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Aldehyde can be described as any group of organic compounds in which a carbon atom shares a double bond with an oxygen atom, a single bond with a hydrogen atom and a single bond with another atom or group of atoms (designated R in general chemical formulas and structure diagrams). Decreases. 2) The chemical formula of aniline is___. Acetic acid. I drove myself crazy by reading stories of failed vivas on the internet and convinced myself of my impending doom. XEW IMPRESSION, 1974 The last (4th) Edition of this book appeared in 1960, and has been followed by four New Impressions, the last in 1967. According to Avogadro’s law, at the same temperature and pressure, an equal volume of gases contains the same number of molecules regardless of the chemical nature and physical properties. Multiple Choice Questions with answers on Microscopy Basics. 4 mm C. 6 mm D. 8 mm # Passive impression technique involves: A. Answer. 4. Crystallization. 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