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CONTENTS   Sources of hydrocarbon Classification (of aliphatic hydrocarbon) Petroleum and natural gas (i) Refining of Petroleum by fractional distillation (ii) Uses of different fractions   PETROLEUM CHEMISTRY HYDROCARBON AND

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CONTENT ELEMENTS AND SYMBOLS CLASSIFICATION OF ELEMENTS VALENCY   ELEMENTS AND SYMBOLS An element is a substance that cannot be split into simpler units by ordinary chemical processes. There are