• Rusting of iron takes place in the presence of moisture and air. So the presence of air and water vapour in air are two necessary conditions for rusting of iron.
• 0⁰C is the freezing point of water.
• When a liquid changes form into a gas, the process is called vaporization. 
• True.
• Stainless steel is a corrosion-resistant alloy of iron, chromium and, in some cases, nickel and other metals.

I hope my answer helps you.... ✌

answer 1 = Rusting of iron takes place in the presence of moisture and air. So the presence of air and water vapour in air are two necessary conditions for rusting of iron.

answer 2 =0 degree celicius

answer 3= When a liquid changes form into a gas, the process is called vaporization. You can watch vaporization when you boil a pot of water. Vaporization happens in two ways: evaporation and boiling. Evaporation occurs when sunlight shines on water until it changes to vapor and rises into the air.

answer 4 true

answer 5 Stainless steel is an iron alloy with added elements such as chromium, nickel, silicon, manganese, nitrogen and carbon