Chemistry · 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

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.

Multiple choice

Nickel formate is used in

  1. the formation of ghee

  2. manufacturing of artificial silk

  3. paints

  4. antiseptic

  5. smokeless powder
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because nickel formate is used as a catalyst in the hydrogenation of oils to form ghee.

Multiple choice

Copper is refined by

  1. Roasting

  2. Oxidation

  3. Electrolysis

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

Electrolytic refining is the standard industrial process used to obtain high-purity copper. Impure copper is used as the anode and pure copper as the cathode in an electrolyte solution.

Multiple choice

Which of the following statements is/are false?

a. Rusting takes place only if the water and the oxygen come in contact with iron at the same time. b. The process by which plants prepare their food is an example of a physical change. c. The state of ice changes from solid to liquid on heating.

  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
C Correct answer
Explanation

This is the correct option as this statement is false. The process by which plants prepare their food is an example of a chemical change.

Multiple choice

Match the following ||| |---|---| |a. Crystallisation|1. It is the process of coating thin layer of zinc on iron sheets.| |b. Galvanisation|2. It is the process due to which iron rusts in the moist air. | |c. Rusting|3. It is the process of obtaining crystals from a hot saturated solution. |

  1. a-3, b-1, c-2

  2. a-3, b-2, c-1

  3. a-1, b-3, c-2

  4. a-1, b-2, c-3

  5. a-2, b-1, c-3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Crystallisation is the process of obtaining crystals from a hot saturated solution. Galvanisation is the process of coating thin layer of zinc on iron sheets. Rusting is the process due to which iron rusts in the moist air.

Multiple choice

If we keep moistened iron nails for a few days, the iron nails get covered with a reddish-brown substance, that is different from iron. Which of the following is/are not the changes that take(s) place?

a. The state as well as the composition of iron changed. b. The changes that took place were reversible. c. A new substance was formed.

  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
C Correct answer
Explanation

This is the correct option as the change that took place was not reversible. It is irreversible.

Multiple choice

Laterite is produced by

  1. Hydration and carbonation

  2. Hydration and calcification

  3. Hydrolysis and oxidation

  4. Leaching and oxidation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Laterite is produced by leaching and oxidation. Laterites are formed from the leaching of parent sedimentary rocks, metamorphic rocks and igneous rocks and mineralized proto-ores which leaves the more insoluble ions, predominantly iron and aluminium.