Cracking a Hydrocarbon

Liquid paraffin (a mixture of alkanes of chain length C20 and greater) is vaporised and passed over a hot pumice stone catalyst. A gaseous product is obtained which is flammable and which will decolorise bromine water and acidified permanganate ions. The same apparatus and method can be used to dehydrate ethanol.
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How to save hundreds of pounds by servicing your own Aga in about 20 minutes instead of paying a technician to visit your house.
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