KVPY SX SB Exam 2012 Question Paper

Question : 48 of 120

Marks: +1, -0

A zero-order reaction, A → Product, with an initial concentration

[A]_0

has a half-life of 0.2 s. If one starts with the concentration

2[A ]_0

, then the half-life is

Solution:

t_{1\/2}∝1/{a^{n-1}}

for zero order reaction n = 0

\so t_{1\/2}∝a

(t_{1\/2})_1/(t_{1\/2})_2=a_1/a_2

0.2/(t_{1\/2})_2=[\A_0]/{2[\A]_0}

t_{1\/2}=0.4\sec

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