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General Principles and Processes of Isolation of Elements NEET MCQ & Practice Questions

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General Principles and Processes of Isolation of Elements Revision Guide for NEET Chemistry

General Principles and Processes of Isolation of Elements is part of NEET Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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  • Important equations or relationships
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  • Frequently confused concepts
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  • Error review and targeted revision

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Top 20 General Principles and Processes of Isolation of Elements MCQs with Answers

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NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

1. The first major step in metallurgy after mining an ore is usually:

  • A. Alloy formation
  • B. Zone refining
  • C. Concentration of the ore
  • D. Electrolytic refining
Answer: C
Explanation: Gangue is removed by concentrating the ore before chemical reduction or refining.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

2. Hydraulic washing is based primarily on differences in:

  • A. Solubility in organic solvents
  • B. Densities of ore and gangue
  • C. Magnetic properties
  • D. Volatility
Answer: B
Explanation: A stream of water separates heavier ore particles from lighter gangue.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

3. Magnetic separation is suitable when:

  • A. Either the ore or gangue is magnetic
  • B. Both components have identical magnetic behaviour
  • C. The ore is volatile
  • D. The gangue is soluble in water only
Answer: A
Explanation: A magnetic field separates components with different magnetic susceptibilities.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

4. Froth flotation is mainly used to concentrate:

  • A. Oxide ores only
  • B. Carbonate ores only
  • C. Native metals only
  • D. Sulphide ores
Answer: D
Explanation: Sulphide particles are preferentially wetted by oil and carried into froth, while gangue remains water-wetted.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

5. In froth flotation, pine oil commonly acts as:

  • A. A reducing agent
  • B. A flux
  • C. A frother
  • D. A depressant
Answer: C
Explanation: Pine oil stabilises the froth containing ore particles.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

6. In the separation of ZnS and PbS by froth flotation, NaCN may be used to:

  • A. Act as a flux
  • B. Depress ZnS
  • C. Activate ZnS
  • D. Oxidise PbS
Answer: B
Explanation: NaCN forms a complex with Zn2+ at the ZnS surface and prevents its flotation, allowing PbS to float.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

7. Leaching of bauxite with concentrated NaOH is possible because alumina is:

  • A. Amphoteric
  • B. Strongly acidic only
  • C. Strongly basic only
  • D. Insoluble in all alkalis
Answer: A
Explanation: Al2O3 dissolves in NaOH as soluble aluminate, while many impurities remain undissolved.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

8. The cyanide process is used for extraction of:

  • A. Iron and copper only
  • B. Aluminium
  • C. Zinc only
  • D. Gold and silver
Answer: D
Explanation: Au and Ag dissolve in aerated cyanide solution by forming soluble dicyano complexes.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

9. In cyanide leaching of gold, zinc is added mainly to:

  • A. Form gangue
  • B. Act as a frother
  • C. Displace gold from its cyanide complex
  • D. Oxidise gold
Answer: C
Explanation: Zinc is more electropositive and displaces gold from [Au(CN)2]−.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

10. Calcination involves heating an ore:

  • A. Only below room temperature
  • B. In limited or no air
  • C. In excess air always
  • D. Under water
Answer: B
Explanation: Calcination removes volatile matter and converts carbonates or hydrated ores into oxides under limited air.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

11. Roasting is especially suitable for:

  • A. Sulphide ores
  • B. Carbonate ores
  • C. Hydrated oxides only
  • D. Native metals
Answer: A
Explanation: Sulphide ores are heated in excess air to convert them into oxides and release SO2.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

12. During calcination of ZnCO3, the main solid product is:

  • A. ZnS
  • B. Zn
  • C. ZnSO4
  • D. ZnO
Answer: D
Explanation: ZnCO3 decomposes on heating to ZnO and CO2.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

13. Roasting of ZnS mainly produces:

  • A. ZnCO3
  • B. ZnSO4 only
  • C. ZnO and SO2
  • D. Zn and S2
Answer: C
Explanation: 2ZnS + 3O2 → 2ZnO + 2SO2 under roasting conditions.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

14. A flux is added during smelting to:

  • A. Produce froth
  • B. Convert gangue into fusible slag
  • C. Reduce the metal oxide directly in every case
  • D. Increase ore density
Answer: B
Explanation: Flux reacts with gangue to form an easily fusible slag.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

15. For silica gangue, a suitable basic flux is:

  • A. CaO
  • B. SiO2
  • C. P2O5
  • D. B2O3
Answer: A
Explanation: Basic CaO reacts with acidic SiO2 to form calcium silicate slag.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

16. In the blast furnace, limestone ultimately provides:

  • A. CO reducing gas directly only
  • B. Iron metal
  • C. Coke
  • D. CaO flux
Answer: D
Explanation: CaCO3 decomposes to CaO and CO2; CaO removes SiO2 as CaSiO3 slag.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

17. The principal reducing agent for Fe2O3 in the upper region of a blast furnace is:

  • A. N2
  • B. SiO2
  • C. CO
  • D. CaO
Answer: C
Explanation: Carbon monoxide reduces iron oxides stepwise to iron.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

18. Which metal oxide is most readily reduced by carbon under ordinary metallurgical conditions?

  • A. CaO
  • B. ZnO
  • C. Al2O3
  • D. MgO
Answer: B
Explanation: Zn lies below highly electropositive Al, Mg and Ca; ZnO can be reduced by carbon, whereas the others require electrolysis.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

19. Aluminium cannot be extracted by reducing Al2O3 with carbon because:

  • A. Al2O3 is extremely stable and carbide formation may occur
  • B. Carbon is not a reducing agent
  • C. Aluminium is less reactive than copper
  • D. Al2O3 is volatile
Answer: A
Explanation: The very negative free energy of formation of Al2O3 makes carbon reduction unfavourable, and Al4C3 may form.

NEET Chemistry · General Principles and Processes of Isolation of Elements · Very Hard

20. The thermite reaction uses aluminium to reduce:

  • A. Aluminium oxide
  • B. Alkali-metal chlorides
  • C. Sulphide ores directly
  • D. Metal oxides such as Fe2O3
Answer: D
Explanation: Al has strong affinity for oxygen and reduces less stable metal oxides with intense heat release.

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