APSC Prelims and Mains Notes, APSC Test Series
Preparation of nitrogen Nitrogen is found in both free and combined states. It occupies 78.07% by volume. Nitrogen can be prepared: By heating copper in air: Firstly, air is passed through lime water and then concentrated sulphuric acid to make the air free from carbon dioxide and moistures respectively. The air contains only nitrogen and … Read more
Copper Age Chalcolithic age in India is the first metal age. Metals like copper and its alloy bronze are melted at low temperature. The important sites of this period are the Indus valley sites. The Chalcolithic culture of Central, Eastern and Southern regions of India show altogether different features. The Chalcolithic culture represents … Read more
Metallurgy of Copper Copper Mining: The commonest ore used in the extraction of copper is Chalcopyrite (CuFeS2) also known as Copper Pyrites and other such sulfides. The percentage of copper in the actual ore is too low for direct extraction of copper to be viable. The concentration of ore is required and it is done by the Froth Flotation … Read more