Chapter 4 Carbon and its Compounds

What is formalin? Write its uses.

Solution : Formalin A 37−40% solution of formaldehyde in water is called formalin. IUPAC name for formaldehyde is methanal. HCHO is the chemical formula for it. It is colourless liquid. It is the simplest aldehyde. It is an organic chemical made up of carbon, hydrogen, and oxygen atoms. It is a flammable liquid and has …

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SOME IMPORTANT CARBON COMPOUNDS – ETHANOL AND ETHANOIC ACID

Many carbon compounds are invaluable to us. But here we shall study the properties of two commercially important compounds – ethanol and ethanoic acid. (A) Properties of Ethanol Ethanol is a liquid at room temperature. Ethanol is commonly called alcohol and is the active ingredient of all alcoholic drinks. In addition, because it is a …

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Q. People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?

Solution : Agitation is necessary to clean clothes as agitation aid soap micelles to trap the oil, grease or any other impurities that have to be removed. When they are being beaten or agitated, the particles are removed from the clothes’ surfaces and go into the water, thus cleaning the clothes.