Sodium (Na) is a soft, silvery-white alkali metal (Group 1). It is highly reactive, conducts electricity, and is malleable. Sulfur and phosphorus are non-metals; chlorine is a non-metal halogen gas. Sodium is never found free in nature; it is stored under kerosene to prevent reaction with air/moisture. It reacts vigorously with water, producing NaOH and H₂.
Explanation:
Chlorofluorocarbons (CFCs) release chlorine atoms in stratosphere which catalytically destroy ozone. CO₂ causes global warming, SO₂ acid rain, N₂ is inert. Ozone hole over Antarctica is due to CFCs.
Explanation:
Copper pyrites, also known as chalcopyrite, is the most important and abundant ore of copper. Its chemical formula is CuFeS2. Bauxite is the ore of aluminum, cinnabar is the ore of mercury, and haematite is the primary ore of iron.
Explanation:
Portland cement is primarily composed of tricalcium silicate (3CaO·SiO₂), dicalcium silicate (2CaO·SiO₂), tricalcium aluminate (3CaO·Al₂O₃), and tetracalcium aluminoferrite. These compounds are formed by heating limestone and clay at high temperatures and then grinding with gypsum.
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