The p-Block Elements Test

Result

The p-Block Elements Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following elements can be involved in pπ – dπ bonding?

A
Carbon

B
Nitrogen

C
Phosphorus

D
Boron

Solution

Among four choices only phosphorous has vacant d-orbital.
Question 2
1 / -0

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

A
HF

B
HCl

C
HBr

D
HI

Solution

On moving down the group atomic radii increases and bond dissociation enthalpy increases. So the highest bond dissociation enthalpy is of HF.
Question 3
1 / -0

Strong reducing behaviour of H₃PO₂ is due to

A
Low oxidation state of phosphorus

B
Presence of two –OH groups and one P–H bond

C
Presence of one –OH group and two P–H bonds

D
High electron gain enthalpy of phosphorus

Solution

In H₃PO₂, two H atoms are bonded directly to P atom which imparts reducing character to the acid.