Metallurgy Principles and Processes

Chemistry ⇒ Metals and Non-metals

Metallurgy Principles and Processes starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Metallurgy Principles and Processes. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

Describe the principle of electrolytic refining of metals.

Explain the difference between calcination and roasting.

Explain the term 'gangue' in metallurgy.

Explain why carbon cannot be used to reduce aluminium oxide to aluminium.

Explain why sulphide ores are usually converted to oxides before reduction.

In the context of metallurgy, what is meant by 'smelting'?

Name the impurity present in bauxite ore that is removed by leaching with sodium hydroxide.

Name the process by which impure metals are purified using the difference in their boiling points.

Name the process used for the extraction of gold and silver from their ores using a dilute solution of NaCN or KCN.

Name the process used to purify copper after extraction from its ore.

What is the main purpose of adding a flux during the extraction of metals?

What is the role of cryolite in the extraction of aluminium?

A metallurgist is considering two possible reducing agents, A and B, for the reduction of a metal oxide MO. The standard Gibbs free energy of formation (ΔG⁰_f) for AO and BO are -400 kJ/mol and -300 kJ/mol, respectively, while for MO it is -350 kJ/mol. Which reducing agent is thermodynamically more suitable for reducing MO to M? Justify your answer.

A sample of copper(II) oxide is reduced by hydrogen gas at 300°C. Write the balanced chemical equation for the reaction and calculate the mass of copper produced when 6.4 g of CuO is completely reduced. (Atomic masses: Cu = 63.5, O = 16)

During the extraction of zinc from zinc blende (ZnS), the ore is first concentrated and then roasted. Write the chemical equations for the roasting and subsequent reduction steps.

Explain the thermodynamic criterion for the feasibility of a metallurgical reduction reaction using Ellingham diagrams. How does the position of the lines in the diagram help in selecting a suitable reducing agent?

In the context of metallurgy, explain the significance of the term 'pyrometallurgy' and give one example of a metal extracted by this method.

The extraction of a certain metal involves the following steps: (i) Concentration by froth flotation, (ii) Roasting to form oxide, (iii) Reduction with carbon. Identify the metal and justify your answer.