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Web(i) When ethyne is passed through red hot iron tube at 873 K, it trimerises to give benzene. In presence of nickel cyanide as catalyst and under high pressure, four molecules of ethyne … Web(vi) Cut the tube in the middle (Fig 2.6 c) and make the jet uniform and smooth by rubbing it with sand paper and by fire polishing. (b) (a) (c) Fig. 2.6 : (a) Heating the tube to draw a jet … festnetz tarife swisscom
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