Chemistry ยท General Awareness

Chemistry of Metals and Alloys

1,762 Questions

Review the physical and chemical properties of various metals and their common alloys. This collection covers industrial applications, metallurgical processes, and practical uses of elements like silicon and boron. Practice these questions to strengthen your chemistry fundamentals for exams.

Properties of metalsCommon alloysIndustrial metallurgyChemical applications

Chemistry of Metals and Alloys Questions

Multiple choice

The filament of a light bulb is made of

  1. carbon

  2. lead

  3. iron

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

Tungsten is used for light bulb filaments because it has an extremely high melting point, allowing it to glow without melting when heated by electricity.

Multiple choice

German silver is an alloy of

  1. copper, silver and zinc

  2. copper, nickel and zinc

  3. silver, nickel and zinc

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

German silver is an alloy consisting of copper, nickel, and zinc. Despite its name, it contains no silver.

Multiple choice

Pb is the symbol of

  1. lead

  2. tin

  3. iron

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

Pb is the chemical symbol for Lead, derived from the Latin word 'plumbum'.

Multiple choice

Among the following which one is used in blue semiconductor lasers?

  1. Aluminium gallium arsenide

  2. Aluminium gallium indium phosphide

  3. Aluminium gallium nitride

  4. Aluminium gallium phosphide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium gallium nitride (AlGaN) is a semiconductor material. It is an alloy of aluminium nitride and gallium nitride. AlGaN is used to manufacture light-emitting diodes operating in blue to ultraviolet region, where wavelengths down to 250 nm (far UV) were achieved. It is also used in blue semiconductor lasers. It is also used in detectors of ultraviolet radiation, and in AlGaN/GaN HEMT transistors.

Multiple choice

Which of the followng metals are resistant to corrosion and oxidation in moist air?

  1. Noble metals

  2. Post-transition metal

  3. Poor metals

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

Noble metals are metals that are resistant to corrosion and oxidation in moist air, unlike most base metals.They tend to be precious, often due to their rarity in the earth's crust. The noble metals are considered to be (in order of increasing atomic number) ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold.

Multiple choice

The metals having outstanding catalytic properties are

  1. the alkali metals

  2. the alkaline earth metals

  3. refractory metals

  4. the platinum metals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The platinum group metals is a term used sometimes to collectively refer to six metallic elements clustered together in the periodic table. These elements are all transition metals.The platinum metals have outstanding catalytic properties. They are highly resistant to wear and tarnish, making platinum, in particular, well suited for fine jewellery. Other distinctive properties include resistance to chemical attack, excellent high-temperature characteristics, and stable electrical properties.

Multiple choice

The ferrite characterised by needle shaped crystallites is

  1. acicular ferrite

  2. ausferrite

  3. martensite

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

Acicular ferrite is a microstructure of ferrite that is characterised by needle shaped crystallites or grains when viewed in two dimensions. The grains, actually three dimensional in shape, have a thin lenticular shape. This microstructure is advantageous over other microstructures because of its chaotic ordering, which increases toughness.

Multiple choice

Brass is an example of

  1. an alloy

  2. a compound

  3. a mixture

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

An alloy is a material composed of two or more metals or a metal and a nonmetal