Tag: alloys and their properties

Questions Related to alloys and their properties

Ornamental gold is an alloy of gold and silver.

chemistry chemical bonding and structure alloys and their properties metals, alloys and crystals elements and compounds

  1. True

  2. False

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Correct Option: A
Explanation:

Gold as pure metal is too soft on its own and is therefore hardened by the addition of alloying element like silver for ornamental purpose.
option A is correct.

Which of the following pair of elements form alloy?

chemistry chemical bonding and structure alloys and their properties metals, alloys and crystals elements and compounds

  1. $Zn$ and $Pb$

  2. $Fe$ and $C$

  3. $Hg$ and $Ag$

  4. All of these

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Correct Option: D
Explanation:
Alloys are formed by metals whose atomic radii not differ by more than $15 \%$ so that the atoms of one metal can easily take up the positions in the crystal lattice of the other.
Thus all of these will be the correct answer.

The mixture of two or more metals is called a/an _______ .

chemistry chemical bonding and structure alloys and their properties metals, alloys and crystals elements and compounds

  1. solder

  2. mixture

  3. alloy

  4. amalgam

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Correct Option: C
Explanation:

The mix of two or more metals is called an alloy. the various properties of metals can be unproved by mixing two or more metals.

The alloy steel used for making automobile parts and utensils is called

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. nickel steel

  2. stainless steel

  3. tungsten steel

  4. chromium steel

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Correct Option: A

An alloy which does not contain copper is:

chemistry chemical bonding and structure alloys and their properties metals, alloys and crystals elements and compounds

  1. solder

  2. bronze

  3. brass

  4. bell metal

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Correct Option: A
Explanation:

Solder- an alloy of tin $(Sn)$ and lead $(Pb)$
Bronze-an alloy of copper $(Cu)$ and tin $(Sn)$
Brass-an alloy of copper $(Cu)$ and Zinc $(Zn)$
Bell metal-an alloy of copper $(Cu)$ and tin $(Sn)$
Therefore option A is correct

Select the correct alternative for the preparation of steel:

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. A - coal, B- limestone, C - iron ore

  2. A - coal, B - iron ore , C -limestone

  3. A - limestone, B - coal , C - iron ore

  4. A - iron ore, B -limestone , C - coal

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Correct Option: D
Explanation:

Making iron is the first step of production of steel. Iron is usually made from iron ore,limestone and coal. Limestone is added to iron before entering the blast furnace. The limestone reacts with acidic impurities called slag and floats on top of the molten iron where it is skimmed off.

Element present in the stainless steel is ______________.

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Iron

  2. Chromium

  3. Nickel

  4. All of these

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Correct Option: D
Explanation:

Stainless steel also known as inox steel. It is an alloy of steel (Iron and nickel) with chromium 10.5%. It does not corrode readily, rust or stain. There are different grades of stainless steel. It is used where both the properties of steel and corrosion resistance are required.

Mark the incorrect statement.
a) Alloys with required properties can be made.
b) Alloys have properties different from constituent metals.
c) Alloys can never have carbon in it.
d) Alloy is a heterogenous mixture.

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. a, b

  2. c, d

  3. a, c

  4. b, d

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Correct Option: B
Explanation:

Alloys have properties which can different from the constituent metals. In fact it is possible to make alloys having required properties.

Alloy is a homogeneous mixture. Steel is an alloy of iron and carbon.

Which of the following alloy contains mercury?

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Bronze

  2. Zinc amalgam

  3. Brass

  4. German silver

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Correct Option: B
Explanation:

Amalgam is a substance formed by the reaction of mercury with another metal.Almost all metals form amalgams with mercury with exceptions being iron,platinum,tungsten and tantalum.Silver-mercury amalgams are important in dentistry.

Identify the alloy which does not contain zinc metal.

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Gun metal

  2. German silver

  3. Brass

  4. Bronze

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Correct Option: D
Explanation:

Bronze is an alloy of $Cu$ and $Sn$. It does not contain zinc metal.

Alloy                                 Metals present
Gun metal $Cu$ (88%) $Sn$ (10%) $Zn$ (2%)
German silver $Cu,\ Zn$ and $Ni$
Brass $Cu$ and $Zn$
Bronze $Cu$ and $Sn$