7. What is electroplating? Write any four applications of electroplating.
8. Write down the important points, which should be remembered while electroplating.
9. Explain the method of copper plating an iron spoon/nail.
10. 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?
11. Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handle etc., which are made of iron?
12. Draw a schematic diagram of the step-up for electrorefining copper.
13. Explain the structure of a dry cell with the help of a well labelled diagram.
14. Sea water is a better conductor of electricity than
tap water. Why?
please tell me all th answers
Answers
Answer:the process of coating the thin layer of metals with desired metal to resist from rust is called electroplating. 1-Tin cans used for storing food are made by electroplating tin metal on to iron. 2-it is used in bicycle to resist rust or corrosion. ... 4-it is used in LPG stoves to resist rust.
Explanation:
Answer:
7.coat (a metal object) by electrolytic deposition with chromium, silver, or another metal.
Electroplating is widely used in numerous sectors for coating metal objects with a thin layer of a different metal. The added metal has a desired property the original object lacks and is primarily used to improve corrosion resistance. Chromium plating is a great example.\
8.)1. the metal article on electroplating is o be done should made the negative electrode.so it is connected to negative terminal of battery. 2. the metal to be deposited should be made the positive electrode.
9.)A thin sheet of pure copper is made anode. An acidified solution of copper sulphate is used as the electrolytic solution. When electricity is passed through copper sulphate solution, the copper metal gets electroplated on the iron spoon.
10)a)anode
b)Copper sulphate solution
c)Copper sulphate solution
11) i)Chromium has a good shine
ii)Chromium resists scratches
14)Sea water has a relatively large number of Sodium and Chloride ions and has a conductivity. This is because the Sodium Chloride salt dissociates into ions. Hence sea water is about a million times more conductive than fresh water.
Explanation:
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