Q33 / 155 · WBJEE 2019 · Chemistry

At constant pressure, the heat of formation of a compound is not dependent on temperature, when

  • Correct answer
    A
    $\Delta C_{p}=0$
  • B
    $\Delta C_{v}=0$
  • C
    $\Delta C_{p}>0$
  • D
    $\Delta C_{p} < 0$

Solution

Key Point According to Kirchhoff sequation $$ \Delta H_{(f)}=\Delta H_{(i)}+C_{P}(\Delta T) $$ At constant pressure $$ \Delta C_{p}=O $$ Therefore, heat of formation $\left(\Delta H_{f}\right)$ does not depend on temperature and value of $\Delta C_{p}$ i.e. when $\Delta C_{p}=0$ Hence, option (a) is the correct answer.

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

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