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Q.
If initial concentration is doubled, the time for half reaction is also doubled, the order of reaction is
Chemical Kinetics
Solution:
$t_{1/2} \propto \frac{1}{(cone, of reactant)^{n-1}}$For zero order, n = 0
The half life period $\propto$ (cone, of reactant).In the question, the time for half reaction is doubled when initial concentration is doubled it is zero order reaction.