JEE PYQ: Thermodynamics Question 17
Question 17 - 2020 (09 Jan Shift 1)
If enthalpy of atomisation for $\text{Br}_2(\ell)$ is $x$ kJ/mol and bond enthalpy for $\text{Br}_2$ is $y$ kJ/mol, the relation between them:
(1) is $x = y$
(2) does not exist
(3) is $x > y$
(4) is $x < y$
Show Answer
Answer: (3)
Solution
$\Delta H_{\text{atomisation}} = \Delta H_{\text{vap}} + \text{Bond energy}$. Hence $x > y$.