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Dude group 7 elements are oxidizing agents cause they're very easily reduced to their halides...the halides in turn are good reducing agentsi told you that a good reducing agent is the one which oxidises most easily. examples:
Cl- Fl- I-
in the above ions the general equation is
2Cl- -->Cl2 + 2e-
Cl- ion is more stable than I- but Fl- is more stable than Cl-. so strongest reducing agent is I-
Cl F I
none of these are oxidising agents
Na Mg Al
equation when oxidised
Na --> Na+ + e-
This is the equation of ionisation. Na ionise more readily than Mg which is ionises more readily than Al
So Na is strongest