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What will be the catalyst A which can be used to carry out this synthesis of glycol?

What will be the catalyst A which can be used to carry out this synthesis of glycol? Correct Answer Catalyst Ag, 200 – 400℃

Catalyst Ag at 200 – 400℃ can be used to carry out this synthesis of glycol as shown in below reaction.

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Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.
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