To electroplate an Iron Strip with copper.
To Identify any two electrolytes and any two non-electrolytes from the list.
Electrolytes Sodium Chloride solution Acidified water caustic soda solution.
Non-Electrolytes Sugar solution, Benzene, Alcohal.
Q.1. Which materials are required in Electroplating experiment?
Ans. The following materials are required in electroplating experiment.
Q.2. Which materials are required in experiment 11(B)?
Ans. The following material is required in experiment 11 (B):
1. Battery
2. Beaker
3. Electrodes
4. Bulb or Galvanometer and connecting wire
Q.3. What is electrolytes?
Ans. The movement of the ions of an electrolyte and their deposition as neutral species at
the electrodes under the influence of electric current is known as Electrolytes..
Q.4. What are the conditions for Electrolysis?
Ans. The electrolytes should be in the form of solution of strong electrolyte. It may also
dissociate in molten or fused state. If the solution is more dilute and the temperature is
higher then the degree of dissociation is greater.
Q.5. What is the name of metallic plates which are placed in the electrolyte?
Ans. The metallic plates are called electrodes.
Q.6. What is the name of the plate connected to positive terminal of the battery?
Ans. It is known as Anode.
Q.7. What is the name of electrode connected to negative terminal of the battery?
Ans. That electrode is called Cathode.
Q.8. Which compound is used as electrolyte in this experiment?
Ans. Copper Sulphate is used as electrolyte in this experiment.
Q.9. To which terminal of the battery the iron strip should be connected?
Ans. Iron strip for electroplating with copper should be connected to negative plate of the
battery.
Q.10. Why do you connect Iron plate to negative plate of the battery?
Ans. As we want to coat Iron plate with copper so it is made negative so that positive
copper ions may deposit on iron strip.
Q.11. What are Electrolytes?
Ans. Electrolytes are the substance which in fused state or in aqueous solution dissociate
into ions and conduct electricity.
Q.12. What are Non-Electrolytes?
Ans. Non-Electrolytes are those substances which in fused state or in aqueous solution do
not dissociate into ions and hence do not conduct electricity.
Q.13. Give some examples of Electrolytes?
Ans. Acids, Bases and Salts are the examples of Electrolytes.
Q.14. Give some examples of Non-Electrolytes?
Ans. Alcohal, Benzene, Sugar Solution, Carbon Disulphate and Carbon Tetrachloride are the
examples of Non-Electrolytes.
Q.15. What is Electroplating?
Ans. Electroplating is a process in which a thin layer of a metal is coated on the other
metal with the help of electric current.
Q.16. What is the purpose of Electroplating?
Ans. The purpose of electroplating is to make the metallic plate shining and durable.
Q.17. Which compounds are Electrolytes and Non-Electrolytes in the following compound?
Ans.
1. Potassium Chloride Solution
2. Sodium Hydroxide Solution
3. Sugar Solution
4. Benzene
5. Hydrochloric Acid
6. Potassium Hydroxide
7. Alcoha
Q.18. What is the formula of Copper Sulphate?
Ans. The formula of Copper Sulphate is CuSO4.5H2O
Q.19. Which chemicals are used in Dry Cell?
Ans. The chemicals which are used in Dry Cell are given below:
1. Ammonium Chloride
2. Zinc Chloride
3. Manganese Dioxide
4. Charcoal
Q.20. Which substance is used as negative electrode in Dry Cell?
Ans. Zinc vessel is used in negative electrode.
Q.21. Which substance is used as positive electrode in Dry Cell?
Ans. Carbon Electrode is used as positive electrode in Dry Cell.
Q.22. Which compound is used as electrolyte in Dry Cell
Ans. Ammonium Chloride solution is used as an electrolyte in Dry Cell.
Q.23. Which chemical compound is used as electrolyte in simple Voltaic Cell?
Ans. Dilute Sulphuric Acid is used as electrolyte.
Q.24. Which substance is used as positive electrode in Voltaic Cell?
Ans. Copper Plate is used as Positive electrode.
Q.25. What are Faraday's Laws of Electrolysis?
Ans. Faraday's Laws of Electrolysis are given below:
First Law The amound of electrolysis which takes place is in exact proportion to the
quantity of electricity which is used in the process.
Second Law Mass of any substance formed by the passage of given amount of electricity
is directly proportional to the equivalent weight of the solution.
Q.26. What is the unit of Charge?
Ans. The unit of Charge is coulomb.
Q.27. Define Coulomb?
Ans. One coulumb is defined as the quantity of electrocity which will deposit 0.00 11180 g
of silver from a solution of Silver Nitrate.
Q.28. What is the unit of Current?
Ans. The unit of current is ampere.
Q.29. What is Ampere?
Ans. A current of one ampere corresponds to the transfer of electricity at a rate of 1
coulomb per second.
Q.30. Define Volt?
Ans. A Volt is the potential difference across the two ends of a wire of one ohm resistance
and in which one ampere current is flowing.
Q.31. Which substance is used as negative electrode in simple Voltaic Cell?
Ans. Zinc plate is used as negative plate in this Cell.
Q.32. Why does the current stop in voltaic cell after some time?
Ans. The current stops after some time due to defect of Polarisation.
Q.33. What is Polarisation?
Ans. Depositing of hydrogen gas on copper plate is known as Polarisation.
Q.34. What is the formula of Sodium Chloride?
Ans. The formula of Sodium Chloride is NaCl.
Q.35. What is the formula of Sodium Hydroxide?
Ans. NaOH.
Q.36. What is the formula of Sugar?
Ans. C12H22O11.
Q.37. What is the formula of Methyl Alcohal?
Ans. CH3OH
Q.38. What is the formula of Ethyl Alcohal?
Ans. C2H5 OH.
'Q.39. What is the formula of Glucose?
Ans. C6H12O6.
Q.40 Is Alcohal an electrolyte?
Ans. No, alcohal is not a electrolyte.
Q.41. What is the formula of Benzene?
Ans. C6H6.
Q.42. Is Benzen an aliphatic or aromatic compound?
Ans. Benzene is an aromatic compound.
Q.43. Why does the current flow through Electrolytes?
Ans. Electrolytes in the form of solution contain positive and negative ions. The ions are
charged particles so they help in the flow of electric current through them.
Q.44. Why does the current not flow through non-electrolytes?
Ans. Non-electrolytes do not break into ions and so they do not allow the flow of electric
current through them.
Q.45. What is an Ion?
Ans. An atom or group of atoms having positive or negative charge is known as Ion.
Q.46. What is Cation?
Ans. Ion Carrying positive charge is called Cation.
Q.47. What is Anion?
Ans. Ion carrying negative charge is called Anion.
Q.48. What are the Strong Electrolytes?
Ans. The compounds which ionize to a large extent in dilute aqueous solutions and therefore conduct electric current to a large extent are called Strong Electrolytes.
Q.49. Give some examples of Strong Electrolytes?
Ans. HCl, NaOH, H2SO4, NaCl are the examples of Strong Electrolytes.
Q.50. What do you understand by Weak Electrolytes?
Ans. The compounds which conduct electric current poorly due to ionization to a small extent in aqueous solutions are called Weak Electrolytes.
Q.51. Give some examples of Weak Electrolytes?
Ans. Acetic Acid, Sodium Carbonate and Calcium Hydroxide are the examples of Weak Electrolytes.
Q.52. Define Faraday?
Ans. The number of coulomb required to liberate 1.008 g of Hydrogen or deposit 31.78 g. of copper is equal to 96500 coulomb. This amount of charge is called a Faraday.
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