Corrosion is the reaction of a metal to _____, commonly oxides, hydroxides, or sulfides. Group of answer choicesform a gasa more chemically stable formgenerate a protective layer

What is the best definition for ‘corrosion’?Damage to a metal by chemical reactions with substances in the environmentDamage to the shape of a metalProtection of a metal by coating it with a more reactive metalDamage to the protective coating surrounding a metal2Which of the following cause rusting? Oxygen and waterWater and heatCarbon dioxide and waterOxygen and heat3What is the chemical name for rust? Iron(III) oxideIron(III) hydroxideHydrated iron(III) oxideHydrated iron(II) oxide4Iron can be protected from rusting by coating it with various materials. Which of the following coatings is known as sacrificial protection? A more reactive metalPlasticPaintOil or grease5Which metal is used to galvanise iron? SteelZincAluminiumMagnesium6What is a disadvantage of sacrificial protection compared with other barrier methods? Very effectiveExpensive Can be used in harsh conditionsNo need to coat the whole surface of the metal

Explain the following terms with one example each.(a) Corrosion(b) Rancidity

Dissimilar metals will corrode in the presence of _______.Group of answer choicescaustic chemicalsan electrical currentan electrolytewater

When an acid reacts with a metal, what is the name given to the salt formed?a) Oxideb) Carbonatec) Chlorided) Sulfate

_______ steels have excellent corrosion and oxidation resistance.Group of answer choicesStainlessCarbonAlloyStructural