Question

For the reaction, $N_{2}O_{4}\left(\right.g\left.\right)\rightleftharpoons2NO_{2}\left(\right.g\left.\right)$ ; if percentage dissociation of $N_{2}O_{4}$ are 25%, 50%, 75% and 100, then the sequence of observed vapour densities will be

• A. $d_{25}>d_{50}>d_{75}>d_{100}$
• B. $d_{100}>d_{75}>d_{50}>d_{25}$
• C. $d_{25}=d_{50}=d_{75}=d_{100}$
• D. $\left(\right.d_{25}=d_{50}\left.\right)>\left(\right.d_{75}=d_{100}\left.\right)$

Answer 1

Answer: (A)

Here the reaction, $N_{2}O_{4}\left(\right.g\left.\right)\rightleftharpoons2NO_{2}\left(\right.g\left.\right)$ ;
As $\alpha =\frac{D - d}{\left(\right. n - 1 \left.\right) d}$ (Here d = vapour density or density after dissociation)
As percentage dissociation of $d_{25}>d_{50}>d_{75}>d_{100}$