TS EAMCET · Chemistry · Chemical Kinetics

Which of the following graphs represent a first order reaction \((a=\) initial concentration of reactant, \(x=\) concentration of reactant consumed, \(t=\) time)?

A (i), (ii), (iv)
B (iii), (iv)
C (ii), (iii)
D (i), (ii)

Verified Solution

Answer & Solution

Correct Answer

(D) (i), (ii)

Step-by-step Solution

Detailed explanation

For a first order reaction \(\text { Rate }=-\frac{\Delta[A]}{\Delta t}=k[A]\) It is a straight line plot with negative slope when concentration of reactant is considered as in (i) and half-life for first order is independent from concentration, as in plot (ii).

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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