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Positive Catalyst :- Magnesium oxide, Iron and Nickel

Negative Catalyst :- Glycerin, Phosphoric acid  and Ethanol

Please mark it brainiest answer..........................Please i need it

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 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 
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