For an endothermic reaction: (A) $\mathrm{qp}_{\mathrm{p}}$ is negative. (B) $\Delta_r H$ is positive. (C) $\Delta_r \mathrm{H}$ is negative. (D) $\mathrm{q}_{\mathrm{p}}$ is positive. Choose the correct answer from the options given below:

• Correct answer
  A

  B and D
• B

  C and D
• C

  A and B
• D

  A and C

Solution

For endothermic reactions, $\Delta \mathrm{H}_{\mathrm{r}}=$ positive (Heat is absorbed) $\Delta H=E_{a(f)}-E_{a(b)}$

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