Chemistry ยท Science General

Metallurgical Processes

1,436 Questions

This section explores key metallurgical processes including ore concentration, pyrometallurgy, and metal refining. It also covers corrosion and the properties of refractory materials. These chemistry questions are relevant for engineering and science entrance tests.

Pyrometallurgy furnacesMetal refining techniquesCorrosion protection methodsOre concentrationAuto reduction process

Metallurgical Processes Questions

Multiple choice

Electroplating is done to

  1. Increase the size and shape

  2. To make water resistance

  3. Make it more stronger

  4. Make it corrosion free and scratch resistance
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

electroplating is done to prevent corrosion.

Multiple choice

It is easier to hold an earthen pot than a steel pot as

  1. Steel pot has more friction

  2. Earthen pot has less friction

  3. Earthen pot has more friction

  4. Steel pot is comparatively heavier
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earthen pot is easier to hold as it has more friction, hence, does not slips from hands easily.

Multiple choice

Corrosion is a chemical reaction that involves

  1. inside of the object changing from an element to a compound

  2. surface of the object changing from an element to a compound

  3. nothing happens

  4. surface of the object changes from one element into another element
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Corrosion is a chemical reaction that involves surface of an object changing from an element to a compound.

Multiple choice

Galvanization is the process by which the iron is protected from rusting, but this process is not used for food containers. Which is the correct reason?

  1. Acids present in food react with zinc to form poisonous compounds.

  2. Rusting does not take place in food container, as it is always closed.

  3. Food cans are painted since galvanization is costly.

  4. Zinc oxide is an amphoteric oxide.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Zinc is a reactive metal and reacts readily with acids to form respective salts which are poisonous in nature.

Multiple choice

Which of the following statements is correct about burning and rusting?

  1. Both are chemical changes

  2. Air and moisture are necessary in both cases.

  3. Rusting is fast oxidation but burning is slow oxidation.

  4. Mass increases in both the cases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In burning, only oxygen is required but rusting takes place in the presence of both oxygen and moisture.

Multiple choice

____is the ability of metal to be drawn into thin wires.

  1. Malleability

  2. Ductility

  3. Metallurgy

  4. Electroplating
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ductility is the physical property of a metal that allows it to be drawn into thin wires. Malleability refers to the ability to be hammered into thin sheets.

Multiple choice

Which of the following statements is/are false? a. The rust on iron is formed when iron combines with hydrogen to form iron oxide. b. Very little heat and no light is released in the process of rusting of iron. c. In the Sun, heat and light are produced due to nuclear reactions in which hydrogen is converted into helium.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rust on iron is formed when iron combines with hydrogen to form iron oxide, is a false statement. Thus, it is the correct option. The rust on iron is formed when iron combines with oxygen in the air to form iron oxide.