A compound which during electrolysis in its molten state, liberates a reddish brown gas at the anode is _________.
(a) Select the correct answer.
A compound which during electrolysis in its molten state, liberates a reddish brown gas at the anode.
(i) Sodium chloride
(ii) Copper [II] oxide
(iii) Copper [II] sulphate
(iv) Lead [II] bromide
(b) During electroplating of an article with nickel,
A. The electrolyte
B. The cathode
C. The anode
(ii) Give the reaction of the electrolysis at
A. The cathode
B. The anode
(c) A, B and C are three electrolytic cells, connected in different circuits. Cell 'A' contains NaCl soln., and the bulb in the circuit glow brightly, when the circuit is completed. Cell 'B' contains acetic acid and the bulb does not glow. Give reason for each observation.
(a) The observation seen when fused lead bromide is electrolysed is :
(i) A silver grey deposit at an anode and a reddish brown deposit at the cathode.
(ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode.
(iii) A silver grey deposit at the cathode and reddish brown fumes at the anode.
(iv) Silver grey fumes at anode reddish brown fumes at the cathode.
(b) During electroplating an article with silver, the electrolyte used is :
(i) Silver nitrate solution
(ii) Silver cyanide solution
(iii) Sodium argentocyanide solution
(iv) Nickel sulphate solution.
(c) Give one word or phrase for electrolytic deposition of a superior metal on a baser metal.
(d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.
(e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same.
(f) Name the king of particle present in :
(i) Sodium hydroxide soln.
(ii) Carbonic acid
(iii) Sugar soln.
(g) M2O is the oxide of a metal 'M' which is above hydrogen in the activity series. M2O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity.
(i) State the reaction taking place at the cathode
(ii) Name the product at the anode.
(a) State observation at the anode when aqueous copper sulphate solution is electrolysed using copper electrodes.
(b) During electrolysis of molten lead bromide, graphite anode is preferred to other electrodes. Give reason.
(c) Electrolysis of molten lead bromide is considered to be a redox reaction. Give reason.