Question

Without water, iron will not rust at ordinary temperatures. Iron and oxygen may lie together for hundreds of years without any chemical reaction taking place. The moment a drop of water is added rusting can begin. Water acts as a:

• A. catalyst
• B. wettening agent
• C. chain reactor
• D. solvent

Answer 1

The correct option is A catalyst

Solution:- (A) catalyst

For iron to rust, three things are needed: iron, water and oxygen. When these three type of molecules are near each other, the water acts as a catalyst for the rust reaction, acting as a good electrolyte permitting easier electron flow between atoms.