Q10 of 24 Page 79

Will the solution of sugar in distilled water conduct electricity?

No, the solution of sugar in distilled water will not conduct electricity because sugar dissolves completely in water and no formation of ions takes place. Sugar is neither acidic or basic solution and hence a poor conductor of electricity.


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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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Why is a layer of zinc coated over iron?

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

 12

Boojho made the circuit given in Fig. 14.3 and observed that the bulb did not glow. On Paheli’s suggestion he added one more cell in the circuit. The bulb now glows. Explain.