In the extraction of aluminium from bauxite, cryolite is used to
Options
(a) decreases the boiling point of aluminium (b) purify the bauxite (c) make the mass lighter (d) decreases melting point of […]
Galena is an ore of
Options
(a) Pb (b) Sn (c) Hg (d) Zn
Correct Answer:
Pb
Explanation:
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When the ore limestone is heated carbon dioxide is given off. This operation in metallurgy is known as
Options
(a) smelting (b) ore dressing (c) calcination (d) roasting
Correct Answer:
calcination
Explanation:
CaCO₃(s) → […]
Froath floataton proess is used for the concentration of
Options
(a) amalgams (b) chloride ores (c) oxide ores (d) sulphide ores
Correct Answer:
sulphide ores
Explanation:
No explanation available. Be the first to […]
Cassiterite is concentrated by
Options
(a) flustation (b) liquation (c) levigation (d) electromagnetic separation
Correct Answer:
levigation
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
Which one of the following is true in electrolytic refining
Options
(a) Impure metal is made cathode (b) Impure metal is made anode (c) Impure metal is made cathode and pure metal as […]
Impurities present in the ore react to form a fusible substance known as
Options
(a) flux (b) gangue (c) nugget (d) mineral
Correct Answer:
gangue
Explanation:
flux + Gangue → Slag.
Hydro-metallurgical process of extraction of metals is based on
Options
(a) Complex formation (b) Hydrolysis (c) Dehydration (d) dehydrogenation
Correct Answer:
Complex formation
Explanation:
For example, Ag₂S is converted into Na[Ag(CN)₂]. When Zn […]
Which metal is extracted by complexing with KCN
Options
(a) Cu (b) Sn (c) Pb (d) Ag
Correct Answer:
Ag
Explanation:
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Which one of the following is not a sulphide ore
Options
(a) Magnetic (b) Iron pyrites (c) Galena (d) Sphalerite
Correct Answer:
Galena
Explanation:
No explanation available. Be the first to write the […]
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