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:
No explanation available. Be the first to write the explanation for this […]
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 […]
The method not used in metallurgy to refine the impure metal is
Options
(a) Mond’s process (b) Van-Arkel process (c) Amalgamation process (d) Liquation
Correct Answer:
Amalgamation process
Explanation:
No explanation available. Be […]
Which of the following sulphides when heated strongly in air gives the corresponding metal
Options
(a) Cu₂S (b) CuS (c) HgS (d) FeS
Correct Answer:
HgS
Explanation:
No explanation available. Be the first […]
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