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Methanol is industrially prepared by

1. Oxidation of CH4 by steam at 900°C
2. Reduction of HCHO using LiAlH4
3. Reaction HCHO with a solution of NaOH
4. Reduction of CO using H2 and ZnO–Cr2O3

Correct answer: Reduction of CO using H2 and ZnO–Cr2O3

Solution

Methanol is industrially synthesized by the catalytic hydrogenation of carbon monoxide (CO) using hydrogen (H2) in the presence of ZnO–Cr2O3 as a catalyst.

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