Question

Consider the following statements about the Hess's law of constant heat summation.
I. If a reaction takes place in several steps then its standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
II. The enthalpy of an overall reaction $A\to B$ along one route is ${\Delta }_{r}H$ and ${\Delta }_r{H}_1,{\Delta }_r{H}_2,{\Delta }_r{H}_3\dots$ representing enthalpies of reactions leading to the same product, $B$ along another route, then we have
${\Delta }_{r}H={\Delta }_r{H}_1+{\Delta }_r{H}_2+{\Delta }_r{H}_3\cdots$
Select the correct statement and choose the correct option.

• A. Only $I$
• B. Only $II$
• C. Both $I$ and $II$
• D. None of these

Answer 1

Answer: (C)

Correct answer is (c) Both $I$ and $II$