alleryStart learning →Rust is mainly a reddish-brown compound of iron with
Anitrogen gas
Bcarbon dioxide
Coxygen gas
Dhelium gas
Answer & Solution
Correct answer: C. oxygen gas
Rust is an iron oxide formed when iron reacts with oxygen in the presence of water.
Keep practising Physical and chemical changes
Browse all Physical and chemical changes questions for Olympiad (Class 7), or explore more Science topics.
Related questions
A change in colour during a process most reliably suggestsCopper turns green after long exposure to damp air. This shows copper hasWhich pair correctly matches the change with its type?Baking soda is added to vinegar and bubbles of gas appear. This showsWhich of these is a physical change?A chemical reaction changes the atoms of a substance byRusting is specifically the corrosion of which metal?Stainless steel resists rusting because it forms a thin layer of