(A) 1−αA ⟶ Products
k=4.6 × 10−3 s−1
kt=ln 1−α1
α=1−e−kt
Reaction completes at infinite time.
(B) For first order reaction,
Half-life =4.6 × 10−30.693=150.65 s
(C) For 10 % completion, t=t1
a=100, a−x=100−10=90 k=t12.303 log 90100=4.6 × 10−3 t1=4.6 × 10−32.303 × 0.04575
For 90 % completion t=t2, a=100, a−x=100−90=10
k=t22.303 log 10100=4.6 × 10−3 t22.303 × 1=4.6 × 10−3 ⇒ t2=4.6 × 10−32.303 t1t2=0.045751=21.85 (Incorrect)
(E) Unit of rate = mol L–1s–1
Unit of rate constant = s–1
Both have different units.
∴ Number of correct statements =1