(a) Two electrolytic cells containing silver nitrate solution and d...

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(a) Two electrolytic cells containing silver nitrate solution and dilute sulphuric acid solution were connected in series. A steady current of \( 2.5 \mathrm{amp} \) was passed through them till \( 1.078 \mathrm{~g} \) of silver was deposited \( \left[\mathrm{Ag}=107.8 \mathrm{~g} \mathrm{~mol}^{-1}, \mathrm{IF}=96,500 \mathrm{C}\right] \)
(i) How much electricity was consumed.
(ii) What was the weight of oxygen gas liberated.
(b) Give reasons
(i) Rusting of iron pipe can be prevented by joining it with a piece of magnesium.
(ii) Conductivity of an electrolyte solution decreases with the decrease in concentration.
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