Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

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

An alloy which does not contain copper is:

  1. solder

  2. bronze

  3. brass

  4. bell metal
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

Select the correct alternative for the preparation of steel:

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Element present in the stainless steel is ______________.

  1. Iron

  2. Chromium

  3. Nickel

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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.

  1. a, b

  2. c, d

  3. a, c

  4. b, d
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following alloy contains mercury?

  1. Bronze

  2. Zinc amalgam

  3. Brass

  4. German silver
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Identify the alloy which does not contain zinc metal.

  1. Gun metal

  2. German silver

  3. Brass

  4. Bronze
Reveal answer Fill a bubble to check yourself
D Correct answer
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 $Sn$