Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following belongs to same group?
(1) A³⁺ (Number of electrons = 10)
(2) B²⁺ (Number of electrons = 10)
(3) C (Number of electrons = 5)
(4) D (Number of electrons = 31)

A
A, B and C

B
B, C and D

C
A, C and D

D
A, D and B

Solution

Among the given elements, A contains 13 electrons, B contains 12 electrons, C contains 5 electrons and D contains 31 electrons. Thus, A, C and D are group 13 elements.
Question 2
1 / -0

Which of the following is not true?

A
All 4^th period elements have 4^th shell as the valence shell.

B
In all 4^th period elements differentiating electrons enter 4^th shell.

C
In 4^th period elements, differentiating electrons enter either 4^th shell or 3^rd shell.

D
1^st transition series elements are present in 4^th period.

Solution

'In all the 4^th period elements, differentiating electrons enter the 4^th shell' is an incorrect statement. As in 4^th period elements, differentiating electrons enter either 4^th shell or 3^rd shell.
Question 3
1 / -0

What is same among Na⁺, F^– and Mg²⁺?

A
Atomic size

B
Electronic configuration

C
Ionisation energy

D
Nuclear charge

Solution

Electronic configuration of Na+, F– and Mg2+ ions will be the same because all contain the same number of electrons.
Question 4
1 / -0

Which of the following doesn't come under zero group?

A
He

B
K

C
Ne

D
Ar

Solution

Potassium (K) is an alkali metal. It doesn't come under zero group, i.e. group 18.
Question 5
1 / -0

How many valence electrons can be present in the second elements of any period?

A
1

B
2

C
5

D
7

Solution

Two valence electrons can be present in the second elements of any period.
Question 6
1 / -0

Which of the following is true with respect to atomic size?

A
H > F > Cl > Br > I

B
H < F < Cl < Br < I

C
F < Br < H < Cl < I

D
Br < Cl < H < F < I

Solution

Option (2) is correct because as we move down a group, atomic size increases as the number of shells increases.
Question 7
1 / -0

Which of the following has the smallest size?

A
Li

B
Be²⁺

C
Na⁺

D
Mg²⁺

Solution

Be²⁺ ion has the smallest size because across a period, atomic size decreases, whereas it increases down a group. Due to this reason, Be²⁺ has the smallest size.
Question 8
1 / -0

Arrange the following atoms in order of increasing ionisation energy.
O, S, Se, Te, Po

A
Se, Te, Po, S, O

B
S, Se, Te, Po, O

C
Po, Te, Se, S, O

D
Te, Po, S, O, Se

Solution

The correct order of increasing ionisation energies is: Po, Te, Se, S, O, because down a group, ionisation energy increases because attraction between nucleus and electrons in the shells decreases due to increase in the size of an atom.
Question 9
1 / -0

Arrange the following basic oxides in the order of increasing basic nature.
Li₂O, Cs₂O, K₂O, Rb₂O, Na₂O

A
Li₂O, Na₂O, K₂O, Rb₂O, Cs₂O

B
Na₂O, Li₂O, K₂O, Rb₂O, Cs₂O

C
K₂O, Na₂O, Li₂O, Rb₂O, Cs₂O

D
Cs₂O, Rb₂O, K₂O, Na₂O, Li₂O

Solution

The basic nature of group A metal oxides increases as we move down a group. Thus, the correct order of increasing basic character is: Li₂O, Na₂O, K₂O, Rb₂O, Cs₂O.
Question 10
1 / -0

Which of the following is the correct trend of metallic character when there is increase in atomic number?

A
Decreases in a period and increases in a group

B
Increases in a period and decreases in a group

C
Increases both in a period and a group

D
Decreases both in a period and a group

Solution

As the atomic number increases, metallic character of elements decreases across a period and increases down a group.

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Periodic Classification of Elements Test - 6

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Question 1

A, B and C

B, C and D

A, C and D

A, D and B

Solution

Question 2

All 4th period elements have 4th shell as the valence shell.

In all 4th period elements differentiating electrons enter 4th shell.

In 4th period elements, differentiating electrons enter either 4th shell or 3rd shell.

1st transition series elements are present in 4th period.

Solution

Question 3

Atomic size

Electronic configuration

Ionisation energy

Nuclear charge

Solution

Question 4

He

K

Ne

Ar

Solution

Question 5

1

2

5

7

Solution

Question 6

H > F > Cl > Br > I

H < F < Cl < Br < I

F < Br < H < Cl < I

Br < Cl < H < F < I

Solution

Question 7

Li

Be2+

Na+

Mg2+

Solution

Question 8

Se, Te, Po, S, O

S, Se, Te, Po, O

Po, Te, Se, S, O

Te, Po, S, O, Se

Solution

Question 9

Li2O, Na2O, K2O, Rb2O, Cs2O

Na2O, Li2O, K2O, Rb2O, Cs2O

K2O, Na2O, Li2O, Rb2O, Cs2O

Cs2O, Rb2O, K2O, Na2O, Li2O

Solution

Question 10

Decreases in a period and increases in a group

Increases in a period and decreases in a group

Increases both in a period and a group

Decreases both in a period and a group

Solution

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All 4^th period elements have 4^th shell as the valence shell.

In all 4^th period elements differentiating electrons enter 4^th shell.

In 4^th period elements, differentiating electrons enter either 4^th shell or 3^rd shell.

1^st transition series elements are present in 4^th period.

Be²⁺

Na⁺

Mg²⁺

Li₂O, Na₂O, K₂O, Rb₂O, Cs₂O

Na₂O, Li₂O, K₂O, Rb₂O, Cs₂O

K₂O, Na₂O, Li₂O, Rb₂O, Cs₂O

Cs₂O, Rb₂O, K₂O, Na₂O, Li₂O