wiz-icon
MyQuestionIcon
MyQuestionIcon
4
You visited us 4 times! Enjoying our articles? Unlock Full Access!
Question

Ozone is estimated in air by passing certain volume of air through an acidified or neutral or basic KI solution when O2 is evolved and I is oxidised to I2. Free I2 evolved is titrated with standard Na2S2O3 solution. In an experiment, 10 L of air at 1 atm and 27oC was passed through an alkaline KI solution and I2 liberated required 2 mL of M800 Na2S2O3 solution. The volume percentage of O3 in sample is :

A
2.463×103%
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
2.563×103%
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
2.473×103%
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
none of the above
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 2.463×103%
The balanced redox reactions in basic medium are as follows:
2I+H2O+O3O2+I2+2OH (n factor O3=2)
I2+2e2I(n=2)
S2O23+10OH2SO24+5H2O+8e(n=8)
mEq of I2=mEq of Na2S2O3
2×1800×8 (n factor) =0.02
mmoles of I2=0.022= mmoles of O3
[n=2, for both or, Molar ratio of O3:I2::1:1]
PO3=nRTV
=0.01×103×0.0821×30010 =246.3×107atm
Volume % of O3=246.3×107atm =2.463×103%

flag
Suggest Corrections
thumbs-up
1
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Stoichiometric Calculations
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon