Q9 of 24 Page 79

Why is a layer of zinc coated over iron?

Zinc is coated over iron to prevent iron from corrosion. The coating of zinc stops oxygen and water to reach the layer of iron metal.


Also, since zinc is more reactive than iron, therefore it reacts with surroundings and hence prevents iron from depletion.


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7

Which of the following solutions will not make the bulb in Fig 14.2 glow?


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Fill in the blanks

(a) The object to be electroplated is taken as ____________ electrode.


(b) One of the most common applications of chemical effect of electric current is ______________.


(c) Small amount of a mineral salt present naturally in water makes it a______________ of electricity.


(d) Electroplating of ______________ is done on objects like water taps and cycle bell to give them a shiny appearance.


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Will the solution of sugar in distilled water conduct electricity?

 11

Name the effect of current responsible for the glow of the bulb in an electric circuit.