A graph between t1/2 and conc for nth order reaction is a straight line Reaction of this nature - Chemistry - Chemical Kinetics

Question

A graph between t 1 /2 and conc for
n th order reaction is a straight line Reaction
of this nature is completed 50% in 10 minutes when conc is 2 mol
L–1 This is decomposed 50% in t minutes
at 4 mol L–1, n and t are
respectively

(1) 0, 20 min (2) 1, 10 min (3) 1, 20 min (4) 0, 5 min

Kanika Khandelwal · Accepted Answer

Dear student,
From the graph, it is clear that t1/2 is
independent of concentration Hence reaction is of first order (For
first order reaction t1/2=0 693/k)
Due to the fact that t1/2 is independent of
initial concentration, it will remain same whether concentration is
2 or 4 molL-1â€‹Thus time required for
completion of reaction = 2*t1/2 = 2*10 = 20
min
Hence, n=1 and t=20 min
Option 3 is correct
Regards

A graph between t 1 /2 and conc. for n th order reaction is a straight line. Reaction of this nature is completed 50% in 10 minutes when conc. is 2 mol L–1. This is decomposed 50% in t minutes at 4 mol L–1, n and t are respectively (1) 0, 20 min. (2) 1, 10 min. (3) 1, 20 min. (4) 0, 5 min.