CBSE Class 12 Chemistry The p Block Elements Notes and Questions

CBSE Class 12 Chemistry The p Block Elements Notes and Questions. Based on CBSE and NCERT guidelines. The students should practice these Questions to gain perfection which will help him to get more marks in CBSE examination. Based on CBSE and CCE guidelines. The preparation should be in a manner which helps the students to concentrate more in areas which carry more marks.

 

Points to remember:‐

The general valence shell electronic configuration of p‐block elements ns2 np1‐6
 
GROUP 15 ELEMENTS:‐

Group 15 elements ; N, P, As, Sb & Bi
General electronic configuration: ns2np3
Physical Properties:‐

 Dinitrogen is a diatomic gas while all others are solids.
 N & P are non‐metals. As & Sb metalloids & Bi is a metals . this is due to decrease in ionization enthalpy & increase in atomic size .
 Electro negativity decreases down the group .
 
Chemical properties:‐

 Common oxidation states : ‐3, +3 & +5.
 Due to inert effect, the stability of +5 state decreases down the group & stability of +3 state increases .
 In the case of Nitrogen all Oxidation states from +1 to +4 tend to disproportionate in acid solution , e.g.:‐ 3HNO3→H2O +2NO
Anamalous behavior of Nitrogen :‐ due to its small size, high electronegativity, high ionization enthalpy and absence of d‐orbital.
 
N2 has unique ability to pπ‐pπ multiple bonds whereas the heavier of this group do not form pπ–pπ because there atomic orbitals are so large & diffuse that they cannot have effective overlapping.
Nitrogen exists as diatomic molecule with triple bond between the two atoms whereas other elements form single bonds in elemental state.
N cannot form dπ‐pπ due to the non availibility of d‐orbitals whereas other elements can.
 
 

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