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14. Chemical Effects of Electric Current
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Q65 of 76 Page 272

If plus sign (+) denotes the positive electrode and minus sign (-) denotes the negative electrode, then which of the following statement is correct for an iron spoon to be copper-plated ?

Copper plate(+), Iron spoon(-), Copper sulphate electrolyte is the correct setup combination for electroplating. Because the anode is made the metal to be deposited and cathode to the one on which it is electroplated.

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63

The process of purification of an impure metal is like:

64

The device which can be used to detect very small current flowing in an electric circuit is:

66

A student staying in a coastal region tests the drinking water and also the sea water 'With a circuit in which a part of the connecting wire is wound around a matchbox containing compass. He finds that the compass needle deflects more in the case of sea water. Can you explain the reason?

67

When an electric current is passed through a cut potato for a considerable time, a coloured spot is formed around one of the electrodes :

(a) What is the colour of the spot?


(b) Around which electrode (positive or negative electrode) the coloured spot is formed?


(c) Which effect of electric current is involved in this case?

Questions · 76
14. Chemical Effects of Electric Current
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