process, two sulphide ores can be separated. |
d. | Froth stabilisers decrease the wettability of gangue. |
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:
a. | Haematite | b. | Galena |
c. | Copper pyrites | d. | Magnetite |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d