Reaction is a first order reaction. It was started with pure A.

| t/min | Pressure of system at time t/mm Hg |
|---|---|
| 10 | 160 |
| | 240 |

Which of the following option is incorrect?

Question

Reaction  is a first order reaction. It was started with pure A.

| t/min | Pressure of system at time t/mm Hg |
|---|---|
| 10 | 160 |
|  | 240 |

Which of the following option is incorrect?

Canvas Classes · Accepted Answer

Step 1: Set up pressure relationships

At : , 0, 0 → Total =

At : 0, ,  → Total =

Given:  mm Hg →  mm Hg ✓ (option a is correct)

Step 2: Find  at t = 10 min

At time : , ,

Total

At :

mm Hg ✓ (option d is correct)

Step 3: Calculate rate constant

For first order:

Option (c) states  — this is INCORRECT ✗

Step 4: Check option (b)

First order reactions theoretically never reach 100% completion (exponential decay). ✓ Correct.

Answer: (c) — the rate constant  is wrong; correct va

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