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What is higher-alcohol catalysts consists of?

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What is higher-alcohol catalysts consists of?

(a) Sodium

(b) Calcium

(c) Barium carbonates

(d) All of the mentioned

This question was posed to me during an interview.

My doubt is from Hydrogenation in section Hydrogenation of Unit Processes

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Correct choice is (d) All of the mentioned

The best explanation: Higher-alcohol catalysts are usually of the mild hydrogenating type but contain some more alkaline materials, such as sodium, calcium, or barium carbonates or aluminium or magnesium oxides.

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