Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

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.

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

Identify the alloy containing a non- metal as a constituent in it.

  1. Bell metal

  2. Bronze

  3. Invar

  4. Steel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Steel is an alloy primarily composed of iron and carbon, where carbon is a non-metal. The other options, bell metal, bronze, and invar, are alloys consisting solely of metallic elements like copper, tin, nickel, and iron.

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

An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge wares and gold is resent at a body centre. the alloy has a formula?

  1. $ Cu _{4}Ag _{2}Au $
  2. $ Cu _{4}Ag _{4}Au $
  3. $ Cu _{4}Ag _{3}Au $

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

In a ccp lattice, Cu atoms at corners and faces give 4 atoms per unit cell. Silver atoms at edge centers (12 edges * 1/4 = 3 atoms). Gold at body center (1 atom). Formula: Cu4Ag3Au.

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

Which of the following is an alloy?

  1. Silver

  2. Gallium
  3. $22$ carat gold
  4. $24$ carat gold
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

22 karat gold contains 22 parts gold and 2 parts of other metals added as alloy. ... 18 karat gold contains 18 parts pure gold with 6 parts of other metals added. In the West the karat is expressed in fineness.

Hence 22 carat gold is an alloy.