Concept:While many factors affect chemical reactions, temperature is the universal factor that alters the fundamental rate constant (\( k \)) of
all reactions via the Arrhenius equation.
Formula:$$ k = A e^{-E_a / RT} $$
Solution:- The question asks what the rate of any reaction depends upon.
- Zero-order reactions do not depend on concentration or pressure.
- However, all reactions, regardless of their order, have a rate constant that is exponentially dependent on the absolute Temperature (\( T \)).
- Therefore, temperature is the only universally applicable dependency among the choices.
Why other options are incorrect:Concentration and pressure do not affect zero-order reactions. Rate constant is a parameter defining the rate, not an external variable that the rate "depends upon" in this context.
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