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

Subtopic:  Refining Process |
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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’.

Subtopic:  Refining Process |
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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.

Subtopic:  Refining Process |
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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.

Subtopic:  Refining Process |
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‘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

Subtopic:  Refining Process |
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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.

Subtopic:  Refining Process |
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Consider the following statements:

a. Zone refining method is useful for producing semiconductors and other metals of very high purity.
b. Zone refining method is based on the principle that "the impurities are less soluble in the melt than in the solid-state of the metal".
c.

In column chromatography, the most readily adsorbed substances are retained near the top.

d. In column chromatography, the stationary phase is packed in a glass tube.


Select the correct statements.

1. a, c, d

2. a, b

3. b, c

4. a, b, c, d

Subtopic:  Refining Process |
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Vapour phase refining process is used for refining :

1. Ni

2. Ti

3. Zr

4. All of the above

Subtopic:  Refining Process |
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The incorrect statement(s)among the following is/are:

1. Zone refining is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid-state.
2. Electrolytic refining is the process of refining impure metals by using electricity.
3. The impurities present in the impure metal gets collected below the anode in the electrolytic refining process.
4. None of the above

Subtopic:  Refining Process |
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