NEET Chemistry Chemical Kinetics Questions Solved

BOARD

The thermal decomposition of HCO2H is a first order reaction with a rate constant of 2.4 ×10-3 s-1 at a  certain temperature. Calculate how long will it take for three-fourths of initial quantity of HCO2H to decompose. (log 0.25 = -0.6021)

Given: K=2.4 ×10-3 

      According to the formulas, where a=1K=2.4×10-3x=34=0.75

           t = 2.303K log11-0.75

 or      t = 2.3032.4×10-3 log 0.25

or      t = 2.3032.4×10-3 × 0.6020

or      t = 1.3864062.4×10-3  = 577.6

 Time taken,  t = 577.6 sec.

Difficulty Level:

Crack NEET with Online Course - Free Trial (Offer Valid Till August 25, 2019)