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Extraction of metals PYQ 2023

Extraction of Metals:PYQ 2023

Extraction of Metals: Practice Questions

Q1. Among the following compounds, the number of those present in copper matte is _______.

  • A. CuCO3
  • B. Cu2S
  • C. Cu2O
  • D. FeO
Show Answer

Answer: B. Cu2S

Q2. The metal which is extracted by oxidation and subsequent reduction from its ore is

  • A. Ag
  • B. Fe
  • C. Cu
  • D. Al
Show Answer

Answer: B. Fe

Q3. Given below are two statements:
Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement II: During the Hall-Heroult electrolysis process, purified Al2O3 is mixed with Na3AlF6 to lower the melting point of the mixture.
In the light of the above statements, choose the most appropriate answer from the options given below:

  • A. Both statements are correct
  • B. Statement I is correct, Statement II is incorrect
  • C. Statement I is incorrect, Statement II is correct
  • D. Both statements are incorrect
Show Answer

Answer: A. Both statements are correct

Q4. In the extraction process of copper, the product obtained after carrying out the reactions:

    (i) 2Cu2S + 3O2 → 2Cu2O + 2SO2
    (ii) 2Cu2O + Cu2S → 6Cu + SO2

is called

  • A. Copper matte
  • B. Blister copper
  • C. Copper slag
  • D. Copper ore
Show Answer

Answer: B. Blister copper

Q5. The methods NOT involved in concentration of ore are

  • A. Liquation
  • B. Leaching
  • C. Electrolysis
  • D. Hydraulic washing
  • E. Froth flotation
Show Answer

Answer: C. Electrolysis

Q6. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.

Reason R: CO tends to get decomposed at higher temperature.

  • A. Both Assertion and Reason are correct
  • B. Assertion is correct, Reason is incorrect
  • C. Assertion is incorrect, Reason is correct
  • D. Both Assertion and Reason are incorrect
Show Answer

Answer: A. Both Assertion and Reason are correct

Q7. In Hall-Heroult process, the following is used for reducing Al2O3

  • A. Magnesium
  • B. Graphite
  • C. Na3AlF6
  • D. CaF2
Show Answer

Answer: C. Na3AlF6

Q8. The major component of which of the following ore is sulphide based mineral?

  • A. Siderite
  • B. Sphalerite
  • C. Malachite
  • D. Calamine
Show Answer

Answer: B. Sphalerite

Q9. Which of the following is used as a stabilizer during the concentration of sulphide ores?

  • A. Xanthates
  • B. Pine oil
  • C. Cresols
  • D. Fatty acids
Show Answer

Answer: A. Xanthates

Q10. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: In the Ellingham diagram, a sharp change in slope of the line is observed for Mg→MgO at ~1120°C.

Reason R: There is a large change of entropy associated with the change of state.

  • A. Both Assertion and Reason are correct
  • B. Assertion is correct, Reason is incorrect
  • C. Assertion is incorrect, Reason is correct
  • D. Both Assertion and Reason are incorrect
Show Answer

Answer: A. Both Assertion and Reason are correct

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