Question

Write any 8 objectives of making Alloy and explain types and preparation of Alloys .

Class - 10th
Chapter - Metals and Nonmetals.

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Answer 1

Answer:

Almost all metals are used as alloys—that is, mixtures of several elements—because these have properties superior to pure metals. Alloying is done for many reasons, typically to increase strength, increase corrosion resistance, or reduce costs.

Answer 2

Answer ::

$\;\large{\odot\;\;\;\underline{\underline{\bf{\green{Objectives\;of\;making\;Alloy}}}}}$

The following are the objectives of making Alloys :-

• Quality : Alloying improves the quality of parent metal. The reason because the parent metal can't be good in more than several things but when we mix it with other metals, its quality and nature can be improved for usage.

• Prevents Corrosion : We know that most of the metals are very reactive that is they react easily with atmospheric gases forming different compounds. When these metals are mixed with non metals to form alloys, their reactivity decreases thus they can be used easily for a long time without getting corroded.

• Increases Durability : Some metals are soft and less tensile in nature. They can be softly moulded into different shapes. When these metals are mixed with other metals like chromium, their durability increases which makes them more stronger.

• Prevents Oxidation : Most metals like Copper, Calcium, Iron,Silver,etc. get easily oxidised in presence of oxygen. But when they are mixed with non reactive non metals metals they overcome this situation and retain their metal.

• Low Cost : Pure metals are very fine thus very costly. Making alloys make them cheap thus easily available to poor people even when their quality is more improved.

• Reduces Weight : Pure or Parent Metals are heavy in their weight which makes them unavailable for more use. Instead alloys are light weighted and shiny in texture which increases their usage and appearance.

• Desired Properties : Usage of a metal depends on its properties. Pure metals have limited properties. Alloys can give us desired properties since we can mix any metal with certain property with parent metal to get desired properties.

• Increase in melting Point : We know that some lower group metals have high melting point. Thus when they are made alloys with Parent Metals, the melting point of alloys increases.

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$\;\large{\odot\;\;\;\underline{\underline{\bf{\blue{Types\;of\;Alloys}}}}}$

The following are the types of Alloys :-

• Metal - Metal Alloys : These are the alloys formed using two metals one is parent metal and one is primary metal which is mixed. For example : Solder (Leads and Tin)

• Metal - Non Metal Alloys : These are the types of alloys which are made using a metal and a non metal. For example : Steel (Iron and Carbon)

• Ferrous Alloys : These are the types of alloys where there is the mixing of Iron in the alloys in any form. This means either the Parent or Secondary Metal is Iron. For example : Stainless Steel (Iron, Carbon, Nickel, Chromium)

• Non - Ferrous Alloys : These are the types of alloys where there is no involvement of Iron in the formation that is neither Parent nor Primary Metal is Iron. For example : Brass (Copper and Zinc).

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$\;\large{\odot\;\;\;\underline{\underline{\bf{\orange{Preparation\;of\;Alloys}}}}}$

Alloys are prepared by the follow way :

First the Parent Metal or Primary Metal is melted at high temperature. Then the other Secondary Element (metal or non - metal) which is to be mixed is dissolved in that melted metal and mixed. After this the whole constituent is cooled at room temperature to attain the required Alloy.

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★ More to Know :-

~ Different Types of Alloys ::

• Amalgam - Mercury and other desired metal.

• Solder - Lead (Pb) and Tin (Sn)

• Bronze - Copper (Cu) and Tin (Sn)

~ Some reactions to know ::

$\;\;\sf{\red{\leadsto\;\;2Ag\;+\;SO_{2}\;\longrightarrow\;Ag_{2}S\;+\;O_{2}}}$

$\;\;\sf{\red{\leadsto\;\;Cu\;+\;CO_{2}\;+\;H_{2}O\;+\;O_{2}\;\longrightarrow\;CuCO_{3}\;.\;Cu(OH)_{2}}}$