Q. No.Which of the following is an incorrect match?
1. Kaolinite - Al2(OH)4Si2O5
2. Cuprite - Cu2O
3. Siderite - FeCO3
4. Calamine - ZnSO4
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
Match the items in Column I with the items in Column II and assign the correct code.
| Column I | Column II |
| A. Pendulum | 1. Chrome steel |
| B. Malachite | 2. Nickel Steel |
| C. Calamine | 3. Na3AlF6 |
| D. Cryolite | 4. CuCO3. Cu (OH)2 |
| 5. ZnCO3 |
Codes
| A | B | C | D | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 4 | 5 | 3 |
| 3. | 2 | 3 | 4 | 5 |
| 4. | 4 | 5 | 3 | 2 |
| List- I (ores) | List- II (Composition) |
| (a) Haematite | (i) \(Fe_3O_4\) |
| (b) Magnetite | (ii) \(ZnCO_3\) |
| (c) Calamine | (iii) \(Fe_2O_3\) |
| (d) Kaolinite | (iv) \([Al_2(OH)_4Si_2O_5]\) |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iii) | (i) | (ii) | (iv) |
| 4. | (iii) | (i) | (iv) | (ii) |
The fundamental principle of froth flotation process is:
| 1. | Impurities and metal ore have different wetting properties. |
| 2. | Impurities and metal ore have different solubility. |
| 3. | Impurities and metal ore have different diversity. |
| 4. | Impurities and metal ore have different compressive powers. |
NaCN is a depressant that is used:
| 1. | To Separate PbS from ZnS by forming a complex with PbS. |
| 2. | To Separate PbS from ZnS by forming a complex with ZnS. |
| 3. | To Form froth. |
| 4. | As a collector. |
The common impurities present in bauxite are:
a.
b.
c.
d.
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
The extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by:
1. Liquation
2. Distillation
3. Zone refining
4. Displacement with Zn
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