Corrosion and Electroplating Quiz

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What is the primary benefit of removing stains from iron?

Increases aesthetic appeal

Enhances mechanical strength

Prevents corrosion (correct)

Improves conductivity

What role do modern paints play in corrosion prevention?

They facilitate rust formation

They absorb moisture to prevent rust

They contain chemicals that protect against corrosion (correct)

They act as insulators

Which of the following is an example of an alloying technique that prevents rust?

Tin wrapping

Chromium and nickel alloying (correct)

Zinc plating

Aluminum coating

What is the purpose of a metallic coating on iron?

To prevent against corrosive conditions Signup and view all the answers

What process is involved in galvanizing iron?

Applying a layer of zinc Signup and view all the answers

What occurs at the anode during the electroplating of silver?

Silver rod dissolves to produce Ag+ ions. Signup and view all the answers

Which ions are reduced and deposited at the cathode during the electroplating of chromium?

Cr3+ ions Signup and view all the answers

Which metal is used as an anode for chromium electroplating?

Antimonial-lead Signup and view all the answers

What is the primary condition necessary for the rusting of iron to occur?

Moist air Signup and view all the answers

Why is steel often plated with nickel before chromium?

For better adhesion and corrosion resistance. Signup and view all the answers

Which of the following is not a common example of silver plating?

Electrical wires Signup and view all the answers

In the rusting process, what constitutes the anodic region?

The area with stains and dents Signup and view all the answers

Which reaction takes place at the anodic region during the rusting of iron?

Oxidation of iron Signup and view all the answers

What is formed as a result of the overall redox process during rusting?

Fe2O3·nH2O Signup and view all the answers

How does the presence of carbonic acid affect the rusting process?

It provides H+ ions that accelerate rusting Signup and view all the answers

Why does the rust layer not prevent further corrosion of iron?

It is porous Signup and view all the answers

What role do electrons play in the rusting of iron?

Electrons facilitate the oxidation of iron Signup and view all the answers

Which of the following statements is NOT a condition for rusting?

Iron is submerged in pure water Signup and view all the answers

What is used to remove rust or surface scales from the target metal before electroplating?

Alkaline detergent solutions and acid Signup and view all the answers

In tin electroplating, which component acts as the anode?

Tin metal electrode Signup and view all the answers

What happens to copper atoms at the anode during electrolytic refining of copper?

They dissolve into solution as copper ions ($Cu^{2+}$) Signup and view all the answers

Which solution is used as an electrolyte in the electrolytic refining of copper?

Copper sulphate solution in water Signup and view all the answers

What is the role of the electric current in the electroplating process?

To deposit the metal onto the substrate Signup and view all the answers

What is the primary purpose of tin coating on iron sheets?

To provide a protective layer against rust Signup and view all the answers

Which process is used in electroplating?

Depositing one metal over another using electrolysis Signup and view all the answers

In the electroplating process, what role does the anode play?

It is the source of metal ions for deposition Signup and view all the answers

What happens to tin-coated iron when the tin layer is damaged?

It rusts rapidly due to exposure to air and water Signup and view all the answers

Which of the following is the first step in the electroplating procedure?

Cleaning the object to be plated Signup and view all the answers

What type of solution is typically used in the electrolytic process for electroplating?

A saline solution of the metal's salt Signup and view all the answers

Which of the following metals is commonly used as an anode in silver electroplating?

Silver Signup and view all the answers

Why is it important to keep the tin layer intact on coated iron sheets?

To prevent exposure to oxidation Signup and view all the answers