Atomic Structure Test

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Atomic Structure Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following substances consists of atoms of same type?

A
Molecule

B
Compounds

C
Elements

D
Mixtures
Question 2
1 / -0

Mass number is the sum of ________ and ________ present in an atom.

A
protons and electrons

B
electrons, neutrons and protons

C
protons and neutrons

D
electrons and neutrons
Question 3
1 / -0

Number of atoms present in the molecule of an element is known as ________ of an element.

A
valency

B
atomic number

C
atomicity

D
mass number
Question 4
1 / -0

Which of the following is a substance which is made up of atoms of two or more than two different types of elements, when combined together chemically?

A
Iron

B
Diamond

C
Lime water

D
Graphite

Solution

A compound is formed by the chemical combination of two or more elements in a fixed proportion by mass.
Among the listed substances limewater (Calcium hydroxide; Ca(OH)₂) is a compound.
The constituent elements are calcium, hydrogen and oxygen.
Question 5
1 / -0

Which of the following is a molecule of an element?

A
Water

B
Ozone

C
Salt

D
Sugar
Question 6
1 / -0

Components of which of the following can be separated most easily?

A
Atom

B
Molecule

C
Compound

D
Mixture
Question 7
1 / -0

Which of the following particles are present inside the nucleus of an atom?

(i) Protons
(ii) Neutrons
(iii) Electrons

A
(i) and (ii)

B
(ii)

C
(ii) and (iii)

D
(i)

Solution

Protons and neutrons are present inside the nucleus, collectively known as nucleons whereas electrons are present outside the nucleus and revolve around the nucleus in fixed energy shells called orbits.
Question 8
1 / -0

Under which of the following categories would you classify metalloids?

A
Element

B
Compound

C
Molecule

D
Mixture

Solution

Metalloids are categories under elements.
Question 9
1 / -0

In nitrogen atom seven electrons are present. What is the atomic number of nitrogen?

A
7

B
14

C
8

D
16
Question 10
1 / -0

In which of the following elements, atoms exist independently?

A
Hydrogen

B
Nitrogen

C
Helium

D
Oxygen
Question 11
1 / -0

Which of the following elements has the maximum atomicity?

A
Phosphorus

B
Sulphur

C
Hydrogen

D
Ozone
Question 12
1 / -0

Which of the following statements is not true with regard to matter?

A
Atom is electrically neutral.

B
Atoms can not exist independently.

C
Atom can be divided into smaller particles.

D
Atoms combine to form molecule.

Solution

Atoms generally combine to form molecules, however atoms of noble gases can exist independently.
Hence, the statement in option (2) is incorrect.
Question 13
1 / -0

The atomic number of an element is 11 and its mass number is 23. How many neutrons are present in the atom?

A
11

B
12

C
22

D
23

Solution

The number of protons = atomic number (Z) = 11
Atomic mass (A) = Number of protons + Number of neutrons
23 = 11 + number of neutrons
Number of neutrons = 23 - 11 = 12
Question 14
1 / -0

Which of the following statements is true regarding the sub atomic particles of matter?

A
In an atom, number of protons is always equal to the number of electrons.

B
In an atom, number of protons is always equal to the number of neutrons.

C
In an atom, number of protons is always more than the number of neutrons.

D
In an atom, number of neutrons is always more than the number of electrons.

Solution

In an atom, number of protons is always equal to the number of electrons, hence atom is an electrically neutral particle.
Question 15
1 / -0

Radius of hydrogen atom is of the order of _______ .

A
1 nm

B
0.529 A

C
1 cm

D
0.1 A

Solution

According to Bohr's formula for the radius of an atom:

For the Hydrogen atom, Z = 1, n = 1
Hence, r = 0.529
Question 16
1 / -0

Which of the following pairs forms an electrically neutral atom?

A
Proton and neutron

B
Proton and electron

C
Neutron and electron

D
Nucleus and electron

Solution

The charge on a proton and electron is equal in magnitude and opposite in nature. This is the reason that an atom is a neutral particle as the number of protons in an atom is equal is equal to the number of electrons.
Hence, option (2) is correct.
Question 17
1 / -0

Atomic number of Cl is 17. How many protons are present in it?

A
34

B
7

C
17

D
0

Solution

The atomic number of an element is the number of protons present in the nucleus of the atom. Hence, the number of protons in a Chlorine atom is 17.
Question 18
1 / -0

Isotopes of an element differ in the number of

A
protons

B
electrons

C
neutrons

D
nucleons

Solution

Isotopes are atoms of the same element (hence same atomic number) having different mass numbers due to difference in the number of neutrons in the nucleus.
Hence, option (3) is correct.
Question 19
1 / -0

Tritium is the isotope of H with number of neutrons, electrons & protons equal to _____ respectively.

A
0, 1, 1

B
2, 1, 1

C
0, 2, 2

D
1, 1, 2

Solution

Tritium:
Tritium is an isotope of hydrogen (Atomic number 1) with the mass number 3. It possesses, 2 neutrons, 1 proton and 1 electron.
Question 20
1 / -0

Charge on phosphate ion is

A
+4

B
+3

C
-1

D
-3

Solution

Phosphate ions is a group of atoms having 3 units of negative charge: