Atoms and Molecules Test

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Atoms and Molecules Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

The laws of chemical combination formed on the basis of :

A
Dalton's atomic theory

B
Dalton's mass theory

C
Both A and B

D
None of the above

Solution

Before Dalton, the concept of the atom was not concrete. Dalton explained atoms based on the laws of chemical combinations. When substances react, they do so by following certain laws. These laws are called the laws of chemical combination. These laws formed the basis of Dalton's atomic theory.
Question 2
1 / -0

Atoms are:

A
indivisible

B
divisible

C
may be divisible

D
None of the above
Question 3
1 / -0

Avogadro number is equal to:

A
$$6.023\times10^{21}$$

B
$$6.023\times10^{22}$$

C
$$6.023\times10^{23}$$

D
$$6.023\times10^{24}$$
Question 4
1 / -0

Definition of anion is :

A
Negatively charged ion

B
Positively charged ion

C
Neutral ion

D
None of the above

Solution

Ions are atoms or molecules that have an electrical charge. Ions can have either a positive or negative charge, and ions with a negative charge are known as $$anions.$$
Option (A) is correct.
Question 5
1 / -0

The discovery of __________ proved that atom is divisible.

A
atoms

B
sub-atomic particles

C
elements

D
isotope

Solution

The discovery of sub-atomic particles proved that atom is divisible and can be divides in to smaller particles.
Question 6
1 / -0

_____ are the basic units of matter and the defining structure of elements.

A
Compounds

B
Atoms

C
Ions

D
None of these

Solution

The matter is made up of tiny particles called atoms. This is the basic unit of matter, present in every element as a fundamental unit.
So, option B is correct.
Question 7
1 / -0

........... are made up of atoms that are held together by chemical bonds.

A
Elements

B
Molecules

C
Mixtures

D
Both A and B

Solution

Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among the atoms.
Question 8
1 / -0

According to Dalton, atoms of different elements combine with one another to form:

A
compounds

B
elements

C
solution

D
All of the above

Solution

According to Dalton, atoms of different elements combine with one another to form compounds.
For example; $$H + Cl \rightarrow HCl$$
Question 9
1 / -0

When atoms of one element are combined with atoms of another element, the result is a(n) _________ of a compound.

A
electron

B
ion

C
molecule

D
enzyme

Solution

When atoms of one element are combined with atoms of another element, the result is a molecule of a compound. For example, a $$C$$ atom combines with an $$O$$ atom to form a $$CO$$ molecule. Thus, a compound is obtained by a combination of atoms of different elements.
Question 10
1 / -0

Identify diatomic molecule from the following.

A
Hydrogen

B
Chlorine

C
Fluorine

D
All of these

Solution

A diatomic molecule is a molecule composed of two atoms. Hydrogen ($$H_2$$), chlorine($$Cl_2$$), and fluorine($$F_2$$) are the elements that occur naturally in diatomic form. Hence option D is correct.

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Atoms and Molecules Test - 23

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Atoms and Molecules Test - 23

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Question 1

Dalton's atomic theory

Dalton's mass theory

Both A and B

None of the above

Solution

Question 2

indivisible

divisible

may be divisible

None of the above

Question 3

$$6.023\times10^{21}$$

$$6.023\times10^{22}$$

$$6.023\times10^{23}$$

$$6.023\times10^{24}$$

Question 4

Negatively charged ion

Positively charged ion

Neutral ion

None of the above

Solution

Question 5

atoms

sub-atomic particles

elements

isotope

Solution

Question 6

Compounds

Atoms

Ions

None of these

Solution

Question 7

Elements

Molecules

Mixtures

Both A and B

Solution

Question 8

compounds

elements

solution

All of the above

Solution

Question 9

electron

ion

molecule

enzyme

Solution

Question 10

Hydrogen

Chlorine

Fluorine

All of these

Solution

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