Which of the following are negative catalysts?

Phosphoric acid

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Iron

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Manganese oxide

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Alcohol

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Solution

The correct options are
A Phosphoric acid
D Alcohol
Negative catalysts are those which decrease the rate of the chemical reaction

Phosphoric acid acts as a negative catalyst to decrease the rate of decomposition of hydrogen peroxide. Alcohol too acts as a negative catalyst in certain chemical reactions while manganese oxide and iron are positive catalysts and increase the rate of chemical reaction.

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