Chemical Process Technology Mcqs


What is electro galvanizing?

A) Copper plating B) Zinc plating
C) Aluminium plating D) Lead plating
Answer & Explanation Answer: B) Zinc plating

Explanation: Electro galvanizing is the name given to zinc plating when applied continuously to steel. Copper plating is the plating copper on an item electrolytically.

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Which is the third most extensively used non-ferrous metal?

A) Lead B) Copper
C) Zinc D) Aluminium
Answer & Explanation Answer: C) Zinc

Explanation: Zinc is the third most extensively used nonferrous metal next to aluminium and copper. Zinc tends to lose its identity in the product.

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Why is lead used in ceramic industry?

A) To increase strength B) To increase water resistance
C) To increase lustre D) To increase electrical conductivity
Answer & Explanation Answer: C) To increase lustre

Explanation: Lead compounds impart low surface tension and low viscosity over a wide temperature range which results in smoothness and adds lustre.

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Lead is used as a sheathing material on cables.

A) True B) False
Answer & Explanation Answer: A) True

Explanation: Lead is used as a sheathing material on cables to prevent ingress of moisture. It is an important strategic material.

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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
Answer & Explanation Answer: D) Roasting-Smelting-Converting

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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Which method is used to extract copper from sulphide ores?

A) Froth floatation B) Leaching
C) Screening D) Mechanical agitation
Answer & Explanation Answer: A) Froth floatation

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.

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Which among the following is an ore of copper?

A) Hematite B) Magnetite
C) Chalcopyrite D) Siderite
Answer & Explanation Answer: C) Chalcopyrite

Explanation: The predominant ore of copper is chalcopyrite (CuFeS?). Hematite, magnetite and siderite are ores of iron.

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How is carbon electrodes formed in an electrolytic aluminium smelting cell?

A) From Alumina B) By Replacing the old electrodes
C) From coke and carbon dioxide D) From coke and pitch
Answer & Explanation Answer: D) From coke and pitch

Explanation: Carbon electrodes are formed continuously from coke and pitch. Pitch is a soft to hard and brittle coal substance.

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