Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 9

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Weekly Quiz Competition

Question 1
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Why is Newland's method of classification of elements known as law of octaves?

A
Because it could classify only eight elements.

B
Because every eighth element had the properties similar to the first.

C
Because the classification was based on the atomic masses of element.

D
Because the elements were classified in eight groups.

Solution

Newlands' method of classification of elements was known as law of octaves because every eighth element had the properties similar to the first.
Question 2
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According to Newland's law of octaves, Beryllium resembles which of the following elements?

A
Sodium

B
Magnesium

C
Calcium

D
Aluminium

Solution

According to Newlands' law of octaves, every eighth element had the properties similar to the first. Thus, properties of beryllium resembles those of magnesium.
Question 3
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Which of the following elements are placed in an inverted sequence in Mendeleev's periodic table?

A
Cobalt and nickel

B
Sulphur and chlorine

C
Scandium and titanium

D
Magnesium and aluminium

Solution

Mendeleev placed the elements in the increasing order of their atomic masses, but cobalt was placed before nickel even though it has a higher atomic mass than nickel.
Question 4
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The properties of which element were similar to that of eka-Aluminium being predicted by Mendeleev?

A
Boron

B
Silicon

C
Gallium

D
Vanadium

Solution

Properties of gallium were similar to that of eka-Aluminium.
Question 5
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Based on the periodic trends for ionisation energy, which of the following elements has the highest ionisation energy?

A
F

B
He

C
N

D
B

Solution

Helium (He) has the highest ionisation energy because, like other noble gases, helium's valence shell is full. Therefore, helium is stable and does not readily lose or gain electrons.
Question 6
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Which one of the following statements regarding hydrogen is wrong?

A
Hydrogen never acts as cation in ionic salts.

B
Hydrogen has three isotopes of which, tritium is the most common.

C
Nascent hydrogen reduces ferric chloride to ferrous chloride.

D
Hydrogen gas is corrosive in nature.

Solution

Protium is the most common isotope with a relative abundance of 99.98%, followed by deuterium (0.0026–0.184%) and tritium.
Question 7
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Noble gases are so called because they

A
exhibit chemical inertness

B
react only with carbon compounds

C
are very reactive

D
cannot produce oxygen

Solution

Noble gases are so called because they exhibit chemical inertness.
Question 8
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The following electron arrangement exist in
1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s², 4p²

A
s – block

B
p – block

C
d – block

D
f – block

Solution

In the given electronic configuration, the last element enters in p-orbital. Thus, it is a p-block element.
Question 9
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What is the correct sequence of the following elements in the periodic table?
I. Lithium
II. Helium
III. Boron
IV. Hydrogen

Select the answer from the codes given below.

A
I, II, III, IV

B
IV, III, II, I

C
II, IV, III, I

D
IV, II, I, III

Solution

In the periodic table, elements are arranged in the increasing order of their atomic numbers. Thus, the correct increasing order of the given elements is hydrogen, helium, lithium and boron
Question 10
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Which of the following elements is having electronic configuration 2, 8, 8, 2?

A
Sodium

B
Potassium

C
Scandium

D
Calcium

Solution

Calcium is a chemical element with symbol Ca and atomic number 20. Thus, electronic configuration of calcium is 2, 8, 8, 2.
Question 11
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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

It can be concluded from the charge on the species that:
For A, Z= 13
A is Aluminium
E.C: 2, 8, 3

For B, Z= 12
B is Magnesium
E.C: 2, 8, 2

For C, Z= 5
C is Boron
E.C: 2, 3

For D, Z= 31
D is Gallium
E.C: 2, 8, 18, 3
Thus, A, C and D contain 3 valence electrons and belong to the group 13.
Question 12
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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 13
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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 14
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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 15
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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 16
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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 17
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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 18
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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 19
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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 20
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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 - 9

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Question 1

Because it could classify only eight elements.

Because every eighth element had the properties similar to the first.

Because the classification was based on the atomic masses of element.

Because the elements were classified in eight groups.

Solution

Question 2

Sodium

Magnesium

Calcium

Aluminium

Solution

Question 3

Cobalt and nickel

Sulphur and chlorine

Scandium and titanium

Magnesium and aluminium

Solution

Question 4

Boron

Silicon

Gallium

Vanadium

Solution

Question 5

F

He

N

B

Solution

Question 6

Hydrogen never acts as cation in ionic salts.

Hydrogen has three isotopes of which, tritium is the most common.

Nascent hydrogen reduces ferric chloride to ferrous chloride.

Hydrogen gas is corrosive in nature.

Solution

Question 7

exhibit chemical inertness

react only with carbon compounds

are very reactive

cannot produce oxygen

Solution

Question 8

s – block

p – block

d – block

f – block

Solution

Question 9

I, II, III, IV

IV, III, II, I

II, IV, III, I

IV, II, I, III

Solution

Question 10

Sodium

Potassium

Scandium

Calcium

Solution

Question 11

A, B and C

B, C and D

A, C and D

A, D and B

Solution

Question 12

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

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