Principles of Metallurgy — Important Questions
Telangana Board · Class 10 · Physical Sciences
44 important questions from Principles of Metallurgy for Telangana Board Class 10 Physical Sciences, with answers. Written for the board exams 2027.
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Important Questions from Principles of Metallurgy
Which of the following are minerals?
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Bauxite (Al₂O₃·2H₂O), Haematite (Fe₂O₃), Rock salt (NaCl), Galena (PbS)
Minerals are naturally occurring compounds or elements found in earth's crust. Bauxite, haematite, rock salt, and galena are all minerals. Pure gold is a free metal, not a mineral compound.
Which metals are found in free state in nature?
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Gold (Au), Silver (Ag), Copper (Cu)
Gold, silver, and copper are least reactive metals and are found in free state (native form) in nature. Sodium and aluminum are highly reactive and always found in combined form.
The formula of bauxite is:
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Al₂O₃·2H₂O
Bauxite is the main ore of aluminum with the formula Al₂O₃·2H₂O. Fe₂O₃ is haematite (iron ore), ZnS is zinc blende, and CuFeS₂ is copper iron pyrites.
Which extraction method is used for highly reactive metals like sodium and aluminum?
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Electrolytic reduction
Highly reactive metals like sodium and aluminum require electrolytic reduction of their fused compounds because simple chemical reduction methods are not feasible at such high temperatures.
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