MHT CET202123 Sep 2021Morning ShiftChemistryChemical KineticsActual
A reaction is first order with respective to A and second order with respective to B . What is the effect on reaction rate if concentration of B is increased 3 times?
Options
- ARate increases 6 times
- BRate increase 9 times
- CRate increase 2 times
- DRate increase 3 times
Correct answer
B. Rate increase 9 times
Step-by-step solution
Rate law of reaction, r = k [ A ]^ [ B ]^2 If concentration of B is increased 3 times, aligned & B 3 ~B & r _ New = k [ A ][3 ~B ]^2 & r _ New r = k [ A ][3 ~B ]^2 k [ A ][ B ]^2 & r _ New r =3^2 & r _ New =9 r aligned Rate increase 9 times.