Tag: electroplating

Questions Related to electroplating

If $Zn/Zn^{+2}$ electrode is diluted 100 times then the change in electromotive force will be :-

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. increases of 59 mV

  2. decreases of 59 mV

  3. increases of 29.5 mV

  4. decreases of 29.5 mV

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Correct Option: A

The process of depositing thin layer of a metal over an another metal with a help of electric current is called :

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. electrorefining

  2. electroplating

  3. thermoplating

  4. none of the above

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Correct Option: B
Explanation:

Electroplating is the process of plating one metal onto another, for decorative purposes or to prevent corrosion of a metal. 

Which pair of electrolytes could not be distinguished by the products of electrolysis using inert electrodes.

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

  1. $\text{1M CuSO} _4$ solution, $\text{1M CuCl} _2$ solution

  2. $\text{1M KCl}$ solution, $\text{1M Kl}$ solution

  3. $\text{1M AgNO} _3$ solution, $\text{1M Cu(NO} _3) _2$ solution

  4. $\text{1M KCl}$ solution, $\text{1M NaCl}$ solution

  5. $\text{1M CuBr} _2$ solution, $\text{1M CuSO} _4$ solution

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Correct Option: A

Calculate the half cell potential at $298$K for the reactoin ,Zn$^{+2}$ + $2$e$^{-}$ $\rightarrow$ Zn if [Zn$^{+2}$] =$2$M,
E$^{o}$$ _{Zn^{+2}/Zn}$ =-$0.76$V

E$^{o}$



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

  1. -$0.90$ V

  2. -$0.75$ V

  3. A and B

  4. None of these

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Correct Option: B

The volume of gases evolved at STP by passing 0.1 ampere of current 49 65 seconds to 1 aqua solution of potassium?

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

  1. 22.4

  2. 11.2

  3. 89.6

  4. 44.8

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Correct Option: B

On passing one friday of electric charge through a dilute solution of an acid, the volume of hydrogen obtained at S.T.P. is :

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

  1. 22400 ML.

  2. 1120 mL

  3. 2240 mL

  4. 11200 ML.

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Correct Option: D

Electrolysis rules of Faraday's states that mass depends on electrodes is proportional to:-

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

  1. $m \propto I^2$

  2. $m \propto Q$

  3. $m \propto Q^2$

  4. None of these

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Correct Option: B

The process of electrolysis is used in:

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

  1. extraction of metals

  2. electroplating

  3. refining of metals

  4. all of the above

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Correct Option: D
Explanation:

Answer is D.
Electrolysis has wide applications in industries. Some of the important applications are, as follows, 
(i) Production of hydrogen by electrolysis of water. 
(ii) Manufacture of heavy water. 
(iii) The metals like K, Mg, Al, etc., are obtained by electrolysis of fused electrolytes. 
(iv) Non-metals like hydrogen, fluorine, chlorine are obtained by electrolysis. 
(v) In this method pure metal is deposited at cathode from a solution containing the metal ions, etc. 
(vi) Compounds like NaOH, KOH, white lead, etc. are synthesised by electrosynthesis method.
(vii) Electroplating: The process of coating an inferior metal with a superior metal by electrolysis is known as electroplating. 
Hence, the options A, B and C are correct.

Electromeric effect involves the completer transfer of 

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

  1. $\sigma $ electorn

  2. $\pi $ electron

  3. proton

  4. Both $\sigma $ and $\pi $ electrons

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Correct Option: B

Refining an impure metal to give a pure metal is known as:

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

  1. electro-refining

  2. electrode refining

  3. electroplating

  4. none of the above

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Correct Option: A
Explanation:

Refining an impure metal to give a pure metal is known as electrorefining.