AP ECET CHEMISTRY Multiple Choice Questions (MCQs)
AP ECET Chemistry - Corrosion MCQs
91. What is corrosion?
- a) Process of melting
- b) Process of oxidation of metals
- c) Process of metal bonding
- d) Process of solidification
Answer: b) Process of oxidation of metals
92. Which of the following is a factor influencing corrosion?
- a) Temperature
- b) Humidity
- c) Presence of salts
- d) All of the above
Answer: d) All of the above
93. According to the electrochemical theory, corrosion occurs when:
- a) A metal reacts with oxygen in the air
- b) A metal reacts with water
- c) There is an electrochemical reaction on the surface of the metal
- d) A metal becomes brittle
Answer: c) There is an electrochemical reaction on the surface of the metal
94. Which type of corrosion occurs due to differences in the concentration of ions on different parts of a metal surface?
- a) Stress corrosion
- b) Galvanic corrosion
- c) Concentration cell corrosion
- d) Pitting corrosion
Answer: c) Concentration cell corrosion
95. In the electrochemical theory of corrosion, the metal acts as:
- a) A cathode
- b) An anode
- c) A neutral body
- d) A non-reactive surface
Answer: b) An anode
96. The rusting of iron is primarily due to the reaction with:
- a) Water
- b) Oxygen
- c) Carbon dioxide
- d) Both a and b
Answer: d) Both a and b
97. Which of the following is not a type of electrochemical corrosion cell?
- a) Composition cell
- b) Stress cell
- c) Concentration cell
- d) Temperature cell
Answer: d) Temperature cell
98. Which method prevents corrosion by forming a protective layer over the metal surface?
- a) Cathodic protection
- b) Coating methods
- c) Sacrificial anode
- d) Passivation
Answer: b) Coating methods
99. In cathodic protection, which of the following is used as the sacrificial anode?
- a) Zinc
- b) Copper
- c) Iron
- d) Silver
Answer: a) Zinc
100. Which of the following is a method of cathodic protection where an external voltage is applied to prevent corrosion?
- a) Sacrificial method
- b) Impressed voltage method
- c) Coating method
- d) Oxidation method
Answer: b) Impressed voltage method
101. What happens during the rusting of iron in the presence of water and oxygen?
- a) The iron loses electrons and forms iron ions
- b) The iron gains electrons and forms iron ions
- c) The iron undergoes reduction
- d) No chemical change occurs
Answer: a) The iron loses electrons and forms iron ions
102. Which of the following metals is often used as a sacrificial anode to protect iron from corrosion?
- a) Lead
- b) Zinc
- c) Copper
- d) Tin
Answer: b) Zinc
103. What is the primary component of rust formed during the rusting of iron?
- a) Iron hydroxide
- b) Iron oxide
- c) Iron sulfate
- d) Iron carbonate
Answer: b) Iron oxide
104. Which of the following best describes the mechanism of corrosion in iron?
- a) Only the outer layer reacts with oxygen
- b) Oxygen and water react with iron to form rust
- c) Iron atoms undergo crystallization to prevent rusting
- d) Iron gets reduced by water
Answer: b) Oxygen and water react with iron to form rust
105. Which of the following is a method to prevent corrosion by forming a thin protective film on the metal surface?
- a) Anodization
- b) Painting
- c) Galvanization
- d) All of the above
Answer: d) All of the above
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