Download CBSE Class 12 Chemistry P Block Elements Notes Set A in PDF format. All Revision notes for Class 12 Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Chemistry in Class 12. Our teachers have designed these concept notes for the benefit of Class 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Chemistry given on studiestoday
Revision Notes for Class 12 Chemistry Unit 07 The p-Block Elements
Class 12 Chemistry students should refer to the following concepts and notes for Unit 07 The p-Block Elements in Class 12. These exam notes for Class 12 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks
Unit 07 The p-Block Elements Notes Class 12 Chemistry
1.Account for the following: (Group 15 elements)
(i) There is a considerable increase in covalent radius from N to P. However, from As to Bi only small increase in covalent radius is observed.
Ans: This is due to the presence of completely filled d and/or f orbital in heavier members which have low screening effect.
(ii) Ionization enthalpy decreases down the group 15.
Ans: Due to gradual increase in atomic size.
(iii) The ionization enthalpy of the group 15 elements is much greater than that of group 14 elements in the corresponding periods.
Ans: Because of the extra stable half-filled p orbital electronic configuration and smaller size.
(iv) Nitrogen exists as gas and phosphorus as solid.
Ans: Because N2 is Diatomic molecules, hence weak Vander Waal’s force of attraction thus is a gas whereas P4 is tetra atomic hence Stronger Vander Waal’s force of attraction thus it is solid.
Symbol
(v) NH3 is basic while BiH3 is only feebly basic.
Ans: NH3 is basic due to smaller size & high electron density on lone pair of Nitrogen.
(vi) The HNH angle value is higher than HPH, HAsH, and HSbH angles.
Ans: Due to increase in repulsion by the lone pair with increase in size of lone pair from N to Sb.
(vii) R3P=O exist but R3N=O does not.
Ans: Due to the absence of d orbitals in valence shell of nitrogen. Because of inability of Nitrogen to expand its covalency beyond four, nitrogen cannot form d π–p π bond.
(viii) Nitrogen shows catenation properties less than phosphorus.
Ans: Because N-N bond is weaker than the single P-P bond.& strong pπ–pπ overlap in Nitrogen.
(ix) Ammonia has higher boiling point than Phosphine.
Ans: Ammonia (NH3) form hydrogen bond but Phosphine (PH3) does not.
(x) H3PO3 is diprotic acid.
Ans: Due to presence of two ionisable –OH group. (Draw the structure of H3PO3).
(xi) Oxides of nitrogen have open chain structures while those of phosphorus have closed chain or cage structures
Ans:Nitrogen has ability to form multiple bonds involving p-p overlap while Phosphorous does not.
(xii) A nitrogen atom has five valence electrons but it does not form the compound NCl5.
Ans: Because of absence of d-orbitals it can’t expand its covalency from 3 to 5..
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CBSE Class 12 Chemistry Unit 07 The p-Block Elements Notes
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Notes for Chemistry CBSE Class 12 Unit 07 The p-Block Elements
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Unit 07 The p-Block Elements Notes for Chemistry CBSE Class 12
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Unit 07 The p-Block Elements CBSE Class 12 Chemistry Notes
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Notes for CBSE Chemistry Class 12 Unit 07 The p-Block Elements
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