Assume that the reaction considered here homogeneous gaseous reaction : A ( g ) → B ( g ) List - I (Containing order of the reaction) List - II (Containing properties of the reaction) (P) Order less t

Question

Assume that the reaction considered here homogeneous gaseous reaction : $A (g) \to B (g)$

List - I (Containing order of the reaction)	List - II (Containing properties of the reaction)
(P) Order less than 1	(A) Reaction will not undergo 100% completion in finite time interval
(Q) Order equal to zero	(B) Rate of reaction will remain uniform as long as reactant is remaining
(R) Order greater than or equal to 1	(C) Rate of reaction may increase as the reaction proceeds
	(D) Reaction can never be elementary

TestHub · Accepted Answer

Question Explanation: Find match the column

Concept: This question is based on first order reaction.

Solution:

Zero order: rate = constant = $k$ , independent of concentration $\to$ completes in finite time.

Order $\geq 1$ (first, second, ...): concentration approaches zero asymptotically, so 100% completion is never achieved in finite time.

Order $< 1$ (fractional or negative): rate can increase as concentration decreases (especially for negative order reactions).

Matching:

P: Order less than 1

Rate may increase as the reaction proceeds $\to$ (C)

Q: Order equal to zero

Rate remains uniform as long as reactant is present $\to$ (B)

R: Order greater than or equal to 1

Reaction will not undergo 100% completion in finite time $\to$ (A)

Final Answer: Option (A)

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