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
Question
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
Solution
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The best definition for 'corrosion' is "Damage to a metal by chemical reactions with substances in the environment".
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The factors that cause rusting are "Oxygen and water".
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The chemical name for rust is "Hydrated iron(III) oxide".
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The coating known as sacrificial protection is "A more reactive metal".
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The metal used to galvanise iron is "Zinc".
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A disadvantage of sacrificial protection compared with other barrier methods is that it is "Expensive".
Similar Questions
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Explain the following terms with one example each.(a) Corrosion(b) Rancidity
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