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Extraction of Metals

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30 Questions

What is the purpose of adding freshly precipitated aluminium hydroxide to the filtrate?

To remove impurities from the filtrate

Which process involves the reaction between an oxide and aluminium powder to produce a metal?

Aluminothermic process

What is the purpose of smelting in the extraction of metals?

To separate the metal from its ore

What is the distinguishing feature of the self-reduction process?

It does not require an external reducing agent

Which process is used to extract metals such as chromium and manganese on a commercial scale?

Aluminothermic process

What is the primary purpose of the electrolytic refining process?

To remove impurities from the metal by deposition on the cathode

Which of the following statements is TRUE about the reverberatory furnace?

The fuel burns in a separate part and does not mix with the charge

What is the reaction at the anode during the extraction of sodium?

Cl⁻ → Cl + e⁻

What is the primary difference between calcination and roasting?

Calcination is used to convert metal oxides into metals, while roasting is used to convert metal sulfides into oxides

What is the process of extracting metals like gold and silver from their native ores?

Amalgamation process

What is the primary purpose of leaching in metallurgy?

To extract metals from their ores by dissolving the ore in a solvent

What is the primary difference between smelting and refining?

Smelting is used to extract metals from their ores, while refining is used to purify metals

What is the reaction of tin oxide with carbon?

SnO₂ + 2C → Sn + 2CO

What is the purpose of refining metals?

To purify impure metals

What is the method of extraction used for metals like cadmium, copper, and silver?

Precipitation or metal displacement method

What is the primary purpose of cupellation?

To purify silver by removing lead impurities

What is the final product obtained through Mond's process?

Pure nickel

Which of the following metals are refined using the Van Arkel process?

Ti, Zr, Hf

What is the principle behind zone refining or fractional crystallisation?

Difference in solubility of impurities in molten and solid state of metals

What is the result of heating impure silver in a blast of air using cupellation?

Oxidation and removal of lead impurities

Which method of refining involves the decomposition of a compound into a pure metal?

Thermal dissociation

What is the primary method of refining easily fusible metals like lead and tin?

Liquation

Which of the following metals can be purified by distillation?

Zinc and Mercury

What is the purpose of fractional distillation in the metallurgy of zinc?

Separating cadmium from zinc

Which of the following methods of refining involves the formation of a compound, which is then decomposed into a pure metal?

Thermal dissociation

What is the primary purpose of concentration or dressing of the ore?

To separate the large bulk of impurities from the ore

Which type of ores are very few in nature?

Metallic halides

What is the name of the process that separates ore particles based on the difference in specific gravity?

Gravity Separation or levigation

What is the name of the table used in the gravity separation process?

Wilfley table

What is the term used to describe the large amount of unwanted impurities in the ore?

Gangue or matrix

This quiz covers the process of extracting aluminium, including the precipitation of aluminium hydroxide and the reduction of metallic oxides using the Goldschmidt alumino thermic process.

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