CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Which of the following will not produce hydrogen gas?


A

Electrolysis of mildly acidified water

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

Electrolysis of NaCl in Nelson's cell

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Reaction of Zn with concentrated H2SO4

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Reaction of Zn with NaOH

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

Reaction of Zn with concentrated H2SO4


Water on electrolysis decomposes into H2 and O2 gases.

In Nelson's cell, aqueous NaCl is electrolyzed where:

The reaction at the cathode is:

H2O(l)+2eH2+2OH
The reaction at the anode is:

Cl12Cl2(g)+1e

The overall reaction is as follows:

NaCl(aq)+H2O(l)Na+(aq)+OH(aq)+H2(g)+1/2Cl2(g)

Zn on reacting separately with excess dil H2SO4 and excess NaOH liberates H2(g)

Zn+2NaOHNa2ZnO2+H2

Zn+H2SO4(dil.)ZnSO4+H2

But when Zn reacts with concentrated H2SO4,

4Zn+5H2SO4(moderately strong and hot)4ZnSO4+H2S+4H2O

3Zn+4H2SO4(moderately strong and hot)3ZnSO4+S+4H2O

Zn+2H2SO4(conc.)ZnSO4+SO2+2H2O


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Dihydrogen - Preparation Methods; Physical and Chemical Properties; Uses
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon