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

The chemical name for rust is ....

  1. Carbon Monoxide

  2. Iron Oxide

  3. Carbon Dioxide

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

Rust is the common name for iron oxide, which forms when iron reacts with oxygen in the presence of water or moisture.

Multiple choice

Malleability and ductility of metals can be accounted due to 

  1. The presence of electrostatics force

  2. The crystalline structure in matter

  3. The capacity of layers of metal ions to slide over the other
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metallic bonding allows layers of metal ions to slide over each other without breaking the bonds, which is why metals are malleable and ductile.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Reactants of superphosphate are mixed in a ____________ chamber with a mechanical stirrer and two valves at the bottom. 

  1. cast iron

  2. stainless steel

  3. mild stainless steel

  4. copper
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A well powdered phosphate rock or bone ash mixed known quantity of concentrate sulphuric acid is introduced into a cast iron chamber provided with mechanical stirrer and two valves at bottom. Each valve opens in a big chamber called den. The mixture is stirred for 2 to 5 minutes and then  dumped mechanically into one of the dens through the valve. The mass is kept in the den for about 24 hours.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which of the following(s) is/are correct for magnesium and zinc?

  1. $MgO$ and $ZnO$ are amphoteric
  2. $MgCO _3$ and $ZnCO _3 $ both on heating give corresponding oxides

  3. Both are used as electrodes

  4. Both are used to prevent corrosion
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation
Option $(B)\ ,(C),\ (D)$ are correct. They all are facts.
$MgO$ is basic while $ZnO$ is amphoteric in nature.
Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

Find the incorrect match.

  1. Fine duct of aluminium - Paints and Lacquers

  2. Reducing agent in the manufacture of dye-stuffs, paints, etc. - copper dust

  3. For cutting tools and crushing machines - Chrome steel

  4. For making cables, automobiles and aeroplane parts - Nickel steel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The fine duct of aluminium is used in paints and lacquers. For cutting tools and crushing machines chrome steel is used.

For making cables, automobiles and aeroplane part – nickel steel is used. But copper dust is not used as a reducing agent in the manufacture of dyestuffs and paints. So this second is the mismatch.

Correct option is B.

Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

Which of the following metal is used for galvanising iron to protect it from rusting?

  1. $Al$
  2. $Cu$
  3. $Co$
  4. $Zn$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zinc is used for galvanising iron to protect it from rusting. Using a less reactive metal than iron would allow iron to get in contact with air & moisture somehow which will lead to peeling up of the covering metal. Zinc is used because Zn corrodes faster than Iron protecting the Fe surface from corrosion.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The formation of metal oxide on the surface of metal is called:

  1. cathodising

  2. anodizing

  3. acidification

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

The formation of metal oxide on the surface of metal is called anodizing. For example: aluminium oxide is formed on the surface of aluminium when it is exposed to air which prevents its corrosion.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Aluminium does not oxidize readily in air because :

  1. it is high in the electrochemical series

  2. it is low in the electrochemical series

  3. the metal does not combine with oxygen

  4. the metal is covered with a layer of oxide which does not rub off
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aluminium is soft silvery metal, yet the surface gets tarnished due to the formation of film of its oxide $Al _2O _3$.
When aluminium is exposed to moist air a thin film of  oxide layer which is thin, hard and adhering.
$4Al+3O _2 \rightarrow 2Al _2O _3$

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which of the following compounds can be reduced to copper when heated with coke?

  1. Copper sulphate

  2. Copper oxide

  3. Hydrogen chloride

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

The metals, which are low in the reactive series, undergo reduction reaction. Their metal oxides react with carbon to reduce the metal oxide to its metal and form an oxide of carbon.
$2CuO+C \rightarrow 2Cu+CO _2$

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Stainless steel is a:

  1. homogenous mixture

  2. heterogenous mixture

  3. solid solution of two immiscible solids

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

Stainless steel is a metal alloy made up of steel mixed with elements such as chromium, nickel, molybdenum, silicon, aluminium, and carbon. The content of these elements is not uniform throughout the solid solution which is a necessary condition to be a homogenous mixture. Thus stainless steel is a heterogeneous mixture.


Option (B) is correct.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Why alloys are always considered as mixtures?

  1. They have a fixed composition

  2. They shows the properties of its constituents

  3. They can be seperated into its constituents by physical method

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alloys are homologous mixtures of metals and cannot be separated into its constituents by physical methods. It is still considered a mixture because it shows the property of its constituents and can have variable composition.


Hence, the correct option is $\text{B}$