What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.

Question

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Answer 1

(i) Positive catalyst: When a catalyst increases the rate of chemical reaction, it is called a positive catalyst.
when potassium chlorate heated to $70 0^{\circ} C$ decomposes to evolve oxygen gas. when $M n O$ : is added the decomposition takes place at $30 0^{\circ} C$ .

(ii) Negative catalyst: When a catalyst decreases the rate of chemical reaction it is called a negative catalyst.Example. Phosphoric acid acts as a negative catalyst to decrease the rate of the decomposition of hydrogen peroxide. Alcohol too acts as a negative catalyst In certain chemical reactions.

Answer 2

(i) Positive catalyst: When a catalyst increases the rate of chemical reaction, it is called a positive catalyst.

when potassium chlorate heated to

70 0^{\circ} C

decomposes to evolve oxygen gas. when

M n O

: is added the decomposition takes place at

30 0^{\circ} C

.

(ii) Negative catalyst: When a catalyst decreases the rate of chemical reaction it is called a negative catalyst.Example. Phosphoric acid acts as a negative catalyst to decrease the rate of the decomposition of hydrogen peroxide. Alcohol too acts as a negative catalyst In certain chemical reactions.

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