Tag: chemistry

Questions Related to chemistry

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 $Sn$

Solder is an alloy of  ____________.

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

  1. $Cu+Zn$

  2. $Pb+Sn$

  3. $Pb+Sb$

  4. $Cu+Sn$

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Correct Option: B
Explanation:

Solder is an alloy of Sn and Pb which makes alloy with high corrosion resistance.

Zinc metal is used in galvanization.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten zinc.

An alloy is a _________ mixture of two or more metals, or a metal and a non-metal.
chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Heterogeneous

  2. Homogeneous

  3. Both A and B

  4. None of these

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Correct Option: B
Explanation:

An alloy is a homogenous mixture of two or more metals or non metals or nonmetals mixed in a molten state.