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 of the following statements is/are not correct?

  1. Mn metal is used as a scavenger in making steel.
  2. All known isotopes of Tc are radioactive, except Tc98.
  3. Re is used in the making of electric furnace windings and spectrophotometer filaments.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because Technetium (99Tc) was the first man-made element with radioactive property. All known isotopes of technetium (includes 97Tc, 98Tc) have radioactive properties. It is one of the fission products of uranium. It is obtained by spent fuel rods in nuclear reactors.

Multiple choice

Which of the following statements is/are incorrect?

  1. CuCl2 is used as a catalyst in the manufacture of ammonia by Haber process.
  2. CuCl exhibits blue colour in an aqueous solution.
  3. Fractional crystallisation of metals to get the purest form is known as zone-refining.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct answer. CuCl2 is used as a catalyst in Deacon process for the preparation of Cl2 from HCl. CuCl, in an aqueous solution, forms Cu ions, which possess no colour due to the presence of completely filled d-orbitals.

Multiple choice

Which of the following statements is/are incorrect?

  1. In floatation process, ZnO and SO3 are formed from sulphide ores.
  2. Fe is used as coating material to prevent the corrosion of Zn.
  3. Cd metal is used in nuclear reactors as a neutron excitation material.
  4. Mercury is used extensively in the production of sodium hydroxide and chlorine gas commercially.

  1. Only 1

  2. 2 and 3

  3. 3 and 4

  4. 1, 2 and 3

  5. 2, 3 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because Zn is used as a coating material to prevent the corrosion of Fe. Cd metal absorbs neutrons very well, and is used to make control rods in nuclear reactors.

Multiple choice

Which of the following are methods for production of sulphuric acid?

  1. Contact process
  2. Deacon’s process
  3. Birkland Eyde process
  4. Lead chamber process Select the correct answer.

  1. 1 and 2 only

  2. 1 and 3 only

  3. 1 and 4 only

  4. 1, 3, and 4 only

  5. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The contact process is the current method of producing sulphuric acid In 1746 John Roebuck developed the lead chamber process for the manufacture of sulfuric acid. 

Multiple choice

The process of protecting iron made water pipes with zinc layering to prevent corrosion is called __________.

  1. zinc plating

  2. alloy formation

  3. vulcanization

  4. galvanization

  5. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Process in which a zinc film is deposited on goods made of steel to provide long term (generally 10 to 30 years) corrosion protection and abrasion resistance. Two common galvanizing processes are (1) Hot metal bath: about 250 years old but still a popular method in which the item is immersed in molten zinc to deposit a 50 to 150 micron thick film. (2) Electro-deposition: a more recent method in which a 5 to 30 micron thick film of zinc is deposited electrochemically.

Multiple choice

Rusting of iron is due to the reaction of iron with ______.

  1. oxygen and cabon dioxide

  2. oxygen and water

  3. cabon dioxide only

  4. oxygen only

  5. carbon dioxide and water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mixture of iron with oxygen from water and in the air is what causes rust. When moisture or water meets with iron, oxygen in the water combines with atoms of the iron to form iron oxide. The iron oxide is the reddish coating on the surface which is commonly referred to as rust.

Multiple choice

Which of the following is/are the applications of the chemical effects of electric current in industries? a. Electroplating of metals b. Purification of metals c. Production of chemical compounds d. Decomposing chemical compounds

  1. a and b

  2. b and c

  3. a, b and c

  4. a and d

  5. all of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as all of the above are the applications of the chemical effects of electric current in industries.

Multiple choice

Which of the following is/are the conditions that should be taken into consideration while electroplating? a. The metal object on which electroplating is to be done should be made using the negative electrode. b. The metal whose layer is to be deposited should be made using the positive electrode. c. A water soluble salt of the metal should be deposited if taken as an electrolyte.

  1. Only a

  2. Only a and b

  3. Only b and c

  4. Only c

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as all the above are the conditions that should be taken into consideration while electroplating.

Multiple choice

Which of the following statements is/are false? a. The chemical decomposition produced by passing an electric current through a conducting liquid is called electrolysis. b. Sodium metal is produced by the electrolysis of molten sodium carbonate. c. Fresh fruits and vegetables conduct electricity to some extent due to the presence of various salt solutions in them.

  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

Statement 'b' is a false statement. Thus, it is the correct option. Sodium metal is produced by the electrolysis of molten sodium chloride, and not sodium carbonate.

Multiple choice

Which of the following statements is not correct?

  1. Copper can be formed into wires.

  2. Aluminium can be beaten into thin sheets.

  3. The solution of magnesium oxide turns red litmus blue.

  4. Copper wires are used in electric circuits.

  5. Gold, in contact with lemon juice, turns blackish in colour.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Gold does not react with citric acid as it is the least reactive metal.

Multiple choice

Which of the following statements is correct?

  1. Zn is displaced by Cu from ZnSO4 solution.

  2. Immersion rods can be made of aluminium.

  3. Lemon pickle can be put in aluminium vessel.

  4. Potassium is stored in water to avoid its reaction with air.

  5. Sulphur dioxide being basic in nature, turns red litmus blue.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals are good conductors of heat and electricity.

Multiple choice

Which of the following statements are true: a. Metals loose their luster gradually when exposed to air and moisture for long time. b. Stone is a transparent material. c. Compressed natural gas is a domestic fuel used in kitchens for cooking purposes.

  1. only b

  2. b and c

  3. a and b

  4. a and c

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

This is the correct option. Metals react with air and moisture chemically to form their oxides. When the surface of metals are polished, the oxides fall and metals regain their luster.