CBSE Class 8 Science - Chemical Effects of Electric Current (5)
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Q1. Do liquids also conduct electricity? Name two liquids which conduct electricity &
two liquids which do not conduct electricity.
Q2. Name a device which glows even when a weak electric current passes through it.
Q3. Write full form of LED.
Q4. Which effect of electric current is utilized for detecting the flow of current
through a solution:
a) When a torch bulb is used?
b) When a compass is used?
Q5. Is it safe for the electrician to carry out electrical repairs outdoors during heavy
Q6. When electric current is passed through acidified water, then hydrogen & oxygen
are formed. What type of effect of current is illustrated by this statement?
Q7. State some of the characteristics of chemical changes brought about by the
chemical effect of electric current.
Q8. Name the metal which is usually electroplated on car parts such as bumpers &
bicycle handlebars made of steel.
Q9. An iron key is to be electroplated with copper. Draw a labeled sketch of the
experimental set up used for this purpose.
Q10. Name two metals which are usually electroplated on cheaper metals for making
jewellery (or ornaments).
Q11. You are required to do electroplating of copper on an iron object. Name the
positive electrode (anode) & the electrolyte you will use for this purpose.
Q12. Write a short note on electroplating.
Q13. Why does compass needle show more deflection when you test sea water,
compared to ordinary water?
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