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In a chemical reaction, the rate of reaction is independent of the reactant concentration, what is it called what?

In a chemical reaction, the rate of reaction is independent of the reactant concentration, what is it called what? Correct Answer Zero order reaction

In zero order reaction, the rate of reaction is independent of the reactant concentration where as in other reactions the rate of reaction depends on the reactant concentration.

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Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is
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