Question

$I$. The enthalpy of formation ($\Delta H_f$) of ${Br}_2\left(g\right)$ at $1.00atm$ and $298K$ is $0kJ/mol$.
$II$. The $\Delta H_f$ is $0$ for elements in their standard state.

• A. Statement $I$ is true, Statement $II$ is true
• B. Statement $I$ is true, Statement $II$ is false
• C. Statement $I$ is false, Statement $II$ is true
• D. Statement $I$ is false, Statement $II$ is false

Answer 1

The correct option is C Statement $I$ is false, Statement $II$ is true

• The standard state of Bromine element is $B{r}_2\left(l\right)$
  

$\Delta H_f\left(B{r}_2\right(l\left)\right)=0$

• The enthalpy of formation of elements in their standard state is zero.
  
• Statement II is false, Statement IIII is true