The p-Block Elements Test

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The p-Block Elements Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

The valence shell electronic configuration of p-block elements is ns²np^1-6. But this is not true in the case of

A
Helium

B
nitrogen

C
carbon

D
Boron

Solution

He has 1s² configuration. It is a noble gas.
Question 2
1 / -0

There are six groups of p-block elements in the periodic table numbering from

A
14 to 19

B
13 to 18

C
11 to 16

D
12 to 17

Solution

After two s block and 10 d block, p block elements starts from group 13 to group 18.
Question 3
1 / -0

The variation in properties in a group of p-block of elements is due to

A
difference in oxidation states

B
difference in ionisation enthalpies

C
difference in electronegativities

D
difference in inner core of the electronic configuration

Solution

The difference in properties of p block element is because of presence of inner lying d and f electrons which have poor shielding effect.
Question 4
1 / -0

The maximum oxidation state shown by any p-block element is

A
the sum of the s electrons

B
the sum of the s and p-electrons

C
half of the sum of the s and p-electrons

D
the sum of the p-electrons

Solution

Maximum oxidation state of any p block element is the number of ionisable electrons which is equal to the sum of s and p electrons present in valence shell. For example valance shell electronic configuration of group 15 element is ns²np³ so max oxidation state is +5
Question 5
1 / -0

The sum of the s and p-electrons is called

A
the group oxidation state of p-block elements

B
the most unstable valence number of p-block elements

C
inert pair of p-block elements

D
the most stable valence number of p-block elements

Solution

Group oxidation state is the highest oxidation state exhibited by the elements present in any particular group.
For p block elements it is the sum of the s and p-electrons.
Question 6
1 / -0

Inert pair effect of p-block elements is due to the

A
the most unstable valence number of p-block elements

B
the most stable valence number of p-block elements

C
the group oxidation state of p-block elements

D
Inertness of the inner ns electrons because of ineffective shielding

Solution

The inert pair effect is nothing but the extra stability concept. Generally P-block elements shows variable valiancy which is equal to the maximum oxidation (Group oxidation state) state of that group of p-block elements, p block elements may show other oxidation state i.e.+2.

Group oxidation state +4 is obtained when electrons are lost from both ns and np levels,

+2 oxidation state is obtained while only np level electrons are lost due to extra stability and poor shielding of ns electron which are called inert pair. The effect is the inert effect
Question 7
1 / -0

The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is

A
In

B
AI

C
Ga

D
B

Solution

Ga
Question 8
1 / -0

As we move from B to Al in the p-block elements the sum of the first three ionisation enthalpies

A
increases

B
slightly decreases

C
remains the same

D
considerably decreases

Solution

On moving from B to Al size of the atom increases. So ionisation enthalpy decreases. Thus as we move from B to Al in the p-block elements the sum of the first three ionisation enthalpies considerably decreases.
This is the reason aluminium forms Al³⁺ ion.
Question 9
1 / -0

Boron forms only covalent compounds and not +3 ions because

A
the sum of its first three ionization enthalpies is very low.

B
the sum of its first two ionization enthalpies is very high.

C
the sum of its first two ionization enthalpies is very low.

D
the sum of its first three ionization enthalpies is very high.

Solution

Due to smaller size and high nuclear charge B has very high ionization energy value so does not show +3 oxidation state.

Further according to Fajan's rule, cation with small size and high positive charge leads to covalent bond.
Question 10
1 / -0

One of the following p-block elements has unusually low melting point

A
aluminium

B
Indium

C
gallium

D
boron

Solution

Ga does not do not follow any of the simple crystal structures. And two nearest Ga atoms are bonded by covalent bond which leads to low melting point.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 2

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The p-Block Elements Test - 2

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SHARING IS CARING

Question 1

Helium

nitrogen

carbon

Boron

Solution

Question 2

14 to 19

13 to 18

11 to 16

12 to 17

Solution

Question 3

difference in oxidation states

difference in ionisation enthalpies

difference in electronegativities

difference in inner core of the electronic configuration

Solution

Question 4

the sum of the s electrons

the sum of the s and p-electrons

half of the sum of the s and p-electrons

the sum of the p-electrons

Solution

Question 5

the group oxidation state of p-block elements

the most unstable valence number of p-block elements

inert pair of p-block elements

the most stable valence number of p-block elements

Solution

Question 6

the most unstable valence number of p-block elements

the most stable valence number of p-block elements

the group oxidation state of p-block elements

Inertness of the inner ns electrons because of ineffective shielding

Solution

Question 7

In

AI

Ga

B

Solution

Question 8

increases

slightly decreases

remains the same

considerably decreases

Solution

Question 9

the sum of its first three ionization enthalpies is very low.

the sum of its first two ionization enthalpies is very high.

the sum of its first two ionization enthalpies is very low.

the sum of its first three ionization enthalpies is very high.

Solution

Question 10

aluminium

Indium

gallium

boron

Solution

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