AP EAMCET · Chemistry · Chemical Kinetics

The rate constant for a zero order reaction $A \to$ products is $0.0030 mol L^{- 1} s^{- 1}$ . How long it will take for the initial concentration of $A$ to fall from $0.10 M$ to $0.075 M$ ?

A $10 s$
B $20 s$
C $8.33 s$
D $1.33 s$

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Answer & Solution

Correct Answer

(C) $8.33 s$

Step-by-step Solution

Detailed explanation

Zero order reaction means that the rate of the reaction is proportional to zero power of the concentration of reactants. Some enzyme catalysed reactions and reactions which occur on metal surfaces are a few examples of zero order reactions. The decomposition of gaseous ammonia…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The rate constant for a zero order reaction A→ products is 0.0030 mol L-1 s-1. How long it will take for the initial concentration of A to fall from 0.10M to 0.075M?

Step-by-step Solution

The rate constant for a zero order reaction $A \to$ products is $0.0030 mol L^{- 1} s^{- 1}$ . How long it will take for the initial concentration of $A$ to fall from $0.10 M$ to $0.075 M$ ?