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(a) Which one of the following compounds; Urea, ammonia, sugar and copper (II) chloride will conduct an electric
current when dissolved in water? Give a reason.
(b) The diagram below shows an electrochemical cell. Study it and answer the questions that follow. Given the following:
#Fe^(2+)# (aq) +2e→Fe(s);Eθ= -0.44V
#Zn^(2+)# (aq)+2e→Zn(s);Eθ= -0.76V
(i) Show on the diagram using an arrow, the direction of flow of electrons.
(ii) Name two substances that are used to fill the part labeled L.
(c) In an experiment of electroplate iron with silver, a current of 0.5 amperes was passed through a solution of
silver nitrate for one hour.
(i) Give two reasons why it is necessary to electroplate iron with silver.
(ii) Calculate the mass of silver that was deposited on iron (Ag=108, 1 Faraday= 96,500coulombs).