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Alkanes containing 6 or more carbon atoms catalytically treated under pressure, passed over chromic oxide carried on an alumina support at temperature ranging 480-550 degree C,eventually

$\begin{array}{1 1}a)\;Increases\; knocking\; efficiency \;of \;fuel\\b)\; Decreases\; knocking\; efficiency \;of\; fuel\\c)\; Knocking\; remains \;unaffected\\d)\; Can't \;be\; predicted\end{array}$

1 Answer

‘Knocking’ is the premature, pressure-caused spontaneous ignition of the fuel in the engine cylinders. The ignition causes counter pressure on the cylinder during the upstroke of the piston. The result is a loud ‘knock’ and inefficient engine performance
Hence (a) is the correct answer.
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