Tag: electroplating

Questions Related to electroplating

Galvanization of iron denotes coating with:

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. copper

  2. aluminium

  3. silver

  4. none of the above

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Correct Option: D
Explanation:

Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. Galvanization of Iron meaning coating with zinc.


It forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed iron will still be protected by the remaining zinc.

Which of the following is not an electrochemical process?

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. Transmission of nerve impulses in human body

  2. Rusting of iron

  3. Lightning

  4. None of the above

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Correct Option: C
Explanation:

Both transmission of nerve impulse and  rusting of iron are results of electrochemical reactions.In transmission of nerve impulse numerous small molecules function as neurotransmitters at various chemical synapses.Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Lightning is a sudden electrostatic discharge during an electrical storm between electrically charged regions of a cloud. 

Galvanized iron sheets are coated with :

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. copper

  2. nickel

  3. zinc

  4. carbon

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Correct Option: C
Explanation:

Galvanization is the process of applying a protective zinc coating to steel or iron in order to prevent it from rusting.

Electro refining which is based on phenomenon of Electrolysis where:

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. impure metal is made anode and pure metal is cathode

  2. impure metal is cathode and pure metal is anode

  3. pure metal makes both anode and cathode

  4. none of the above

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Correct Option: A
Explanation:

This method is based upon the phenomenon of electrolysis. The crude metal is made anode whereas the thin sheet of a pure metal is made cathode. The electrolyte is the solution of the soluble salt of the same metal, preferably a double salt on passing electricity the metal from anode goes into solutions as ions due to oxidation while the pure metal gets deposited at the cathode due to the reduction of metal ions the impurities settle down below the anode as Anode Mud.

State True or False:
Rusting of iron is a physical change.

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. True

  2. False

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Correct Option: B

Which of the following is the preferred electrolyte for silver plating?

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. $AgCl+HCl$

  2. $Ag{NO} _{3}+H{NO} _{3}$

  3. ${Ag} _{2}{SO} _{4}$

  4. $AgCN+NaCN$

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Correct Option: D
Explanation:

Silver plating is an electroplating process utilizing an electrolyte containing silver cyanide solution and some free cyanide ions and operating at pH value not less than $8$. Free cyanide prevents precipitation of silver cyanide salt from the solution, provides electrical conductivity of the electrolyte and helps in the dissolution of silver anodes.

Why is electroplating done?

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. to increase attractiveness

  2. to purify an impure metal

  3. to prevent rusting

  4. all of the above

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Correct Option: A,C

Electroplating is a process of deposition of ________ metal on the surface of _________ metal.

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. inferior, superior

  2. superior, superior

  3. inferior, inferior

  4. superior, inferior

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Correct Option: D
Explanation:

Electroplating is a process of deposition of superior metal on the surface of inferior metal.

Anode is the _________ block and cathode is the _________ block in electrorefining of metal.

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. impure, pure

  2. pure, pure

  3. impure, impure

  4. pure, impure

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Correct Option: A
Explanation:

Anode is the impure block and cathode is the pure block in electro-refining of metal.

Electroplating is ________________ of metals and electro-refining is ___________ of metals.

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. depositing, refining

  2. plating, extracting

  3. refining, depositing

  4. none of the above

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Correct Option: A
Explanation:

Electroplating is $depositing$ of metals and electro-refining is $refining$ of metals.