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 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.

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 generally extracted by electrolysis of their fused salts are highly:

  1. electropositive

  2. electronegative

  3. depends on temperature

  4. depends on impurities in the metal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Highly electropositive metals (like alkali and alkaline earth metals) have very negative standard reduction potentials, making them difficult to reduce by chemical means. Electrolysis of their fused salts is the standard industrial method for their extraction.

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

Molten silver absorbs _________ which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

  1. carbon monooxide

  2. carbon dioxide

  3. carbon

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

Molten silver absorbs oxygen which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

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

Classify the following as physical or chemical properties.
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.

  1. Physical property

  2. Chemical property
  3. Both $A$ and $B$
  4. Neither $A$ or $B$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Steel is an alloy of various metals, physically combined together in a fixed amount by weight, to improve the physical and mechanical properties.

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

Which of the following is/are true about silver plating?

  1. The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.

  2. The article to be silver plated is made the anode

  3. Cathode consists of pure silver.
  4. The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

The following are true about silver plating.
The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.
The article to be silver plated is made the cathode.
Anode consists of pure silver.
The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Nitriding is a process of heating steel in atmosphere of:

  1. $NH _{3}$
  2. $N _{2}$

  3. oxygen

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

Nitrating is a process of heating high carbon steels, aluminium, molybdenum etc in atmosphere of $NH _3$. Because of nitrating a case hardened surface of $N _2$ is formed on metal surface which comes from Ammonia.

Multiple choice

Sidneys hunting knife is made of stainless steel.

  1. Sidneys' hunting knife is made of stainless steel.

  2. Sidneys, hunting knife is made of stainless steel.

  3. Sidne'ys hunting knife is made of stainless steel.

  4. Sidney's hunting knife is made of stainless steel.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sidney's is the singular possessive form of the name Sidney.

Multiple choice

The Iron Man suit is made of a gold titanium alloy. How is an alloy made?

  1. Melting together 1+ metal with 1+ element

  2. Freezing 2 or more metals together

  3. A mixture of at least 3 elements

  4. Melting together 1 gas with at least 1 liquid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An alloy is a metallic substance composed of two or more elements, at least one of which is a metal, usually created by melting them together.