Answer
Strongest reducing agent: Zn
Weakest reducing agent: $F^{-}$
Work Step by Step
Reducing strength of each is given below:
$F^{-}: +2,.87$
Zn: -0.763
$N_{2}H_{5}^{+}: -0.23$
$I_{2}: +0.536$
$NO: +0.598$
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