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Chapter 8: Problem 25

Match the entries in column-A with appropriate ones in column-B. Column A \(\quad\) Column (1) German silver () (a) for making printing type (2) Tungsten steel () (b) soldering (3) Alloy of \(\mathrm{Sn}\) and () (c) for making high speed \(\mathrm{Pb} \quad\) tolls (4) Alloy of \(\mathrm{Pb}\), \(\mathrm{Sn}\) () (d) for making jewellery and \(\mathrm{Sb}\)

Short Answer

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Question: Match the alloys in Column A with their appropriate uses in Column B. Column A: 1. German silver 2. Tungsten steel 3. Alloy of \(\mathrm{Sn}\) (Tin) and \(\mathrm{Pb}\) (Lead) 4. Alloy of \(\mathrm{Pb}\) (Lead), \(\mathrm{Sn}\) (Tin), and \(\mathrm{Sb}\) (Antimony) Column B: (a) For making printing type (b) Soldering (c) For making high-speed tools (d) For making jewellery Answer: 1 - (d) 2 - (c) 3 - (b) 4 - (a)

Step by step solution

01

Identify the alloys in column A

Learn about the different alloys listed in Column A and their composition: 1. German silver: An alloy of Copper, Nickel, and Zinc. 2. Tungsten steel: An alloy of Iron and Tungsten. 3. Alloy of \(\mathrm{Sn}\) (Tin) and \(\mathrm{Pb}\) (Lead). 4. Alloy of \(\mathrm{Pb}\) (Lead), \(\mathrm{Sn}\) (Tin), and \(\mathrm{Sb}\) (Antimony).
02

Identify the uses of alloys in column B

Read the descriptions of the uses of alloys listed in Column B and understand them: (a) For making printing type (b) Soldering (c) For making high-speed tools (d) For making jewellery
03

Match alloys with appropriate uses

Compare the properties of each alloy in Column A with the descriptions in Column B, then make the correct match: (1) German silver - (d) For making jewellery: German silver, made of Copper, Nickel, and Zinc, is used for making jewellery due to its silver-like appearance. (2) Tungsten steel - (c) For making high-speed tools: Tungsten steel, made of Iron and Tungsten, is used for making high-speed tools because it is strong and durable. (3) Alloy of \(\mathrm{Sn}\) (Tin) and \(\mathrm{Pb}\) (Lead) - (b) Soldering: Tin and Lead alloy, known as solder, is used for soldering electronic components due to its low melting point. (4) Alloy of \(\mathrm{Pb}\) (Lead), \(\mathrm{Sn}\) (Tin), and \(\mathrm{Sb}\) (Antimony) - (a) For making printing type: This alloy, known as type metal, has been traditionally used for making printing type because of its suitable hardness and low melting point. After completing the matching exercise, the final result is: Column A \(\quad\) Column B (1) German silver (d) For making jewellery (2) Tungsten steel (c) For making high-speed tools (3) Alloy of \(\mathrm{Sn}\) and (b) Soldering \(\mathrm{Pb}\quad\) (4) Alloy of \(\mathrm{Pb}\), \(\mathrm{Sn}\) (a) For making printing type and \(\mathrm{Sb}\)

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Properties of Alloys
Alloys are materials composed of two or more metals, or a metal and a non-metal, mixed together to achieve certain desired properties. These new materials are designed to impart advantages over their individual components, such as increased strength, resistance to corrosion, improved malleability, or changes in melting point.

For instance, the alloy known as German silver, despite its name, contains no actual silver but is an alloy of copper, nickel, and zinc. This combination gives it a silver-like appearance while offering enhanced durability and resistance to tarnishing, which makes it suitable for creating jewellery that is both attractive and long-lasting.

An alloy's properties can be tailored by adjusting the type and amount of elements mixed, thus providing an extensive range of possibilities for different applications.
Metal Alloys in Chemistry
In chemistry, metal alloys play a pivotal role due to their versatile characteristics and the ability to design them for specific uses. Understanding the composition and structure of alloys is crucial. The structure of an alloy—whether it's a solid solution, intermetallic compound, or a mix—determines its properties.

For example, tungsten steel, an iron-based alloy with tungsten, is renowned for its exceptional hardness and high melting point, which are essential for the production of high-speed tools. The precision of chemistry allows us to create specific alloys like solder, made of tin and lead, that have a low melting point ideal for applications like soldering, where controlled melting and solidification are necessary.
Applications of Alloys
Alloys are fundamental to various industries due to their specialized properties. The application of alloys is widespread, ranging from everyday objects to specialized tools.

  • German silver is often used in the manufacture of musical instruments and jewellery.
  • Tungsten steel's durability makes it suitable for cutting and drilling equipment.
  • Solder, an alloy of tin and lead, is indispensable in electronics for joining components.
  • Type metal, an alloy of lead, tin, and antimony, has historically been used to make the type used in printing presses.

This versatility and adaptability make the study and use of alloys a crucial part of material science and engineering.

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Most popular questions from this chapter

Equal masses of iron and sulphur are heated together to form FeS. What fraction of the original mass of excess reactant is left unreacted? \((\mathrm{Fe}=56\), \(\mathrm{S}=32\) ) (a) \(0.22\) (b) \(0.43\) (c) \(0.86\) (d) \(0.57\)

One mole of a mixture of \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\) requires exactly \(20 \mathrm{~g}\) of \(\mathrm{NaOH}\) in solution for complete conversion of all the \(\mathrm{CO}_{2}\) into \(\mathrm{Na}_{2} \mathrm{CO}_{3} .\) How many grams more of \(\mathrm{NaOH}\) would it require for conversion into \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) if the mixture (one mole) is completely oxidized to \(\mathrm{CO}_{2} ?\) (a) \(60 \mathrm{~g}\) (b) \(80 \mathrm{~g}\) (c) \(40 \mathrm{~g}\) (d) \(20 \mathrm{~g}\)

A power company burns approximately 500 tons of coal per day to produce electricity. If the sulphur content of the coal is \(1.5 \%\), by mass, how many tons \(\mathrm{SO}_{2}\) are dumped into the atmosphere, every day? (a) \(15.0\) (b) \(7.5\) (c) \(30.0\) (d) \(18.75\)

A volume \(V\) of a gaseous hydrocarbon was exploded with an excess of oxygen. The observed contraction was \(2.5 \mathrm{~V}\), and on treatment with potash, there was a further contraction of \(2 V\). What is the molecular formula of the hydrocarbon? (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{6}\) (c) \(\mathrm{C}_{4} \mathrm{H}_{12}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{4}\)

An amount of 6 moles of Cl-atoms at STP occupies a volume of (a) \(134.41\) (b) \(67.21\) (c) \(68.11\) (d) \(136.21\)
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