A/an ______ is a substance that fasten the rate of a reaction without undergoing any permanent change themselves.

metal

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catalyst

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halogen

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isobar

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Solution

The correct option is B catalyst
A catalyst is a substance that can fasten the rate of a reaction without undergoing any permanent change themselves. Some of the commonly used catalysts are Ni, Pt, Pd etc...
Catalysts differs with different reactions.

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___are substances which alter the rates of chemical reactions without themselves undergoing any chemical change.

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