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Question:

Decomposition of X exhibits a rate constant of 0.05µg/year. How many years are required for the decomposition of 5µg of X into 2.5µg?

50

20

40

25

Solution:

Rate constant (K) = 0.05µg/year means zero-order reaction
t1/2 = a0/2K = 5µg / (2 × 0.05µg/year) = 50 year. Hence, the correct option is A