Question

Name of alloys are given in list – A. Match them with their constituents given in list – B and uses given in list – C.

List - A	List - B	List - C
A. Stainless steel	a. Iron + nickel + aluminium + cobalt	i. Electrical contact part.
B. Alnico	b. Iron + carbon + chromium + nickel	ii. Sports medal
C. Invar steel	c. Copper + zinc + tin	iii. Surgical instruments
D. Brass	d. Iron + carbon + nickel (large quantity)	iv. Aeroplane body
	e. Aluminium + copper + magnesium + manganese	v. Permanent magnets
	f. Copper + zinc	vi. Precision measuring instruments

Answer 1

Hint: To solve this we have to remember the constituents of the alloys and why are they used. Every alloy has a different use due to the different properties it exhibits on forming a mixture of metals.

Complete step by step solution: To solve this let us discuss the alloys given in the list A and its constituents and uses and then we can match them.
Firstly, we have stainless steel.
-Stainless steel is an iron-based alloy. It contains around 11% chromium which prevents it from rusting and provides heat-resistant properties. It also contains 0.03 to 1% carbon. Different types of stainless steels contain copper, nickel, silicon, molybdenum etc. However, most commonly it contains nickel which provides its mechanical strength and improves resistance towards corrosion.
-It is used for making surgical instruments due to its strength and resistance towards corrosion.
Then we have alnico.
-Alnico is also an iron-based alloy. It contains around 8-12% aluminium, 15-26% nickel, 5-24% cobalt which are the main constituents. Besides these elements, it also contains 1% titanium and 6% cobalt and the rest is iron. Its name is an acronym for aluminium (Al) + nickel (Ni) + cobalt (Co) thus the name alnico.
-Alnico alloys are ferromagnetic and are used for making permanent magnets.
Next, we have Invar steel.
-It is a nickel-iron alloy. It contains 36% nickel and 64% iron. It is notable for its low coefficient for temperature. It does not expand or contract with temperature change and thus the name invar comes from the term invariable.
-It is used where high dimensional stability is required like precision instruments, clocks etc.
Lastly, we have brass.
-It is an alloy of copper and zinc. Its proportions are varied depending upon the type of electrical and mechanical property we want to achieve.
-It is used for making electrical fitting and electrical contact parts.
Now that we have discussed we can accordingly match the alloys with its constituents and uses as-

List - A	List - B	List - C
A. Stainless steel	b. Iron + carbon + chromium + nickel	iii. Surgical instruments
B. Alnico	a. Iron + nickel + aluminium + cobalt	v. Permanent magnets
C. Invar steel	d. Iron + carbon + nickel (large quantity)	vi. Precision measuring instruments
D. Brass	f. Copper + zinc	i. Electrical contact part.

This is our required answer.

Note: An alloy is a mixture of metal or nonmetal of one or more than one elements. However, the properties of the resulting mixture are quite different from the pure metal used like its strength and hardness. An alloy generally retains all the properties of a metal-like conductivity of electricity, its opaque surface, malleability and ductility and lustre. Alloys are of great use all over the world due to its increased strength and greater longevity.