Assertion: In the dissociation of PCl5 at constant pressure and temperature, the addition of helium at equilibrium increases the dissociation of PCl5.
Reason: Helium reacts with Cl2 .
1. Both the assertion and the reason are true and the reason is the correct explanation of assertion.
2. Both the assertion and the reason are true and the reason is not the correct explanation of assertion.
3. Assertion is true but the reason is false.
4. Assertion is false but the reason is true.
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