Engineering Questions with Answers - Multiple Choice Questions

Chemical Industry MCQ’s – Copper

1 - Question

Which among the following is an ore of copper?
a) Hematite
b) Magnetite
c) Chalcopyrite
d) Siderite
View Answer Answer: c
Explanation: The predominant ore of copper is chalcopyrite (CuFeS2). Hematite, magnetite and siderite are ores of iron.

2 - Question

Which method is used to extract copper from sulphide ores?
a) Froth floatation
b) Leaching
c) Screening
d) Mechanical agitation
View Answer Answer: a
Explanation: In froth floatation process, the ore is added to water and other reagents and is mechanically agitated forming bubbles. As the bubble rises it carries the copper along.

3 - Question

What are the steps involved in purifying copper? (In order of precedence)
a) Smelting-Roasting-Converting
b) Smelting-Converting-Roasting
c) Converting-Roasting-Smelting
d) Roasting-Smelting-Converting
View Answer Answer: d
Explanation: Water is first removed by roasting. Steamed air is sent in to remove the volatile impurities. The final is conversion of matte.

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