P-BLOCK

Question 1

Atomic Radius order of Group-13 elements and why?

Answer 1

B<Al>Ga<In≃Tl</Al>

Reason: Poor Shielding Effect of d-orbital electrons

Question 2

Ionization Enthalpy order of group-13 elements and why?

Answer 2

B>Tl>Ga>Al>In

Reason: Poor Shielding Effect of f-orbital electrons

Question 3

Electronegativity Order of group-13 elements and why?

Answer 3

Al<Ga<In<Tl<B

Reason: Poor Screening effect causing an increase in ENC…thereby an increase in Electronegativity can be observed

Question 4

Most abundant metal in the earth’s crust?

Answer 4

Aluminium

Question 5

Stability of +1 oxidation state for group 13 elements increases or decreases down the group?

Answer 5

Increases

Reason: Down the group, electrons are tightly bound to nucleus allowing the release of only one electron

Question 6

Melting point order for Group-13 elements

Answer 6

B>Al>Tl>In>Ga

only exception is Galium

Question 7

Boiling point order for group-13 elements

Answer 7

Decreases down the group

B>Al>Ga>In>Tl