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 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 & BiologyLeaching of low-grade copper ores does not involve
1. Cu getting converted into Cu2+(aq) in acidic medium
2. Cu getting converted into Cu2+(aq) in basic medium
3. Cu2+(aq) getting reduced to Cu
4. using bacteria in the presence of air.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe process in which Cl2 is obtained as a by-product is :
1. | In the electrolysis of aqueous HCl, Cl2 is obtained at the cathode as a by-product. |
2. | In the electrolysis of aqueous NaCl, Cl2 is obtained at the cathode as a by-product. |
3. | In the electrolysis of molten NaCl, Cl2 is obtained at the anode as a by-product. |
4. | None of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIncorrect statement(s) among the following options is/are:
1. | Roasting is done in a limited supply of air. |
2. | Calcination is done in the absence, or a limited supply of air. |
3. | Roasting is done in a regular supply of air. |
4. | All of the above. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology