CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

Electrolysis of dilute LiOH solution using platinum electrodes is carried out. Choose the correct option:

A
H2 is evolved at cathode
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
H2 is evolved at anode
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Li metal is obtained at cathode
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Both (b) and (c)
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A H2 is evolved at cathode
On electrolysis of aqueous LiOH solution, water (H2O) reduces to H2 and gets liberated at cathode.

Li+(aq)+eLi(s)
E0Li+/Li=3.04 V

2H2O(l)+2eH2(g)+2OH(aq)
E0H2O/H2=0.83 V

This is because of the higher reduction potential of water than Li+.
Cell reaction:

At cathode: 2H2O(l)+2eH2(g)+2OH(aq)
At anode: 2H2O(l)4H+(aq)+O2(g)+4e
E0H2O/O2=1.23 V

flag
Suggest Corrections
thumbs-up
0
BNAT
mid-banner-image