Question

a) name a positive catalyst b) name a negative catalyst

Answer 1

Positive Catalyst :- Magnesium oxide, Iron and Nickel

Negative Catalyst :- Glycerin, Phosphoric acid  and Ethanol

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Answer 2

 Catalyst is a chemical substance used in chemical reactions that speeds them up or reduces its speed. Positive catalysts speed up the reactions whereas negative catalysts slow them down.
positive catalyst -sulfuric acid and manganese dioxide. 
negative catalyst -hydrogen and oxygen gases