In Fe₂O₃, oxygen has valency 2. Two Fe atoms combined with three O atoms: total negative charge = 6. For two Fe, total positive = 6, so each Fe has +3. Valency = 3 (ferric). In FeO, valency is 2 (ferrous).
Explanation:
Natural rubber (cis-1,4-polyisoprene) is an addition polymer of isoprene (2-methyl-1,3-butadiene). It is obtained from latex of rubber tree (Hevea brasiliensis). It is elastic but weak. Vulcanization with sulfur introduces cross-links, improving strength and elasticity. Ethene gives polyethylene; styrene gives polystyrene; vinyl chloride gives PVC.
Explanation:
Graham's Law of Diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its density (or molar mass) at constant temperature and pressure (r ∝ 1/√d). Lighter gases diffuse faster than heavier ones, which explains why helium balloons deflate quickly.
Explanation:
Hydrogen peroxide is a strong oxidizing agent. In dilute solutions (3-6%), it is used as a mild antiseptic for minor cuts and as a bleaching agent for hair, teeth, and delicate materials like silk and wool. It decomposes into water and oxygen.
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