CBSE Class 11-science Chemistry The p Block Elements
Introduction to p- Block Elements
Of the group 13 elements, only Boron forms covalent compounds while all others form ionic compounds.
Inert pair effect becomes predominant on going down the group.
Properties of Boron
Boron is the first element of group 13. So, it also differs from rest of the elements.
Boron is extremely hard and has a very high melting point. It shows diagonal relationship with Silicon.
Compounds of p- Block Elements
Boric acid is a mild acid often used as an antiseptic, insecticide and a flame retardant.
The simplest compound formed between Boron and hydrogen is Diborane.
Aluminium reacts with all mineral acids except Nitric acid.
Group 14 Elements
As we go move from top to bottom in group 14 metallic character increases.
The atomic and ionic radii increase on moving down the group from carbon to lead.
Allotropes of Carbon
Due to catenation and multiple bond formation carbon shows a number of allotropic forms like graphite, diamond, and fullerenes, carbon black, charcoal and coke.
Carbon remains unaffected by water and dilute acids and reacts with hot concentrated acids and halogens.
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