Electroplating

Q.

Corrosion is an example of ___ (redox/reduction/physical) reaction.

Q.

Rusting of iron cannot be prevented by which of the following methods?

1. Galvanizing
2. All of the above
3. Reacting with non-metal
4. Chrome plating

Q.

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time.

1. True

2. False

Q. Why does clean copper, after being dipped in acetic acid + common salt, acquire a greenish-blue layer after it is dried with a tissue? Write the compound formed, it's chemical formula and the chemical and word equation.

Q.

What do you understand by the term electroplating?

Q.

What is the purpose of electroplating?

1. To apply a coating of a metal that is normally too reactive to use commercially.

2. To apply a coating of a cheap metal to protect an expensive metal.

3. To always produce a cheaper metal article.

4. To apply an even, thin layer of one metal over another metal.

Q. Which of these cannot be used to prevent rusting of iron?

1. Galvanizing
2. Painting
3. Oiling
4. Watering

Q.

Chemical effect of electric current is primarily used for which of the following?

1. Separating hydrogen

2. Separating gold

3. Separating oxygen

4. Electroplating

Q. What is the difference between galvanisation and electroplating

Q. Two conducting poles through which an electric current enters or leaves an electrolyte are called __________.

1. cathode
2. anode
3. electrodes
4. conductors

Q.

Which of the following metals cannot be used to be electroplated on the surface of another metal using an aqueous electrolyte?

1. Copper

2. Silver

3. Magnesium

4. Nickel

Q. Which of the following can be used as an electrolyte during copper plating?

1. Hydrochloric acid
2. Iron sulphate
3. Copper sulphate
4. Sodium chloride

Q.

Silver plated vessels and gold plated ornaments are made by _________ method.

1. Electroplating

2. Anodizing

3. Galvanizing

4. Tinning

Q.

What is the process of putting a thin layer of superior metal over an inferior metal known as?

Payal is a teenager who does not want to waste too much money on jewelry. what kind of jewelry would you recommend to her?

Q.

Bad taste and smell of stale food is because of:

1. Corrosion

2. Displacement

3. Heating

4. Rancidity

Q.

Electroplating is an electrochemical reaction.

1. True

2. False

Q.

Assertion: Upal observed that copper is deposited on the negative electrode connected to the terminal of the battery. Kavya performed the same experiment but she replaced the copper electrode with a carbon electrode and still observed copper is deposited over carbon rod.

Reason: Copper sulphate solution dissociates into copper and sulphate ions when electricity is passed through dilute copper sulphate solution and this free copper ions deposit on the carbon rod.

1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

3. Assertion is true but the Reason is false.

4. The statement of the Assertion is false but the Reason is true.

Q. Which two species are the anions in copper sulphate solution?

1. Sulphate ion and hydroxide ion
2. Hydrogen ion and sulphate ion
3. Copper ion and sulphate ion
4. Copper ion and hydrogen ion

Q.

Which of the following metallic electrodes does not take part in an electrolytic reaction?

1. Fe

2. Cu

3. Ag

4. Ni

Q.

Some stale food give a bad taste and a bad smell because of:

1. Corrosion

2. Displacement

3. Heating

4. Rancidity

Q.

Give one word for the following statement

Electrolytic deposition of a superior metal on a base metal?

Q. The process of electroplating involves a/an reaction.

1. electrochemical
2. photochemical
3. thermochemical

Q.

Which of the following is an active electrode?

1. Copper

2. Graphite

3. Platinum

4. Hydrogen

Q. When an aqueous solution conducts electricity always there is-

1. no gas produced at one electrode
2. evidence of a chemical change
3. a metal deposited at cathode
4. hydrogen or oxygen gas produced

Q.

Kavita wants to deposit silver on an iron spoon. She took silver nitrate ($AgN{O}_3$) solution in a beaker and connects iron spoon to (X) terminal of the battery and another material (Y) is connected to the second terminal of the battery. Identify (X) and (Y) from the given options.

1. X:- Positive

   Y:- Silver

2. X:- Negative

   Y:- Silver

3. X:- Positive

   Y:- Iron

4. X:- Negative

   Y:- Iron

Q. Compounds that act as electrolyte in the process of electrolysis should be ionic in nature.

1. True
2. False

Q.

To electroplate an article with nickel requires an electrolyte which must be a solution containing ___________ ions.

Q. If expose copper in water for a long time will it react with it

Q.

Silver is more likely to tarnish now than it would have 500 years ago. Explain.

Q.

Define the following term:

Non- electrolyte.