JEE Chemistry 2023 Question with Solution

Given: A graph-based question about reaction order in regions $I$, $II$ and $III$.

Find: The number of correct statements among the listed options.

The solution states:

• Region-$I$ shows linear behavior, so it is first order.
• Region-$II$ shows non-linear behavior, so it is not first order.
• Region-$III$ shows constant rate, so it is zero order.

Thus:

• (A) is incorrect.
• (B) is incorrect.
• (C) is correct.
• (D) is incorrect.

The solution also introduces an extra statement (E) saying the order in region-$II$ lies between $0.1$ and $0.9$, and concludes that the correct statements are (C) and (E), giving the number of correct statements as $2$.

However, option (E) is not present in the listed options list. Therefore, the provided solution and the visible options are inconsistent.

From the visible options alone, only (C) is correct. But since the source solution concludes the final answer is $2$, the answer cannot be mapped unambiguously to the listed options.

Therefore, the extracted answer is marked AMBIGUOUS due to mismatch between the solution and the listed options.

Given: Region-wise behavior is described in the solution.

Find: Which listed statements are correct.

1. In region-$I$, the rate varies linearly, so this is first-order behavior.
2. In region-$III$, the rate becomes constant, so this is zero-order behavior.
3. In region-$II$, the behavior is non-linear, so it is not first order.

Checking the listed statements:

• (A) Overall order is one — false.
• (B) Order cannot be determined — false, because region-wise order is inferred.
• (C) Region-$I$ first order and region-$III$ zero order — true.
• (D) Region-$II$ first order — false.

So among the listed options, the count is $1$. But the solution says the count is $2$ by using an additional statement (E) not present in the options. This mismatch prevents a clean MCQ answer label.