Answers

2014-01-03T12:07:50+01:00
Catalyst are chemical substance which speed up chemical reaction but dont take part in the reaction.example of catalyst is hetrogenous and homogenous catalyst

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2014-01-03T16:39:24+01:00
A catalst is a substance which alter theĀ  rate of a chemical reaction ,but it self remaines chemically and quantitatively unchange at the end of the reaction.example positive and negative

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