Question

in the preparation of oxygen gas from potassium chlorate, the substance used as catalyst is:
a.phosphoric acid
b.iron
c.platinum
d.manganese​

Answer 1

Explanation:

Answer

The most convenient method for preparing oxygen in the laboratory involves the catalytic decomposition of solid potassium chlorate. Potassium chlorate decomposes at a low temperature if previously mixed with manganese dioxide MnO

2

which is a catalyst for the decomposition. Only the potassium chlorate is decomposed, and no perchlorate is formed:

2KClO

3

→

MnO

2

2KCl+3O

2

Answer 2

Explanation:

The most convenient method for preparing oxygen in the laboratory involves the catalytic decomposition of solid potassium chlorate. Potassium chlorate decomposes at a low temperature if previously mixed with manganese dioxide MnO2 which is a catalyst for the decomposition.

MnO2