Question

Define promotors and inhibitors.

Answer 1

Promotors:

• Compounds that are used to increase the function of catalyst.without undergoing any chemical change.
• It increases the function of the catalyst by increasing the roughness and increasing free valencies and it increases the rate.
• Example-Molybdenum acts as a promotor for iron catalyst in Haber's process.

Inhibitors:

• Compounds that decrease the function of catalyst.
• It is also known as catalytic poison.
• It decreases the function of the catalyst and gets absorbed on the surface of the reactant and decreased free valencies and decreases the rate.
• Penicillin acts as an enzyme inhibitor.
• Example-Arsenic$\left(\mathrm{As}\right)$, Carbon Monoxide$\left(\mathrm{CO}\right)$, Hydrogen Sulphide$\left({\mathrm{H}}_2\mathrm{S}\right)$, Hydrogen Cyanide$\left(\mathrm{HCN}\right)$, etc.