COMEDK · Chemistry · 19. Chemical Kinetics

In a chemical reaction i.e., \(A+2 B \longrightarrow\) products, when concentration of \(A\) is doubled, rate of the reaction increases 4 times and when concentration of \(B\) alone is doubled rate continues to be the same. The order of the reaction is

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Answer & Solution

Correct Answer

(B) 2

Step-by-step Solution

Detailed explanation

Let the order of reaction w.r.t. \(A\) is \(x\) and w.r.t. \(B\) is \(y\). \(r_{1}=k[A]^{x}[B]^{y} \quad \text{...(i)}\) \(r_{2}=k[2 A]^{x}[B]^{y} \quad \text{...(ii)}\) \(r_{3}=k[A]^{x}[2 B]^{y} \quad \text{...(iii)}\)…

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

Characteristics	Vitamins
A	Water soluble that is not excreted easily	W	B\(_2\)
B	Prevents Cheilosis	X	B\(_6\)
C	Fat soluble	Y	B\(_{12}\)
D	Prevents seizures and convulsions	Z	E

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