Q. The platinum electrodes were immersed in a solution of cupric sulphate and electric current was passed through the solution. After some time, it was found that colour of copper sulphate disappeared with evolution of gas at the electrode. The colourless solution contain
A) Copper sulphate
B) Copper hydroxide
C) Platinum sulphate
D) Sulphuric acid
Explanation
(d)
During electrolysis of ${CuSO}_{4},\ {Cu}^{2 +}$ gets discharged at cathode and ${OH}^{-}$ at anode. Thus, solution becomes acidic due to excess of $H^{+}$ and ${SO}_{4}^{2 -}\$or$\ H_{2}{SO}_{4}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.