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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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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’. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology‘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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCopper 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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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