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NCERT Solutions for Class 8th Science

 

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Chapter 14. Chemical Effects of Electric Current

Chapter Review

 

 

 

Chapter Review:

  • The passage of an electric currernt through a conducting liquid causes chemical reaction. The resulting effects are called  chemical effects of currents. 
  • Which allow electric current to pass through them, are good conductors of electricity.

  • Which do not allow electric current to pass through them easily, are poor conductors of electricity.

  • Most liquids that conduct electricity are solutions of acids, bases and salts.

  • Two wires are called leads.

  • Distilled water is free of salts and is a poor conductor.

  • When salt is dissolved in distilled water, we obtain salt solution. This is a conductor of electricity.

  • Oxygen bubbles formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles formed on the other electrode.

  • The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. 

  • Chromium has a shiny appearance. It does not corrode. It resists scratches.

 

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