Question

The compound/compounds which acts as a positive catalyst is/are

• A. Manganese dioxide
• B. Iron
• C. Phosphoric acid
• D. Vanadium pentoxide

Answer 1

Answer: (A), (B), (D)

The correct options are
A

Manganese dioxide

B

Iron

D

Vanadium pentoxide

A catalyst which increases the rate of the reaction is known as a positive catalyst. Following are examples of positive catalysts:

• Manganese dioxide is a type of positive catalyst used in the decomposition of hydrogen peroxide.
• Vanadium pentoxide is a positive catalyst used in the industrial preparation of sulphuric acid.
• Iron is a positive catalyst used in the manufacture of ammonia.

Phosphoric acid is a negative catalyst used to reduce the decomposition of hydrogen peroxide.