Questions & Answers
Question
AnswersBronze is an alloy of copper, zinc and tin.
A.True
B. False
Answer
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Hint:The alloy bronze contains primarily copper and tin but also mixed with some other metals like aluminium, manganese, nickel or zinc in order to increase its properties such as hardness, stiffness, etc.
Complete answer:
An alloy is defined as the homogenous mixture of two or more metals, or a metal and a nonmetal. It can be easily prepared by melting of primary metal followed by dissolving of the other elements in it in definite proportions. Finally, it is then cooled to room temperature. For example iron is not generally used in its pure form because pure iron is soft and can be stretched easily when it becomes hot. So, in order to make iron articles strong and hard, it is mixed with a small amount of carbon of about \[0.04\% \] . Similarly, when iron is mixed with chromium and nickel, the substance produced is hard and does not rust, and known as stainless steel. Thus, alloying of a metal is a very good method of improving the properties of a metal as properties of a metal can be changed if it is mixed with some other substance.
Some examples of alloy are as follow:
Thus, the correct option is A.
Note:
In order to make gold ornaments, gold is never used in its pure form for being very soft. To make gold jewelry, gold is alloyed with metal like silver or copper which makes it hard. 24 carat gold is known as pure gold and 22 carat gold means 22 parts of pure gold is alloyed with 2 parts of either silver or copper.
Complete answer:
An alloy is defined as the homogenous mixture of two or more metals, or a metal and a nonmetal. It can be easily prepared by melting of primary metal followed by dissolving of the other elements in it in definite proportions. Finally, it is then cooled to room temperature. For example iron is not generally used in its pure form because pure iron is soft and can be stretched easily when it becomes hot. So, in order to make iron articles strong and hard, it is mixed with a small amount of carbon of about \[0.04\% \] . Similarly, when iron is mixed with chromium and nickel, the substance produced is hard and does not rust, and known as stainless steel. Thus, alloying of a metal is a very good method of improving the properties of a metal as properties of a metal can be changed if it is mixed with some other substance.
Some examples of alloy are as follow:
| Name of alloy | Composition of the alloy | Uses of the alloy |
| Brass | Copper and zinc | In inexpensive jewellery, hose nozzles and couplings, stamping dies. |
| Bronze | Mainly copper with zinc and tin | In manufacturing of coins and medals, heavy gears, electrical hardware |
| Duralumin | Mainly aluminium with copper, manganese and magnesium | In automobiles and machinery |
| Solder metal | Lead and tin | In joining two metals to each other |
| Sterling silver | Mainly silver with copper | In jewelry and art objects |
Thus, the correct option is A.
Note:
In order to make gold ornaments, gold is never used in its pure form for being very soft. To make gold jewelry, gold is alloyed with metal like silver or copper which makes it hard. 24 carat gold is known as pure gold and 22 carat gold means 22 parts of pure gold is alloyed with 2 parts of either silver or copper.
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