Tag: chemical bonding and structure

Quizzes (8) Questions (141)

Questions Related to chemical bonding and structure

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

State whether true or false :

Cars are made from steel which is an alloy of carbon and aluminium.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The most common material used in building cars is Steel because it is strong, easy to work with, cheap, readily available and almost every car will have some steel in it. 


It can be used for parts like the roof, chassis, wheels, brakes, exhaust and engine. It doesn’t take extremely specialised tools or knowledge to produce, manufacture and repair steel so is the cheapest metal used in car building.


But steel is an alloy of iron and carbon and not aluminium and carbon.
Statement is false.

Option B is correct.

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

Steel is heated to the very high temperature and then plunged into cold water. This process is called _______.

  1. tempering

  2. anodising

  3. regulating

  4. anealing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Annealing is the process of heating the steel to high temperature to soften it and it undergoes three phases. Quenching involves heating the steel and tempering in water or oil. This rapid cooling results in hard and brittle steel.

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

An alloy is :

  1. an element

  2. a compound

  3. a homogeneous mixture

  4. a heterogeneous mixture
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An alloy is a homogeneous mixture of two or more metals in a definite proportion. 


The alloy is made by mixing a metal in the molten state with another metal and then solidified.

Hence the correct option is C.