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Which of the following is mild hydrogenation catalyst?

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Which of the following is mild hydrogenation catalyst?

(a) Nickel

(b) Iron

(c) Zinc oxide

(d) All of the mentioned

I have been asked this question by my school teacher while I was bunking the class.

I would like to ask this question from Hydrogenation in chapter Hydrogenation of Unit Processes

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Right option is (c) Zinc oxide

To explain: The large number of catalysts developed for the direct synthesis of methanol from water gas belong to this, class, and they usually contain copper, zinc oxide, chromium oxide, and manganese oxide and may include some of the rarer elements as promoters.

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