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Half life of zero order reaction A → product is 1 hour, when initial concentration of reactant is 2.0 mol L – 1 . The time required to decrease concentration of A from 0.50 to 0.25 mol L – 1 is:

1. 4 hour
2. 0.5 hour
3. 60 min
4. 15 min

Correct answer: 15 min

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