Answer
$Cl^-$ doesn't act as a weak base.
Work Step by Step
1. Protonate this anion, to get its conjugate acid:
$Cl^- --\gt HCl$
2. Analyze the protonated compound.
- Strong acids have insignificant bases as conjugate pair.
- HCl is a strong acid, therefore, $Cl^-$ has an insignificant basicity.
- So, $Cl^-$ doesn't act as a weak base.
