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The presence of what enhances the catalytic effect of acids?

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The presence of what enhances the catalytic effect of acids?

(a) Copper oxide

(b) Nickel

(c) Zinc chloride

(d) All of the mentioned

I got this question in an international level competition.

Asked question is from Catalystic Esterification topic in chapter Esterification of Unit Processes

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The correct answer is (c) Zinc chloride

For explanation I would say: The presence of zinc chloride seems to enhance the catalytic effect of acids. The addition of a large amount of calcium chloride aids in the separation of water as a layer. Zinc and tin chlorides are said to be active catalysts.

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