Chemistry ยท Science General

Metallurgical Processes

1,403 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

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 substances is used to store lithium, potassium and sodium metal to prevent their reaction with oxygen, moisture and carbon dioxide of air?

  1. Petrol

  2. Kerosene oil

  3. Mustard oil

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

Highly reactive alkali metals like sodium and potassium react vigorously with moisture and oxygen in the air. Kerosene oil is used to store them because it is non-reactive and prevents contact with air.

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.

Multiple choice

Which form of iron burns easily in air?

  1. Iron metal

  2. Iron filing

  3. Both (1) & (2)

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron filings have a much larger surface area compared to a solid block of iron metal. This increased surface area allows them to react more readily with oxygen in the air, causing them to burn easily.

Multiple choice

Rusting of iron is an example of

  1. rancidity

  2. corrosion

  3. anti-oxidant

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rusting is the chemical process where iron reacts with oxygen and moisture to form hydrated iron(III) oxide. This process is a common example of metal corrosion.

Multiple choice

The more volatile metal like Hg & Zn are purified by

  1. calcinations

  2. electrolytic refining

  3. distillation

  4. oxidative refining
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Distillation is an effective method for purifying metals with low boiling points, such as mercury (Hg) and zinc (Zn), as they can be vaporized and condensed away from non-volatile impurities.

Multiple choice

Stainless steel is an alloy of

  1. iron & nickel

  2. iron, chromium & nickel

  3. iron, chromium & zinc

  4. iron & manganese
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stainless steel is primarily an alloy of iron, chromium, and nickel. Chromium is added to provide corrosion resistance, while nickel improves the mechanical properties and corrosion resistance further.