ICSE BoardEnglish MediumSTD 8CHEMISTRYChemical Reactions3 Marks
Question
A catalyst $\&$ a promoter.
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Answer
Catalyst: "A substance which alters the rate of chemical reaction." e. g. $\ce{MnO_2, V_2O_2, Fe}$, Pt. etc.
The positive catalyst : A catalyst which speeds up the reaction.
Negative catalyst : A catalyst which reduces the rate of reaction, e.g. alcohol. Enzymes are biological catalysts present in human body and accelerate the biochemical reactions in the body.
Promotors is a catalyst to catalyst, i.e. a substance which ' increases the activity of a catalyst.
Molybdenum $\ce{[MO]}$ is added to the catalyst iron $\ce{[Fe]}$ to increase its efficiency.
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