Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
1. Distillation
2. Zone refining
3. Electrolysis
4. Chromatography
The correct statement among the following is:
1. | Blister copper has a blistered appearance due to the evolution of CO2. |
2. | Vapour phase refining is carried out for nickel by the Van Arkel method. |
3. | Pig iron can be moulded into a variety of shapes. |
4. | Wrought iron is impure iron with 4 % carbon. |
Match the elements in Column I with methods of purification in Column II.
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 |
Options: | (a) | (b) | (c) | (d) |
1. | (iv) | (iii) | (i) | (ii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (ii) | (i) | (iv) | (iii) |
4. | (iii) | (iv) | (i) | (ii) |
Match items of Column I with the items of Column II and assign the correct code.
Column I | Column II |
A) Cyanide process | 1) Ultra pure Ge |
B) Froth floatation Process |
2) Dressing of ZnS |
C) Electrolytic | 3) Extraction of Al Reduction |
D) Zone refining | 4) Extracting of Au |
A | B | C | D | |
1. | 2 | 3 | 1 | 4 |
2. | 1 | 2 | 3 | 4 |
3. | 3 | 4 | 2 | 1 |
4. | 4 | 2 | 3 | 1 |
A pair of metals that can be purified by van Arkel method is:
1. Zr and Ti
2. Ag and Au
3. Ni and Fe
4. Ga and In
The method of zone refining of metals is based on the principle of:
1. | Greater mobility of the pure metal than that of the impurity |
2. | Higher melting point of the impurity than that of the pure metal |
3. | Greater noble character of the solid metal than that of the impurity |
4. | Greater solubility of the impurity in the molten state than in the solid |