MCQs — Electrochemistry

Practice questions for Chemistry.

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Question 141

Galvanizing is the process of coating iron with a thin layer of:

A. Copper

B. Zinc

C. Silver

D. Gold

Question 142

In the galvanizing process, a clean iron sheet is dipped into a hot bath of:

A. Molten tin

B. Zinc chloride, then rolled into a zinc bath and cooled

C. Pure water

D. Liquid nitrogen

Question 143

Electroplating uses which type of process to deposit one metal onto another?

A. A purely mechanical process

B. An electrolytic process

C. A thermal decomposition process

D. A distillation process

Question 144

What is the essential difference between coating a metal with paint and coating it with a thin layer of another metal (as in tinning, galvanizing, or electroplating)?

A. There is no real difference between the two approaches

B. Paint forms a non-metallic barrier layer, whereas tinning/galvanizing/electroplating deposit an actual protective metal layer onto the surface

C. Paint can only be used on non-metal surfaces

D. Metal coatings always corrode faster than paint

Question 145

Cathodic protection is also known as:

A. Anodic protection

B. Sacrificial protection

C. Thermal protection

D. Chemical neutralization

Question 146

In cathodic protection, the metal to be protected from corrosion is made the:

A. Anode

B. Cathode

C. Electrolyte

D. Insulator

Question 147

In cathodic protection, the metal being protected is connected to a more chemically active metal, such as magnesium or aluminium, which then acts as the:

A. Cathode

B. Anode

C. Electrolyte

D. Catalyst

Question 148

Why does the more active metal (such as magnesium) oxidize itself instead of the iron it is protecting, in cathodic protection?

A. Because the more active metal loses electrons more readily than iron, so it preferentially undergoes oxidation, effectively sacrificing itself to spare the iron

B. Because magnesium is completely unreactive and cannot be oxidized at all

C. Because iron always oxidizes first, regardless of what metal it is connected to

D. Because the connection has no actual chemical effect

Question 149

Cathodic protection is commonly employed to prevent corrosion of iron and steel structures such as pipes, tanks, and oil rigs, especially in which type of environment?

A. Dry, desert environments only

B. Moist, underground, or marine environments

C. High-altitude, low-humidity environments

D. Sealed, vacuum environments

Question 150

Large bars of a specific metal are commonly attached below a ship's water line to protect its steel hull from rusting, using cathodic (sacrificial) protection. This metal is:

A. Copper

B. Magnesium

C. Gold

D. Lead

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