Chapter 6: Isolation of Elements

NCERT Solutions for CBSE Class 10 Chemistry — 16 solved questions with detailed explanations.

Questions

Topics

Solved Questions

Q1. Bauxite is the ore of:

Iron
Copper
Aluminium
Zinc

Difficulty: Easy · Topic: Ores

Solution

Bauxite (Al₂O₃·2H₂O) is the principal ore of aluminium. Extracted by Bayer process + Hall-Héroult electrolysis.

Q2. In the thermite process, the reducing agent is:

Carbon
Hydrogen
Aluminium
Sodium

Difficulty: Easy · Topic: Reduction

Solution

Thermite: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe. Aluminium reduces iron oxide at high temperature.

Q3. Haematite (Fe₂O₃) is the ore of:

Zinc
Aluminium
Copper
Iron

Difficulty: Easy · Topic: Ores

Solution

Haematite (Fe₂O₃) → Iron.

Q4. Bauxite (Al₂O₃) is the ore of:

Aluminium
Iron
Copper
Zinc

Difficulty: Easy · Topic: Ores

Solution

Bauxite (Al₂O₃) → Aluminium.

Q5. Chalcopyrite (CuFeS₂) is the ore of:

Zinc
Iron
Copper
Lead

Difficulty: Easy · Topic: Ores

Solution

Chalcopyrite (CuFeS₂) → Copper.

Q6. Galena (PbS) is the ore of:

Copper
Iron
Lead
Zinc

Difficulty: Easy · Topic: Ores

Solution

Galena (PbS) → Lead.

Q7. Sphalerite (ZnS) is the ore of:

Iron
Copper
Zinc
Lead

Difficulty: Easy · Topic: Ores

Solution

Sphalerite (ZnS) → Zinc.

Q8. Cassiterite (SnO₂) is the ore of:

Tin
Zinc
Copper
Lead

Difficulty: Easy · Topic: Ores

Solution

Cassiterite (SnO₂) → Tin.

Q9. Cinnabar (HgS) is the ore of:

Lead
Zinc
Mercury
Silver

Difficulty: Easy · Topic: Ores

Solution

Cinnabar (HgS) → Mercury.

Q10. Argentite (Ag₂S) is the ore of:

Copper
Gold
Silver
Mercury

Difficulty: Easy · Topic: Ores

Solution

Argentite (Ag₂S) → Silver.

Q11. Magnetite (Fe₃O₄) is the ore of:

Manganese
Nickel
Cobalt
Iron

Difficulty: Easy · Topic: Ores

Solution

Magnetite (Fe₃O₄) → Iron.

Q12. Cryolite (Na₃AlF₆) is the ore of:

Iron
Sodium
Calcium
Aluminium (flux)

Difficulty: Easy · Topic: Ores

Solution

Cryolite (Na₃AlF₆) → Aluminium (flux).

Q13. Electrolytic refining uses impure metal as:

electrolyte
cathode
salt bridge
anode

Difficulty: Easy-Medium · Topic: Isolation of Elements

Solution

anode.

Q14. Zone refining is based on:

distillation
chromatography
electrolysis
difference in solubility in solid and liquid phases

Difficulty: Easy-Medium · Topic: Isolation of Elements

Solution

difference in solubility in solid and liquid phases.

Q15. Mond process is used for refining:

gold
copper
silver
nickel

Difficulty: Easy-Medium · Topic: Isolation of Elements

Solution

nickel.

Q16. Van Arkel method uses:

electrolysis
zone melting
distillation
thermal decomposition of volatile compound

Difficulty: Easy-Medium · Topic: Isolation of Elements

Solution

thermal decomposition of volatile compound.

Other Chapters in Chemistry

Ch 1: Solid State Ch 2: Solutions Ch 3: Electrochemistry Ch 4: Chemical Kinetics Ch 5: Surface Chemistry Ch 7: p-Block Elements Ch 8: d & f Block Elements Ch 9: Coordination Compounds Ch 10: Haloalkanes & Haloarenes Ch 11: Alcohols Phenols Ethers Ch 12: Aldehydes Ketones Ch 13: Amines Ch 14: Biomolecules Ch 15: Polymers Ch 16: Chemistry in Everyday Life

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