The following graph is obtained for a first order reaction (A $\rightarrow$ P). The activation energy ( $\mathrm{E}_{\mathrm{a}}$ in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) and heat of reaction ( $|\Delta \mathrm{H}|$ in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for this reaction are respectively $\left(\mathrm{x}=\right.$ reaction coordinate $; \mathrm{y}=\mathrm{E}$ in $\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)$

• A

  5,15
• Correct answer
  B

  15,5
• C

  25,5
• D

  10,25

Hence, the correct answer is option: 'B'.