Elements, Compounds, Symbols and Formulae Test

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Elements, Compounds, Symbols and Formulae Test - 1

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Weekly Quiz Competition

Question 1
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Substances that are made up of the same kind of particles (atoms) are known as

A
elements

B
compounds

C
elements or mixtures

D
compounds or mixtures

Solution

Elements are substances that are made up of identical particles. These identical particles are known as atoms.

The correct answer is A.

Why alternative B is wrong:

Compounds are substances that are made up of two or more elements.

Why alternative C is wrong:

Elements are made up of identical particles but mixtures are made up of two or more elements or compounds.

Why alternative D is wrong:

Neither compounds nor mixtures are made up of identical particles.
Question 2
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Which of the following elements is a metal?

A
Sodium

B
Phosphorus

C
Oxygen

D
Iodine

Solution

A substance is classified as a metal if it is hard, lustrous, malleable, and a good conductor of heat and electricity. Though sodium is soft, it is malleable having a silvery luster. It is also a very good conductor of heat and electricity. Thus, sodium is a metal.
Question 3
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Which of the following properties is not a general property of metals?

A
Metals are soft

B
Metals are ductile

C
Metals are sonorous

D
Metals are malleable

Solution

Metals are usually hard. However, there are a few exceptions such as metals like sodium are potassium, which are soft and can be cut with a knife. On the other hand, mercury is the only metal, which is found in the liquid state at room temperature.
Question 4
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Use the following information to answer the next question.

Element Compound

Titanium Chalk

Mercury Sugar

Methane Ammonia

Which substance is listed incorrectly in the given table?

A
Chalk

B
Sugar

C
Methane

D
Titanium

Solution

A compound is a substance formed by the combination of two or more elements. The molecular formula of methane is CH₄. Methane is a compound containing one carbon atom and four hydrogen atoms. Hence, it is listed incorrectly in the given table.

The correct answer is C.

Why alternative A is wrong:

Chalk is a chemical compound containing calcium, carbon, and oxygen.

Why alternative B is wrong:

Sugar is a chemical compound made up of 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

Why alternative D is wrong:

Titanium is an element.
Question 5
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Which of the following elements has four atoms in its molecule?

A
Lead

B
Carbon

C
Copper

D
Phosphorous

Solution

The number of atoms constituting a molecule is known as atomicity. Phosphorous has four atoms in a molecule i.e., it is tetra-atomic.

Lead and copper are metals and they exist as aggregate of the atoms. Carbon exists in nature in many forms such as graphite and diamond.

The correct answer is D.
Question 6
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Which of the following examples is not a mixture?

A
Diet soda

B
Salt and water

C
Sand and water

D
Sodium chloride

Solution

Sodium chloride is a compound. It contains sodium and chlorine as constituent elements in fixed proportions.

The correct answer is D.

Why alternative A is wrong:

Diet soda contains carbon dioxide and sugar in dissolved form. Hence, it is a mixture.

Why alternative B is wrong:

Salt dissolves in water to form salt solution, which is a mixture.

Why alternative C is wrong:

Though sand does not dissolve in water, it mixes with water to form a mixture.
Question 7
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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.
Question 8
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Compounds are substances made up of two or more elements combined in specific proportions. The elements that are present in sugar are

A
carbon, sulphur, and oxygen

B
carbon, hydrogen, and nitrogen

C
carbon, nitrogen, and oxygen

D
carbon, hydrogen, and oxygen

Solution

Sugar is a complex compound made up of carbon, hydrogen, and oxygen.
Question 9
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Which of the following elements exists as a monatomic molecule?

A
Hydrogen

B
Nitrogen

C
Oxygen

D
Boron

Solution

Boron is located on the top 13^th group of the periodic table, which lies in the middle of a period, and is chemically inert to almost all of the other elements. Hence, boron exists as a monatomic molecule.

The correct answer is D.

Why alternative A is wrong:

Hydrogen is the first element in the periodic table. It lies in the first period and in the first group. It is very reactive and hence, cannot occur as a monatomic molecule.

Why alternative B is wrong:

Nitrogen is in the 15^th group of the second period of the periodic table. It is a reactive non-metal and cannot occur as a monatomic molecule.

Why alternative C is wrong:

Oxygen is in the 16^th group of the second period of the periodic table. It is a very reactive non-metal and cannot occur as a monatomic molecule.
Question 10
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Which of the following statements regarding elements is true?

A
Elements are made up of different types of atoms.

B
Elements can be further subdivided into smaller particles by ordinary chemical means.

C
Elements are made up of at least two types of atoms.

D
Elements cannot be further subdivided into smaller particles by ordinary chemical means.

Solution

Elements are the purest form of matter and contain only one type of atoms. Elements cannot be further subdivided into smaller particles by ordinary chemical means.

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Element	Compound
Titanium	Chalk
Mercury	Sugar
Methane	Ammonia

Elements, Compounds, Symbols and Formulae Test - 1

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Elements, Compounds, Symbols and Formulae Test - 1

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Question 1

elements

compounds

elements or mixtures

compounds or mixtures

Solution

Question 2

Sodium

Phosphorus

Oxygen

Iodine

Solution

Question 3

Metals are soft

Metals are ductile

Metals are sonorous

Metals are malleable

Solution

Question 4

Chalk

Sugar

Methane

Titanium

Solution

Question 5

Lead

Carbon

Copper

Phosphorous

Solution

Question 6

Diet soda

Salt and water

Sand and water

Sodium chloride

Solution

Question 7

a single atom

a single molecule

different atoms

different molecules

Solution

Question 8

carbon, sulphur, and oxygen

carbon, hydrogen, and nitrogen

carbon, nitrogen, and oxygen

carbon, hydrogen, and oxygen

Solution

Question 9

Hydrogen

Nitrogen

Oxygen

Boron

Solution

Question 10

Elements are made up of different types of atoms.

Elements can be further subdivided into smaller particles by ordinary chemical means.

Elements are made up of at least two types of atoms.

Elements cannot be further subdivided into smaller particles by ordinary chemical means.

Solution

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