E0cell = E0cathode - E0anode
given cell required volts E0cell = +0.90 V, and E0anode = -0.99 V
E0cathode = E0cell + E0anode = +0.90 V + (-0.99 V) = -0.09 V
E0cathode = -0.09 V
So at least a minimum of -0.09 V must be supplied by cathode to achieve 0.90 V, and there is no maximum limit since they asked us at least 0.80 V should be supplied.
we can use any reaction that has minimum -0.09 V
Hope this helped you!
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