COMEDK · Chemistry · 19. Chemical Kinetics

When the concentration of the reactant in a given reaction is halved and if the rate of reaction is halved, the order of the reaction is:

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Answer & Solution

Correct Answer

(A) 1

Step-by-step Solution

Detailed explanation

Let the rate of the reaction be \(r = k[A]^n\), where \(n\) is the order of the reaction. When the concentration of the reactant is halved, the new concentration is \(\dfrac{[A]}{2}\). The new rate is given as \(\dfrac{r}{2}\). Substituting these into the rate law:…

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.

Same subject

Match the items in Column I with their description in Column II

S.No.	Column I	S.No.	Column II
A	Kappa K	P	Intensive property.
B	\(E_{cell}^0\)	Q	Extensive property.
C	Molar conductivity	R	Decreases with decrease in concentration of both strong and weak electrolytes.
D	\(\Delta G_{cell}\)	S	Increases with dilution.

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