Atomic Structure Test

Result

Atomic Structure Test - 6

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements contradicts Dalton's atomic theory?

A
A chemical change involves rearrangement of atoms.

B
Atoms form ions by gain or loss of electrons.

C
The number of atoms may change when a substance changes from solid to gaseous state.

D
Total number of atoms during a chemical change remains unaltered.

Solution

The statement that contradicts Dalton's atomic theory is that atoms form ions by gain or loss of electrons.
Question 2
1 / -0

Canal ray experiment lead to the discovery of

A
protons

B
neutrons

C
electrons

D
nucleus

Solution

Canal ray experiment lead to the discovery of protons.
Question 3
1 / -0

The nucleus of deuterium contains

A
1 proton and 2 neutrons

B
1 proton

C
1 proton and 1 neutron

D
1 proton and 3 neutrons

Solution

The nucleus of deuterium contains 1 proton and 1 neutron.
Question 4
1 / -0

An element has two isotopes with mass numbers 16 and 18 and their average atomic weight is 16.5. What will be the percentage composition of these isotopes?

A
75%, 25%

B
35%, 65%

C
50%, 50%

D
33.33%, 66.67%

Solution

(16) (x) + (18) (1 - x) = 16.5
Solving gives:16x + 18 - 18x = 16.5

Simplifying this, we get
-2x + 18 = 16.5
So
-2x = 16.5 - 18
2x = 1.5
x = 0.75
Thus, 1 - x = 0.25
Hence, the percentage composition of these isotopes will be 75% and 25%, respectively.
Question 5
1 / -0

Isotope of which of the following elements is used in the treatment of cancer?

A
Iodine

B
Chlorine

C
Uranium

D
Cobalt

Solution

Isotope of cobalt is used in the treatment of cancer.
Question 6
1 / -0

What do you call the elements having fractional atomic masses?

A
Isotopes

B
Isobars

C
Isotones

D
Neutrons

Solution

The fractional atomic masses of elements are due to the existence of isotopes having different masses.
Question 7
1 / -0

Which of the following concepts was not considered in Rutherford's atomic model?

A
Electrical neutrality of atom

B
Quantization of energy

C
Electrons revolve around nucleus at very high speeds

D
Existence of nuclear forces of attraction on electrons

Solution

The concept of quantization of energy was not considered in Rutherford's atomic model.
Question 8
1 / -0

Who proposed nuclear model of atoms?

A
Niels Bohr

B
Thomson

C
Rutherford

D
James Chadwick

Solution

Nuclear model of atoms was perposed by Rutherford.
Question 9
1 / -0

The addition of a neutron to the nucleus of an atom results in

A
increase in nuclear charge

B
increase in atomic mass

C
formation of an isobar

D
none of these

Solution

The addition of a neutron to the nucleus of an atom results in increase in atomic mass.
Question 10
1 / -0

The nucleus of a chloride ion in comparison with that of a chlorine atom has

A
one more proton

B
one less proton

C
one more neutron

D
the same number of protons and neutrons

Solution

The nucleus of a chloride ion in comparison with that of a chlorine atom has the same number of protons and neutrons.
Question 11
1 / -0

Mass of a neutron is

A
same as proton

B
much less than that of proton

C
slightly less than that of proton

D
slightly more than that of proton

Solution

Mass of a neutron is slightly more than that of proton.
Question 12
1 / -0

Which one of the following may contain 11 neutrons, 10 electrons and 9 protons?

A
A cation

B
An anion

C
An isotope

D
A neutral atom

Solution

If an atom has 9 protons and 10 electrons means it has a negative one charge on it, thus it form an anion.
Question 13
1 / -0

Which of the following symbols represents a species containing 11 protons, 12 neutrons and 10 electrons?

A
²³Na⁺

B
²¹Ne

C
²³Na

D
²³Ne⁺

Solution

The particle that has 11 protons, 10 electrons and 12 neutrons is Na (Sodium cation).
Question 14
1 / -0

Atomic weight of a substance is equal to

A
equivalent weight ´ valency

B
equivalent weight ¸ valency

C
equivalent weight - valency

D
none of the above

Solution

Atomic weight of a substance = equivalent weight x valency
Question 15
1 / -0

The number of neutrons in the nucleus of an atom of is

A
13

B
14

C
27

D
40

Solution

The number of neutrons in the nucleus of an atom of aluminium is (27 - 13 = 14)
Question 16
1 / -0

If the tables of atomic masses were established with the oxygen atom, which was assigned the value of 100, then the atomic mass of the carbon atom would be approximately

A
24.0

B
12.0

C
75.0

D
112.0

Solution

If the tables of atomic masses were established with the oxygen atom, which was assigned the value of 100, then the atomic mass of the carbon atom would be approximately 75.0.
Question 17
1 / -0

How many neutrons are there in the chlorine element whose atomic mass is 35.5 u?

A
17

B
18

C
35.5

D
17.5

Solution

The element chlorine with relative atomic mass 35.5, consists of 17 protons, 18 neutrons and 17 electrons.
Question 18
1 / -0

The electronic configurations of elements A, B, C and D are (2, 8, 1), (2, 8, 2), (2, 8, 6) and (2, 8, 7) respectively. Which of these can make an ion with two negative charges?

A
A

B
B

C
C

D
D

Solution

The electronic configurations of element C is 2, 8, 6. Thus it accept two electrons to acquire stable noble gas configuration. Thus it form negative charge on it.
Question 19
1 / -0

Consider the following.
I. ZnSO₄
II. HNO₂
III. H₂SO₄
IV. CuSO₄
Which of the above contains univalent cations?

A
III and IV

B
II and III

C
I, II and IV

D
I and III

Solution

H⁺ ion is known as univalent cation. Thus from above given option HNO₂, H₂SO₄ contains univalent cations.
Question 20
1 / -0

What is the feature of atomic spectra?

A
Different atoms reflect light differently.

B
Protons exist in different energy levels.

C
Atoms are formed of seven orbitals.

D
Electrons exist in different energy levels.

Solution

The feature of atomic spectra is that electrons exist in different energy levels.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Atomic Structure Test - 6

Result

Atomic Structure Test - 6

Score

-

Rank

-

SHARING IS CARING

Question 1

A chemical change involves rearrangement of atoms.

Atoms form ions by gain or loss of electrons.

The number of atoms may change when a substance changes from solid to gaseous state.

Total number of atoms during a chemical change remains unaltered.

Solution

Question 2

protons

neutrons

electrons

nucleus

Solution

Question 3

1 proton and 2 neutrons

1 proton

1 proton and 1 neutron

1 proton and 3 neutrons

Solution

Question 4

75%, 25%

35%, 65%

50%, 50%

33.33%, 66.67%

Solution

Question 5

Iodine

Chlorine

Uranium

Cobalt

Solution

Question 6

Isotopes

Isobars

Isotones

Neutrons

Solution

Question 7

Electrical neutrality of atom

Quantization of energy

Electrons revolve around nucleus at very high speeds

Existence of nuclear forces of attraction on electrons

Solution

Question 8

Niels Bohr

Thomson

Rutherford

James Chadwick

Solution

Question 9

increase in nuclear charge

increase in atomic mass

formation of an isobar

none of these

Solution

Question 10

one more proton

one less proton

one more neutron

the same number of protons and neutrons

Solution

Question 11

same as proton

much less than that of proton

slightly less than that of proton

slightly more than that of proton

Solution

Question 12

A cation

An anion

An isotope

A neutral atom

Solution

²³Na⁺

²¹Ne

²³Na

²³Ne⁺