p - Block Elements

chemistry 12th class cbse notes

Oxygen – Types, Preparation, Properties and Uses

Oxygen is the first element of Group 16 with the electronic configuration of 1s2 2s2 2p4 in the ground state. Oxygen has two allotropes:...
chemistry 12th class cbse notes

Chemical Properties and Trends in Chemical Reactivity

Chemical Properties and Trends in Chemical Reactivity The anomalous behaviour of oxygen, like other members of the p-block present in the second period, is...
chemistry 12th class cbse notes

Oxidation States

Negative and Positive Oxidation state: The elements of Group 16 exhibit a number of oxidation states (Above Table). The stability of -2 oxidation state...
chemistry 12th class cbse notes

Group 16 Elements General Properties

Group 16 Element Oxygen, sulphur, selenium, tellurium and polonium constitute Group 16 of the periodic table. This is sometimes known as a group of...
chemistry 12th class cbse notes

Phosphine, Phosphorus Trichloride, Phosphorus pentachloride

Phosphorus forms two types of halides, PX3 (X = F, Cl, Br, I) and PX5 (X = F, Cl, Br). Phosphorus trichloride, PCl3 Phosphorus...
chemistry 12th class cbse notes

Phosphorus

Phosphorus Phosphorus is an essential constituent of elements and plants. It has many allotropic forms; the important ones are: White phosphorus Red phosphorus Black phosphorus Uses of...
chemistry 12th class cbse notes

Nitric acid- HNO3

Nitric acid Nitric acid is the most important oxoacid formed by nitrogen. It is a colourless liquid. In the gaseous state, HNO3 exists as a...
chemistry 12th class cbse notes

Oxides of Nitrogen

Oxides of nitrogen Nitrogen forms a total of five oxides from +1 oxidation states to +5 oxidation state. The five oxides of nitrogen are N2O,...
chemistry 12th class cbse notes

Ammonia – Preparation and Properties

Ammonia Ammonia molecule is trigonal pyramidal with the nitrogen atom at the apex. It has 3 bond pairs and 1 lone pair. N is sp3...
chemistry 12th class cbse notes

Dinitrogen – Preparation and Properties

Preparation of Dinitrogen By heating a mixture of NH4Cl and NaNO2. N2 is collected by the downward displacement of water. By treating an aqueous solution of...