Chemistry · 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

Which of the following statements is/are true about corrosion?

  1. In an electrochemical corrosion, corrosion occurs at anode, but rust is deposited at the cathode.
  2. Dry corrosion is slow process while wet corrosion is a fast process.
  3. In an electrochemical corrosion, corrosion does not depend on the size of the anodic part of the metal.
  4. Dry corrosion involves direct attack of the chemicals on the metal surface.

  1. Only 1, 2 and 3

  2. Only 2, 3 and 4

  3. Only 1, 3 and 4

  4. Only 1, 2 and 4

  5. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because all are true. In an electrochemical corrosion, corrosion occurs at the anode but rust is deposited at the cathode, dry corrosion is slow process while wet corrosion is a fast process, and it involves direct attack of the chemicals on the metal surface.

Multiple choice

Which of the following forms of corrosion occurs due to the concentration difference of two regions of same metal component?

  1. Pitting corrosion

  2. Stress corrosion

  3. Uniform corrosion

  4. Galvanic corrosion

  5. Crevice corrosion
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Crevice corrosion occurs due to the concentration difference of two regions of the same metal component. Corrosion takes place at the part that is of lower concentration. Thus, this option is correct.

Multiple choice

Which of the following statements is/are correct?

  1. Metal cladding is a process of sandwiching a metal between two corrosion resistant metals.
  2. In galvanising, zinc protects iron sacrificially.
  3. Thinner reduces viscosity of paint and increases it elasticity.
  4. Anodic coating is done by a metal, which is situated after the base metal in the electrochemical series.

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 3 and 4

  4. Only 2, 3 and 4

  5. Only 1, 2 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because all the three statements are true.

Multiple choice

Which of the following statements is INCORRECT?

  1. Pyrolusite is an ore of manganese.

  2. Manganese is more stable in +3 state than in +2 state.

  3. Mn(II) ion shows maximum paramagnetic character among bivalent ions of first transition series.

  4. Mn shows the greatest variation in possible oxidation numbers among 3d series elements.

  5. Mn is in zero oxidation state in Mn2(CO)10.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Manganese is more stable in the +2 state than in +3 state.

Multiple choice

Aluminium metal is extracted by the electrolysis of its _________.

  1. molten Chlorides

  2. molten Sulphide

  3. molten oxide

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

Aluminium is extracted from bauxite (Al2O3) by the Hall-Héroult process, which involves electrolysis of molten aluminium oxide dissolved in cryolite. Molten chlorides are not the source - bauxite is an oxide ore. The key is that alumina must be molten for electrolysis to work.