1. Tardigrade
  2. Question
  3. Chemistry
  4. A reaction takes place in a several sequential steps A, B, C and D. The value of enthalpy change for sequential steps are p, q, r and s, respectively. If B and C have equal values of enthalpy change with total enthalpy change t, then choose the incorrect symbolic equation among the following.

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Q. A reaction takes place in a several sequential steps $A$, $B, C$ and $D$. The value of enthalpy change for sequential steps are $p, q, r$ and $s$, respectively. If $B$ and $C$ have equal values of enthalpy change with total enthalpy change $t$, then choose the incorrect symbolic equation among the following.

Thermodynamics

Solution:

According to the question, the diagrammatic representation of given reaction can be
image
As given, $q=r$
[Hence, (a) is correct]
Using concept of Hess's law, $t=p +q+ r+ s$
$\therefore q+ r=t-(s +p)$ [Hence, (b) is correct]
$2 q=t-(s +p)$ [Hence, (c) is correct]
$[\because q=r]$
but $q+r=p+ s$ is incorrect because exact amount of enthalpy change for each step is not given.