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In most of the catalytic processes powde...

In most of the catalytic processes powdered or spongy metals are used a s catalysts. For example in Haber process, spongy iron is used while in reduction of alkenes finely divided nickel is used as catalyst, Substantiate why?

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Because finely divided and spongy substances have large surface area. This increases the adsorption of the reacting molecules on the surface of the catalyst.
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