Stainless steel contain sufficient chromium to from a passive film of chromium oxide, which prevents further surface corrosion by by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure.

Correct Option: C

Stainless steel contain sufficient chromium to from a passive film of chromium oxide, which prevents further surface corrosion by by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure.

Rusting is a chemical process that results in corrosion or oxidation when oxygen metal comes in contact with a metal.

Correct Option: A

Rusting is a chemical process that results in corrosion or oxidation when oxygen metal comes in contact with a metal.

Exposure of common salt to air is a physical change.

Correct Option: A

Exposure of common salt to air is a physical change.

Sodium hydroxide, aluminium and water reacts to from sodium aluminium oxide and hydrogen gas.

Correct Option: B

Sodium hydroxide, aluminium and water reacts to from sodium aluminium oxide and hydrogen gas.

Tetra ethyl lead (C₂H₅)₄ Pb is used as an antiknock compound. It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

Correct Option: B

Tetra ethyl lead (C₂H₅)₄ Pb is used as an antiknock compound. It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.