Verified Solution • 2025–26 Session moderate

QJEEM21Ch286b: JEE Main 2021 Chemistry - Class 12 JEEM21Ch286b Solution: The reaction that occurs in a breath analyser, a device used to …

The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is

2K2Cr2O7+8H2SO4+3C2H6O→2Cr2(SO4)3+3C2H4O2+2K2SO4+11H2O2{K_2}C{r_2}{O_7} + 8{H_2}S{O_4} + 3{C_2}{H_6}O \to 2C{r_2}{(S{O_4})_3} + 3{C_2}{H_4}{O_2} + 2{K_2}S{O_4} + 11{H_2}O

If the rate of appearance of Cr2(SO4)3 is 2.67 mol min −- 1 at a particular time, the rate of disappearance of C2H6O at the same time is _____________ mol min −- 1. (Nearest integer)

Step-by-Step Verified Solution

(Rate of disappearance of C2H6O3)\left( {{{Rate\,of\,disappearance\,of\,{C_2}{H_6}O} \over 3}} \right)

=(Rate of disappearance of Cr2(SO4)32)= \left( {{{Rate\,of\,disappearance\,of\,C{r_2}{{(S{O_4})}_3}} \over 2}} \right)

⇒(2.67 mol/min⁡ ×32)=\Rightarrow \left( {{{2.67\,mol/\min \, \times 3} \over 2}} \right) = rate of disappearance of C2H6O.

⇒\Rightarrow Rate of disappearance of C2H6O = 4.005 mol/min.

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring