Chapter Exam

Chapter 1: Metallurgy — Online MCQ Test

Q: Which method is commonly used to concentrate sulphide ores?

Answer: B. Froth flotation — Froth flotation is the standard method used to concentrate sulphide ores because the ore particles are preferentially wetted by oil and float with the froth.

Q: In Ellingham diagram, the line represents the Gibbs free energy change for the formation of:

Answer: B. Metal oxides — Ellingham diagrams plot the standard Gibbs free energy change for the formation of metal oxides as a function of temperature.

Q: Which metal is best purified by zone refining?

Answer: C. Silicon — Zone refining is used for very high purity semiconductors like silicon and germanium because impurities preferentially remain in the molten zone.

Q: Which of the following pairs is correctly matched?

Answer: B. Copper — Electrolytic refining — Copper is commonly purified by electrolytic refining. The other pairs are mismatched with respect to the ore or process.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 1: Metallurgy with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: This chapter explores extraction processes for metals from their natural ores. It covers concentration methods thermal reduction refining techniques and thermodynamic principles li.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Metallurgy — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 1: Metallurgy, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which method is commonly used to concentrate sulphide ores?

A. Hydraulic washing
B. Froth flotation ✓
C. Magnetic separation
D. Leaching

Answer: B. Froth flotation
Froth flotation is the standard method used to concentrate sulphide ores because the ore particles are preferentially wetted by oil and float with the froth.

In Ellingham diagram, the line represents the Gibbs free energy change for the formation of:

A. Metal chlorides
B. Metal oxides ✓
C. Metal sulphides
D. Metal carbonates

Answer: B. Metal oxides
Ellingham diagrams plot the standard Gibbs free energy change for the formation of metal oxides as a function of temperature.

Why is cryolite added during the extraction of aluminium?

A. To increase the melting point of alumina
B. To decrease the melting point and increase conductivity ✓
C. To act as a reducing agent
D. To remove silica impurities

Answer: B. To decrease the melting point and increase conductivity
Cryolite lowers the melting point of alumina and increases the conductivity of the molten mixture, making electrolysis easier.

Which metal is best purified by zone refining?

A. Iron
B. Copper
C. Silicon ✓
D. Zinc

Answer: C. Silicon
Zone refining is used for very high purity semiconductors like silicon and germanium because impurities preferentially remain in the molten zone.

Which of the following pairs is correctly matched?

A. Aluminium — Froth flotation
B. Copper — Electrolytic refining ✓
C. Zinc blende — Calcination
D. Bauxite — Roasting

Answer: B. Copper — Electrolytic refining
Copper is commonly purified by electrolytic refining. The other pairs are mismatched with respect to the ore or process.

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Chapter 2: p-Block Elements-I