p-Block Elements Test

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p-Block Elements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

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

A
difference in inner core of the electronic configuration

B
difference in oxidation states

C
difference in electronegativities

D
difference in ionisation enthalpies

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 2
1 / -0

Among the following which is the strongest oxidizing agent?

A
Br₂

B
Cl₂

C
F₂

D
I₂

Solution

Because of its highest electronegativity it (F2) is very strongest oxidizing agent.
Question 3
1 / -0

The stability of + 1 oxidation state increases in the sequence

A
Tl  <  In  <  Ga  < Al

B
In  <  Tl  <  Ga  <  Al

C
Ga <  In <  Al < Tl

D
Al  <  Ga  <  In  <  Tl
Question 4
1 / -0

The sum of the s and p-electrons is called

A
the most stable valence number of p-block elements

B
inert pair of p-block elements

C
the group oxidation state of p-block elements

D
the most unstable 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 5
1 / -0

Which of the following does not exist in free form?

A
BF₃

B
BCl₃

C
BBr₃

D
BH₃
Question 6
1 / -0

Which of the following statements is not correct?

A
PbCl₄ is less stable than SnCl₄ but PbCl₂ is more stable than SnCl₂.

B
PbO₂ is a stronger oxidant than SnO₂.

C
(SiH)₃N is a stronger base than (CH₃)₃N.

D
Sn(II) is a reducing agent but Pb(II) is not.
Question 7
1 / -0

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

A
the group oxidation state of p-block elements

B
the most stable valence number of p-block elements

C
the most unstable valence number 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 8
1 / -0

Which of the following statements is correct?

A
BCl₃ and AlCl₃ are both Lewis acids and BCl₃ is stronger than AlCl₃.

B
BCl₃ and AlCl₃ are both Lewis acids and AlCl₃ is stronger than BCl₃.

C
BCl₃ and AlCl₃ are equally strong Lewis acids.

D
Neither BCl₃ nor AlCl₃ is a Lewis acid.
Question 9
1 / -0

The correct order of C-O bond length among CO, CO₃^2- and CO₂ is

A
CO < CO₂ < CO₃^2-

B
CO₂ < CO₃^2- < CO

C
CO < CO₃^2- < CO₂

D
CO₃^2- < CO₂< CO
Question 10
1 / -0

Boron forms only covalent compounds and not +3 ions because

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

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

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

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

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.

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p-Block Elements Test - 3

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p-Block Elements Test - 3

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Question 1

difference in inner core of the electronic configuration

difference in oxidation states

difference in electronegativities

difference in ionisation enthalpies

Solution

Question 2

Br2

Cl2

F2

I2

Solution

Question 3

Tl < In < Ga < Al

In < Tl < Ga < Al

Ga < In < Al < Tl

Al < Ga < In < Tl

Question 4

the most stable valence number of p-block elements

inert pair of p-block elements

the group oxidation state of p-block elements

the most unstable valence number of p-block elements

Solution

Question 5

BF3

BCl3

BBr3

BH3

Question 6

PbCl4 is less stable than SnCl4 but PbCl2 is more stable than SnCl2.

PbO2 is a stronger oxidant than SnO2.

(SiH)3N is a stronger base than (CH3)3N.

Sn(II) is a reducing agent but Pb(II) is not.

Question 7

the group oxidation state of p-block elements

the most stable valence number of p-block elements

the most unstable valence number of p-block elements

Inertness of the inner ns electrons because of ineffective shielding

Solution

Question 8

BCl3 and AlCl3 are both Lewis acids and BCl3 is stronger than AlCl3.

BCl3 and AlCl3 are both Lewis acids and AlCl3 is stronger than BCl3.

BCl3 and AlCl3 are equally strong Lewis acids.

Neither BCl3 nor AlCl3 is a Lewis acid.

Question 9

CO < CO2 < CO32-

CO2 < CO32- < CO

CO < CO32- < CO2

CO32- < CO2 < CO

Question 10

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

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

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

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

Solution

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Br₂

Cl₂

F₂

I₂

BF₃

BCl₃

BBr₃

BH₃

PbCl₄ is less stable than SnCl₄ but PbCl₂ is more stable than SnCl₂.

PbO₂ is a stronger oxidant than SnO₂.

(SiH)₃N is a stronger base than (CH₃)₃N.

BCl₃ and AlCl₃ are both Lewis acids and BCl₃ is stronger than AlCl₃.

BCl₃ and AlCl₃ are both Lewis acids and AlCl₃ is stronger than BCl₃.

BCl₃ and AlCl₃ are equally strong Lewis acids.

Neither BCl₃ nor AlCl₃ is a Lewis acid.

CO < CO₂ < CO₃^2-

CO₂ < CO₃^2- < CO

CO < CO₃^2- < CO₂

CO₃^2- < CO₂< CO