Corrosion MCQ Class 10

Q. 1 What is the chemical formula of rust?

(1) Fe2O3

(2) Fe2O3.xH2O

(3) FeCO3

(4) FeCO3.xH2O

Ans: (1) Fe2O3

Q. 2 What is required for iron to rust?

(1) water

(2) Air

(3) its open surface

(4) All of the above.

Ans: (4) All of the above.

Q. 3 Rusting is a type of:

(1) Reduction Reaction

(2) Displacement Reaction

(3) Oxidation Reaction

(4) Decomposition Reaction

Ans: (3) Oxidation Reaction

Q. 4 How can items made of iron be prevented from corrosion?

(1) Paint

(2) Oil

(3) Oil paint

(4) All of the above

Ans: (4) All of the above

Q. 5 What is rust primarily composed of?

(1) Hydrated Iron (III) Oxide

(2) Hydrated Iron (II) Oxide

(3) Hydrated Iron (VI) Oxide

(4) Hydrated Iron (IV) Oxide

Ans: (1) Hydrated Iron (III) Oxide

Q. 6 How can iron be protected from corrosion by the application of a layer?

(1) Chromium

(2) Nickel

(3) Zinc

(4) All of the above

Ans: (4) All of the above

Q. 7 Which metal is least prone to corrosion?

(1) Iron

(2) Aluminum

(3) Gold

(4) None of them

Ans: (3) Gold

Q. 8 What is the most suitable method to protect an iron fry pan from rust?

(1) Greasing

(2) Oil Painting

(3) Layer of Zinc

(4) All of the above

Ans: (3) Layer of Zinc

Q. 9 What is the process called when a layer of oxygen forms on the surface of aluminum?

(1) Anodizing

(2) Rusting

(3) Catenation

(4) Galvanization

Ans: (1) Anodizing

Q. 10 What metal is used to create galvanized iron?

(1) Chromium

(2) Nickel

(3) Zinc

(4) Oil

Ans: (3) Zinc