Application of Electroplating

Q.

Find out the health concerns associated with chromium electroplating. How are people trying to resolve them?

Q. Zinc-coated iron is used in the design of automobiles because:

1. Zinc can be coated onto iron easier than other metals.
2. It makes the automobile lighter in weight.
3. Zinc is abundantly available than any other metal.
4. It is more resistant to corrosion.

Q. Electroplating is used to protect an inferior metal by coating it with a superior metal.

1. True
2. False

Q.

Q) Instead of taking the trouble of electroplating metals with chromium for making car parts , taps , cycle parts , etc., why are these objects not made up of chromium itself ?

A) This is because chromium is a very expensive metals . It is a metal which does not rust is resistant from scratches and has a shiny appearance . If we use chromium it will be a huge loss and it also be wastage of the resource chromium thus it is preferable to use chromium only for electroplating objects.

Could you please check my answer and give inputs.

Q. Machinery parts are often coated with ________ to protect them from corrosion.

1. iron
2. copper
3. chromium
4. nickel

Q. A bulb is observed to glow when lemon juice is used as an electrolyte in a circuit. Why does it seem to glow dimmer, when honey is added to it?

1. Charges in lemon juice get absorbed by honey
2. Addition of honey increases conductivity
3. Charges in honey get absorbed by lemon juice
4. Addition of honey decreases conductivity

Q. What are the requirements for fine coating​ in electroplating process?​[4 marks]

Q.

How do jewellers make less expensive metal ornaments look more expensive?

Q. Processed foods are stored in _____ cans.

1. copper-coated aluminium
2. iron-coated tin
3. tin-coated iron
4. zinc-coated iron

Q.

What causes an inductor to fail?

Q. Electroplating is used in _______________.

1. ornamentation
2. protecting metals from corrosion
3. repairing worn out parts of machinery
4. All of the above.

Q. Question 8 (iv)
Fill in the blanks.
(d) Electroplating of ___ is done on objects like water taps and cycle bell to give them a shiny appearance.

Q. Machinery parts are often coated with ________ to protect them from corrosion.

1. copper
2. gold
3. silver
4. chromium

Q.

Give an example of a monovalent metal used in electroplating

Q. aqueous solution of which compound is the best conductor of electric current?
hydrochloric acid or acetic acid?✋✌✊👌

Q. A bulb is observed to glow when lemon juice is used as an electrolyte in a circuit. Why does it seem to glow dimmer, when honey is added to it?

1. Addition of honey increases conductivity
2. Charges in honey get absorbed by lemon juice
3. Addition of honey decreases conductivity
4. Charges in lemon juice get absorbed by honey

Q. Which of the folowing is not an application of electroplating?

1. Make objects appear shiny
2. Prevent corrosion
3. Keep food intact in metal cans
4. To neutralise the charges on the surface

Q. We get some items made from iron wire in which iron wire is coated with plastic. Is plastic coated by the process of electroplating? Why cant plastic be coated on a metal by the process of electroplating? [2.5 marks]

Q.

Electrolytic deposition of a superior metal on a baser metal.

Q. Soft drink cans as shown below are usually electroplated with tin because :

1. Tin is less reactive compared to the base metal with which the can is made.
2. Tin is less expensive compared to other metals
3. Tin is stronger and shiny in appearance
4. Tin is more reactive than other metals that can be used

Q. List four uses of electroplating, giving the reason for electroplating in each case.

Q. A thin layer of zinc is deposited on a metal to ___________.

1. change its colour
2. prevent corrosion
3. change the shape
4. make the object appear rusty

Q. Which of the following is not an application of electrolysis?

1. Water purification
2. Metal extraction
3. Electroplating
4. Electrorefining

Q. Why are tin-coated iron containers preferred over the iron containers for storing food?

1. Tin is easily available as compared to iron.
2. Compared to iron, tin is less reactive.
3. Tin is cheaper than iron.
4. Tin is a better heat conductor than iron.

Q. Why are tin cans used for storing food made by electroplating tin onto iron?

1. Tin reacts with food and food is protected from getting spoilt.
2. Food does not get spoilt as it does not come in contact with iron which is more reactive.
3. Tin is more reactive than iron and it acts as a preservative.
4. Iron reacts with tin to form a stable compound.