Question

Dissociation of phosphorus pentachloride $\left(P C I_{5}\right)$ is favored by-

(i)High T, High P

(ii) High T, low P

(iii) Low T, Low P

(iv) Low $T$, High P

Answer 1

Phosphorus pentachloride dissociated as, $\mathrm{PCl}_{5}(\mathrm{~g})-\mathrm{m} \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})$

Now, for this reaction difference between

the gaseous products in both side, $\Delta n=(2-1)=1$

So, we can say that the dissociation could be

favoured by low pressure.

And in high temperature the dissociation

would be more favorable as the value of

$\Delta \mathrm{n}=1$ for the given process.

Hence, the correct answer is "High T, low P"

The correct answer is (ii) High T , Low P