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NEET levelSingle correct optionDifficulty 1 of 3ck009

A zero order reaction has $k = 0.02 mol L^{- 1} mi n^{- 1}$ and $[A]_{0} = 0.8 mol L^{- 1}$ . The time taken for $A$ to be completely consumed is

A $20 min$
B $80 min$
C $40 min$
D $0.016 min$

Answer: C

For zero order,

[A] = [A]_{0} - k t

, which reaches zero at

t = [A]_{0} / k = 0.8/0.02 = 40 min

.

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