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JEE Main levelSingle correct optionDifficulty 2 of 3ck035

A zero order reaction has a half-life of $20 min$ when $[A]_{0} = 0.50 M$ . The half-life when $[A]_{0} = 2.0 M$ is

A $20 min$
B $40 min$
C $160 min$
D $80 min$

Answer: D

For zero order

t_{1/2} = [A]_{0} /2 k

, so

t_{1/2}

is proportional to

[A]_{0}

. The concentration is raised by a factor

2.0/0.50 = 4

, so

t_{1/2} = 4 \times 20 = 80 min

.

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