Q. No.The role of depressant in froth floatation process is :
| 1. | To separate two nitrite ores by selectively preventing one ore from forming froth. |
| 2. | To separate two sulphide ores by selectively preventing one ore from forming froth. |
| 3. | To separate two sulphide ores by selectively preventing both of them from forming froth. |
| 4. | To separate two magnesium ores by selectively preventing both of them from forming froth. |
The extraction of copper from pyrites is more difficult than from its oxide ores through reduction because -
1. of HCl is less than that of
2. of HNO3 is less than that of
3. of is less than that of
4. of CuSO4 is less than that of
The common elements present in the anode mud in electrolytic refining of copper are -
1. Nitrogen, magnesium, sodium
2. Silver, gold, platinum, and antimony
3. Oxygen, sulphur, lithium
4. Nitrogen, magnesium, oxygen
The role of silica in the metallurgy of copper is :
| 1. | To remove the iron oxide obtained during the process of roasting as ‘slag’. |
| 2. | To remove the sulphur oxide obtained during the process of roasting as ‘slag’. |
| 3. | To remove the nitrogen oxide obtained during the process of roasting as ‘slag’. |
| 4. | To remove the aluminium oxide obtained during the process of roasting as ‘slag’. |
The term “Chromatography” means -
1. Technique for the preparation of mixtures.
2. Technique for the separation of mixtures.
3. Technique for the separation of ore.
4. Technique for the preparation of aluminium.
Which of the following statements is true about the refining of nickel?
| 1. | Nickel is heated in the presence of NO2 to form nickel tetracarbonyl. |
| 2. | Nickel is heated in the presence of CO to form nickel tetracarbonyl. |
| 3. | Nickel is heated in the presence of CO2 to form nickel tetracarbonyl. |
| 4. | Nickel is heated in the presence of SO2 to form nickel tetracarbonyl. |
‘Cast iron’ is different from ‘Pig iron' because :
| 1. | Cast iron is obtained by melting pig iron and coke using a hot air blast. |
| 2. | Cast iron contains lower amount of carbon (3%) than pig iron. |
| 3. | Unlike pig iron, cast iron is extremely hard and brittle. |
| 4. | All of the above |
The correct statement among the following is:
| 1. | All ores are minerals, but all minerals are not necessarily ores. |
| 2. | Minerals are an economical source of metal |
| 3. | Extraction of metal from ores is difficult. |
| 4. | None of the above |
Copper matte is put in silica lined converter to :
| 1. | Remove the remaining H2SO4 and H2S present in the matte as slag. |
| 2. | Remove the remaining MnO and FeS present in the matte as slag. |
| 3. | Remove the remaining Fe2O3 and Fe2S present in the matte as slag. |
| 4. | Remove the remaining FeO and FeS present in the matte as slag. |
The role of cryolite in the metallurgy of aluminium is :
| 1. | To decrease the melting point of the mixture from 2323 K to 1140 K |
| 2. | To increase the electrical conductivity of |
| 3. | To decrease the electrical conductivity of |
| 4. | Both '1' and '2' |
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