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 chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Metals are usually hard. Hence metals are strong and can withstand heavy loads over them. Due to this property, they are difficult to cut and can be used in the construction of heavy machines, building etc.
On the other hand, non-metals are usually brittle. On hammering them they break into small pieces converting themselves into a fine powder.


In the following elements identify the elements that is relatively brittle?

  1. Sulphur

  2. Diamond

  3. Iron

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

Diamond is the hardest non-metallic element which is an exception. Sulphur is a non metal and is relatively brittle while others are metals and are hard, but not brittle.


Therefore, option A is correct.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

1 kg of iron occupies less space compared to 1 kg of sponge. Why?

  1. Iron has less density than sponge

  2. Iron and sponge have equal densities

  3. Iron has more density than sponge

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
We have 2 materials here in which iron is metal and Sponge is non-metal.
 Metals has usually high density as compared to non-metals.
  and Density*Volume = Mass
  Iron occupies less space because it has high density.
Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Door locks are made of metals because metals:

  1. have lustre

  2. are opaque

  3. are good conductors of heat

  4. are hard and strong
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Door locks are usually needed to be strong to stop thieves or other trespassing. 

So we need a hard and strong material for the manufacturing of locks and metals are feasible for this purpose.

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

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Mark the correct statement.
a) Metals lose their lustre on keeping in air.
b) Gold is lustrous.
c) Metals are lustrous and can be polished.

  1. a, b

  2. b, c

  3. a, c

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

Metals lose their lustre when kept exposed to air for long time and gets a dull appearance. It loses most of its shine and lustre.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Which of the following is used to galvanize metals, making them resistant to oxidation (rusting)?

  1. Zinc

  2. Iron

  3. Tin

  4. Aluminium

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

Zinc is used to galvanize metals, making them resistant to oxidation (rusting). Zinc is stronger reducing agent than the metal to be galvanized (such as iron) and hence, zinc can be more easily oxidised. Thus, during corrosion, zinc is oxidised. This prevents corrosion (rusting) of other metal.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Metals are usually hard. Hence metals are strong and can withstand heavy loads over them. Due to this property, they are difficult to cut and can be used in the construction of heavy machines, building etc.
On the other hand, non-metals are usually brittle. On hammering them they break into small pieces converting themselves into a fine powder.


Thus an element that is relatively strong is relatively :

  1. Brittle

  2. Malleable

  3. Hard

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

Element that is relatively strong have strong force of attraction and difficult to break and are considered to be relatively hard.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Why are metals lustrous?

  1. Light is transmitted through delocalized electrons

  2. They have a high boiling point

  3. Light is reflected through delocalized electrons

  4. Light does not travel through metals at all
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A metal is a lattice of metal "ions" in a "sea" of delocalised electrons - mobile electrons. Photons of light do not penetrate very far into the surface of a metal and are typically reflected, or bounced off, the metallic surface, by the mobile electrons and what you get is metallic reflection, which is lustrous.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Why iron is used widely in construction of buildings, bridges, railway lines etc?

  1. Iron is a good conductor of electricity

  2. Iron is ductile

  3. Iron have high tensile strength

  4. Iron is malleable
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metals (except sodium, potassium) have very high tensile strength.
For example - iron can bear a lot of tensile strength. So, it is used in construction of buildings, bridges, railway lines etc.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The most durable metal plating on iron to protect against corrosion is :

  1. Tin plating

  2. Zinc plating

  3. Copper plating

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

Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc. Hence, zinc plating is the most durable metal plating on iron to protect against corrosion.

Multiple choice chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following are uses of sulphur?

  1. Sulphur is used in preparation of conducting wires

  2. A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide

  3. Sulphur is an element belonging to VI A group

  4. Sulphur is a nonmetallic element.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

Zinc on heating with sulphur produces a greyish residue of zinc sulphide.
Sulphur is an element belonging to VI A group.
Sulphur is a nonmetallic element.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Metals can be beaten into thin sheets. This property is called:

  1. ductility

  2. elasticity

  3. volatility

  4. malleability
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Malleability is a substance's ability to deform under pressure ( compressive stress). If malleable, a material may be flattened into thin sheets by hammering or rolling. Malleable materials can be flattened into metal leaf. Many metals with high malleability also have high ductility.