The following data were obtained during the first order thermal decomposition of $\text{C}_2\text{H}_5\text{Cl}$ at a constant volume : $\text{C}_2\text{H}_5\text{Cl (g)} \longrightarrow \text{C}_2\text{H}_4 \text{(g)} + \text{HCl (g)}$ | Experiment | Time $(\text{s}^{-1})$ | Total pressure (atm) | | :--- | :--- | :--- | | 1 | 0 | $0\cdot4$ | | 2 | 100 | $0\cdot6$ | Calculate the rate constant. (Given : $\log 2 = 0\cdot3010, \log 3 = 0\cdot4771, \log 4 = 0\cdot6021$)

Year	Paper Code	Set	Position
CBSE 2023	Series Other	Set 1	Question 30
CBSE 2023	Series Other	Set 1	Question 26
CBSE 2023	Series Other	Set 1	Question 27

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)