Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 14

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Weekly Quiz Competition

Question 1

1 / -0

Use the following information to answer the next question.

Crude petroleum oil is a complex mixture of organic liquids that occurs naturally beneath Earth’s surface. It was formed millions of years ago. Crude oil is vaporized and made to undergo fractional distillation where its components get separated as shown in the figure.

The organic liquids present in crude oil are separated in a fractional distillation chamber because they have different

melting points

densities

boiling points

viscosities

Solution

Crude oil is vaporized in a furnace where its constituents get separated according to their boiling points.

The correct answer is C.

Why alternative A is wrong:

The components of crude oil exist in the liquid state. Their melting points are much below the normal room temperature. Crude oil is vaporized by heating before passing it through the fractional distillation chamber. Hence, the differences in their boiling points are used for separating organic liquids, not melting points.

Why alternative B is wrong:

In order to separate the components of crude oil, it has to be left for a long time in a stationary container. This method consumes a lot of time. Hence, this method is not used for separating organic liquids from crude oil.

Why alternative D is wrong:

Difference in viscosity cannot be used for efficiently separating different organic fluids from crude oil.

Question 2
1 / -0

Which of the following materials consists of a single type of atoms?

A
Brass

B
Steel

C
Duralumin

D
Aluminum

Solution

Aluminium is a pure metal whereas all the other materials given above are alloys i.e. mixtures of two or more metals.

The correct answer is D.
Question 3
1 / -0

Use the following information to answer the next question.

Matter is made up of tiny particles. Though it can be broken into smaller particles, a stage comes when further division is not possible.

The unbreakable tiny particle of matter is called

A
a molecule

B
an element

C
an atom

D
a compound

Solution

Atoms are the building blocks of matter. They cannot be further broken down into smaller pieces by using physical or chemical processes.

The correct answer is C.
Question 4
1 / -0

Use the following information to answer the next question.

The alloy of copper and zinc is known as and the alloy of carbon and iron is known as.

Which alternative completes the above statement?

A

I II

Brass Steel

B

I II

Bronze Steel

C

I II

Bronze Brass

D

I II

Steel Brass

Solution

Brass is an alloy of copper and zinc whereas steel is an alloy of iron and carbon.

The correct answer is A.

Question 5

1 / -0

Use the following information to answer the next question.

A piece of ice was taken in a closed conical flask and weighed. The flask was then kept at room temperature to melt the ice into water and was weighed again. It was found that there was no change in the weight of the flask, although a physical change had occurred.

During the melting of ice to form water, the number of atoms

decrease to half of the original volume.

neither decrease nor increase.

increase to double of the original volume.

decreased to one fourth of the original volume.

Solution

The conversion of ice to water was carried out in a closed container and in the conversion of state, the number of atoms remains same. Therefore, the number of atoms neither decrease nor increase.

The correct answer is B.

Question 6
1 / -0

A chemical compound is composed of

A
a single atom

B
a single molecule

C
different atoms

D
different molecules

Solution

Two or more atoms of different elements joined together to form a chemical

compound.

Hence, the correct answer is option C.

Question 7

1 / -0

Use the following information to answer the next question.

Cryolite occurs in nature in the form of glassy and colourless monoclinic crystals. It is used in the electrolytic processing of the aluminum-rich oxide ore. The chemical formula of cryolite is Na₃AlF₆.

Cryolite can be classified as

an element

a compound

a mixture

a solvent

Solution

Cryolite contains sodium (Na), aluminium (Al), and fluorine (F). Since it is a combination of three elements, it is a compound.

The correct answer is B.

Question 8
1 / -0

Use the following information to answer the next question.

Hydrochloric acid (HCl) is present in the stomach of human beings.

Hydrochloric acid is

A
a colloid

B
a compound

C
an element

D
a mixture

Solution

Hydrochloric acid is formed by the reaction of hydrogen andchlorine. It is a compound of two elements.

The correct answer is B.
Question 9
1 / -0

Use the following information to answer the next question.

Blue vitriol is a solution whose chemical formula is CuSO₄.5H₂O

Blue vitriol can be classified as

A
an element

B
a compound

C
a mixture

D
a solvent

Solution

Blue vitriol contains more than one element namely copper, sulfur, and oxygen. Hence, it can be classified as a compound.

The correct answer is B.
Question 10
1 / -0

Use the following information to answer the next question.

The common name of mercury is quicksilver.

What is quicksilver?

A
An element

B
A mixture

C
An atom

D
A compound

Solution

Mercury is a d-block transition element. It is stable in the free state. Hence, it is an element.

The correct answer is A.

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I	II
Brass	Steel

I	II
Bronze	Steel

I	II
Bronze	Brass

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Steel	Brass

Is Matter Around Us Pure Test - 14

Result

Is Matter Around Us Pure Test - 14

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SHARING IS CARING

Question 1

melting points

densities

boiling points

viscosities

Solution

Question 2

Brass

Steel

Duralumin

Aluminum

Solution

Question 3

a molecule

an element

an atom

a compound

Solution

Question 4

I II Brass Steel

I II Bronze Steel

I II Bronze Brass

I II Steel Brass

Solution

Question 5

decrease to half of the original volume.

neither decrease nor increase.

increase to double of the original volume.

decreased to one fourth of the original volume.

Solution

Question 6

a single atom

a single molecule

different atoms

different molecules

Solution

Question 7

an element

a compound

a mixture

a solvent

Solution

Question 8

a colloid

a compound

an element

a mixture

Solution

Question 9

an element

a compound

a mixture

a solvent

Solution

Question 10

An element

A mixture

An atom

A compound

Solution

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I II

Brass Steel

I II

Bronze Steel

I II

Bronze Brass

I II

Steel Brass