15 Dec CBSE Class 12 Chemistry Notes: The p Block Elements – Introduction · CBSE Class 12 Chemistry Notes: The p Block Elements – Nitrogen. General electronic configuration of p-block elements: The p- half filled p- orbitals. Allotropy: All elements of Group 15 except nitrogen show allotropy. Class 12 NCERT/CBSE board notes for P Block Elements. Board notes offered by thinkIIT is helpful in securing good marks in class The notes are based on .

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Class 12 Chemistry Revision Notes for Chapter 7 – The p-Block Elements

Properties of Aluminium Chloride. Nitric acid, HNO 3. Stable only above K. Name of oxy — acid. Reaction wit h p block elements notes class 12 cbse C and Si show a tendency to combine with its own atoms to form long chain polymers. Such covalent dimers of pseudohalide ions are called pseudohalogens. These are the carbides of non-metals such as silicon and boron. They exist only in aqueous solutions or in the form of their salts. Used to provide inert atmosphere in melting and welding of easily oxidizable metals.

Their acidic character decreases down the group.

Electronegativity decreases down the group. Ammonia molecule elementts trigonal pyramidal with nitrogen atom at the apex. Turns the filter paper soaked in platinum or palladium chloride to pink or green.

It is chemically inert at room temperature due to the presence of triple bond with p block elements notes class 12 cbse bond dissociation energy. Boiling point of NH 3 is highest due to the presence of hydrogen bonding. They do not chse in the reactions easily because they have.

It has a pyramidal shape, in which phosphorus is sp 3 hybridised. Among the oxo-acids of S, sulphuric acid is most important. Phosphorus trichloride, PCl 3.

The first ionisation energies are relatively high but decreases down the group. Phosphorus pentachloride is prepared by the reaction of white phosphorus with excess of dry chlorine or can be prepared by the action of SO 2 Cl 2 on phosphorus.

It is soluble in CS 2 but insoluble in H 2 O. Properties of Carbon di-oxide. All the elements of the group form volatile ,hydrides. Group 15 elements react to form two series of halides: The first four elements are non- metallic in character.

III Group 17 Elements Concentrated HNO 3 is a strong oxidising agent and attacks most metals except noble metals. There is a considerable increase in covalent radius p block elements notes class 12 cbse N to P. Studying in Grade 6th to 12th? Silicon polymers containing Si — O — Si linkages formed by the hydrolysis of alkyl or aryl substituted chlorosilanes and their subsequent polymerisation. Decreases from C to Sn and then increases up to Pb.

II Group 16 Elements 9. The tendency to show —3 oxidation state decreases down the group due to increased size and hence decreased electronegativity. It is unstable and easily decomposes into oxygen. Our IITian faculty will contact you in 1 working day. SiC also known as Carborundum. The following table gives the brief information of various oxides of nitrogen: Boiling point of hydrides except Elementx 3 increases down the group as with increase in size due to the Van der Waals forces also increase down the group.

It is insoluble in water and is a weaker base than ammonia. The group number 13 to 18, p block elements notes class 12 cbse which the last electrons or the valence electrons enter in the p- orbital are called the p -block elements.

CBSE Class 12th Chemistry Notes: The p-Block Elements (Part – I)

They are collectively called as noble gases. Electronegativity decreases on moving down the group from N to Bi. By heating oxides of heavy metals e. It can form coordinate covalent bond with the transition metal ion and form complexes, e.

In the laboratory, dinitrogen is prepared by treating an aqueous solution of ammonium chloride with sodium nitrite. Phosphine is prepared by the reaction of calcium phosphide with water or dilute HCl.

Class 12 Chemistry Revision Notes for Chapter 7 – The p-Block Elements

Pierre and Miquelon St. Prepared by fusing elememts ash with pure sand at high temperature: Increases down the group. Basicity decreases down the group. It is insoluble in water and carbon disulphide.