Name the reducing agent used in middle of series
Answers
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In this series, all reduction potentials are given on hydrogen scale whose, Eo is taken as zero.
The standard reduction potential of an element is a measure of the tendency of that element to get reduced.
The element which has greater reduction potential gets reduced easily. While the elements with low reduction potential will get easily oxidized
Elements that lose electrons more easily have lower (negative) reduction potential and those which lose electrons with greater difficulty or instead of losing they accept electrons more easily have a higher (positive) reduction potential.
In EMF series elements having higher (+ ve), the reduction potential is placed at the top. While those having lower (-ve) reduction potential are placed at the bottom. SHE has the middle position in the electrochemical series.
The substances which are stronger reducing agents than hydrogen are placed below the hydrogen in the series and have negative standard reduction potential. The substances which are weaker reducing agents than hydrogen are placed above the hydrogen in the series and have positive standard reduction potential. Thus as we move down the group strength of reducing agent increases while the strength of the oxidizing agent decreases.