Electroplating

Q.

What is an electrode?

Q.

What happens when copper vessel is exposed to moist air for long time?

Q.

Why do we use chromium metal for electroplating over objects made of cheaper metals?
[2 MARKS]

Q.

What is meant by tinning? What is the advantage of tinning?

Q. Which is the electrolyte used in gold plating.

Q.

Question 1 (c)
Fill in the blank.

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

Q.

Question 12

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?

Q.

Why do we add a few drops of dilute sulphuric acid to copper sulphate solution during electroplating?

1. To increase the temperature of the solution
2. To increase conductivity of the solution
3. To decrease acidity of the solution
4. To decrease conductivity of the solution

Q. Give the name of an electrolyte used in battery

Q.

When current is passed through Copper Sulphate solution, Copper sulphate dissociates into copper and sulphate.This free copper deposits on one of the electrodes.What about the loss of copper in the solution?

Q.

Does temperature affect rate of electrolysis ?

Q.

A solution of Silver nitrate is a good electrolyte but is not used for electroplating an article with silver. Why?

Q.

71. Write a short note on rusting. What are the causes and effects of it? Explain different methods adopted to prevent rusting.

Q.

Give one example of the chemical effect of electric current.

Q.

Explain the construction and working of a voltaic cell.

Q.

Electroplating is a process of depositing a layer of any desired metal on another material with or without using electricity.

1. True

2. False

Q. Is mercury an electrolyte and why

Q.

Name two metal objects which have a coating of another metal.

Q.

Deposition of the metal takes place on which electrode during electroplating?

1. It is deposited at the electrode connected to the positive terminal of battery.

2. It is deposited at the electrode connected to the negative terminal of battery.

3. It depends on the concentration of the solution.

4. It is deposited at both the electrodes.

Q.

(a) What is meant by electroplating? What is the purpose of electroplating?
(b) Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?

Q.

State two ways to prevent the rusting of iron.

Q.

In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as an electrolyte :
(a) Which electrode is connected to the positive terminal of the battery ?
(b) Which electrode is connected to the negative terminal of the battery ?
(c) Which metal salt solution is taken as electrolyte ?

Q. how is the loss of copper ions from copper sulphate solution compenstated

Q.

Question 1 (d)
Fill in the blank.
The process of depositing a layer of any desired metal on another material by means of electricity is called ________.

Q. When electrodes are immersed in water and electricity is passed, the bubbles formed on the negative terminal is _________ gas.​

1. hydrogen
2. carbon dioxide​
3. nitrogen​
4. oxygen​

Q.

Paheli wants to deposit silver on an iron spoon. She took a silver nitrate (${\mathrm{AgNO}}_3$) solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?

Q. Define the following terms:
1. Electrolyte.
2. Electrode.
3. Electrolytic cell.
4. Electrolysis.
5. Electroplating.

Please give fast it's really very urgent.

Q. Avinash wants to electroplate a copper plate with zinc. He uses an arrangement as shown in the figure. Select the correct combination of electrodes and electrolyte.

1. A: Copper plate, B: Zinc plate, C: Copper sulphate solution
2. A: Zinc plate, B: Copper plate, C: Zinc sulphate solution
3. A: Zinc plate, B: Copper plate, C: Copper sulphate solution
4. A: Copper plate, B: Zinc plate, C: Zinc sulphate solution

Q.

What are the conditions for good electroplating?

1. A direct current is to be used.

2. A low current for a longer time is to be used.

3. The article to be electroplated should be cleaned thoroughly.

4. The electrolyte must have a high concentration of the metal ions to be deposited on the article.

Q.

The object to be electroplated is taken as ____________ electrode.