Chemistry
Select the correct answer — A compound which during electrolysis in it's molten state liberates a reddish brown gas at the anode :
- Sodium chloride
- Copper (II) oxide
- Copper (II) sulphate
- Lead (II) bromide
Electrolysis
38 Likes
Answer
Lead (II) bromide
Reason — During electrolysis of Lead [II] bromide, Br-1 ions are discharged at the anode. Reddish brown fumes are due to bromine vapours.
Answered By
22 Likes
Related Questions
A, B and C are three electrolytic cells, connected in different circuits. Cell 'A' contains NaCl soln., and the bulb in the circuit glows brightly, when the circuit is completed. Cell 'B' contains acetic acid and the bulb glows dimly. Cell 'C' contains sugar soln., and the bulb does not glow. Give reasons for each observation.
Aqueous solution of nickel sulphate contains Ni2+ and SO42- ions
(i) Which ion moves towards the cathode?
(ii) What is the product at the anode?
A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide.
(i) What kind of salt is sodium argentocyanide.
(ii) Why is it preferred to silver nitrate as an electrolyte?
(iii) State one condition to ensure that the deposit is smooth, firm and long lasting.
(iv) Write the reaction taking place at the cathode.
(v) Write the reaction taking place at the anode.
During electroplating of an article with nickel —
(i) Name — (a) The electrolyte (b) The cathode (c) The anode
(ii) Give the reaction of the electrolysis at (a) The cathode (b) The anode