Metallurgy
ICSE · Class 10 · Chemistry
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Which of the following is the main ore of aluminium?
The process of heating carbonate ores in absence of air is called:
The impurities present in ores are called:
Which process is used to purify bauxite ore?
Sample Questions
Which methods are used for concentration of ores? (Select all correct answers)
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Hydraulic washing, Magnetic separation, Froth flotation
Hydraulic washing, magnetic separation, and froth flotation are all methods used for ore concentration. Electrolysis is used for metal extraction, not ore concentration.
In the Hall-Heroult process, which substance is used as electrolyte?
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Al₂O₃ + Na₃AlF₆ + CaF₂
In Hall-Heroult process, purified alumina (Al₂O₃) is dissolved in molten cryolite (Na₃AlF₆) with fluorspar (CaF₂) to lower melting point and increase conductivity.
Which metals can be extracted by electrolytic reduction? (Select all correct answers)
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Sodium, Aluminium, Potassium
Highly electropositive metals like Na, K, Al are extracted by electrolytic reduction. Iron and copper are less electropositive and can be reduced chemically.
Brass is an alloy of:
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Copper and zinc
Brass is an alloy containing 80% copper and 20% zinc. Bronze is copper and tin, steel is iron and carbon, solder is lead and tin.
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