Question

Which of these elements has the lowest standard reduction potential?

A. chlorine

B. iron

C. lithium

D. zinc

Answer 1

Standard reduction potential is the likelihood that a species will be reduced. It is written in the form of a reduction half reaction.
Lithium  has the lowest standard reduction potential.

Answer 2

Answer: C. lithium

Explanation:

Standard reduction potential is the tendency for an element to gain electrons or get reduced ,measured at standard conditions i.e. when concentration is 1 M and temperature is 298 K.

It is given by: $E^0_{M^+/M}$

$E^0_{[Cl^{2}/2Cl^-]}=+1.36V$

$E^0_{[Fe^{2+}/Fe]}=-0.41V$

$E^0_{[Li^{+}/Li]}=-3.04V$

$E^0_{[Zn^{2+}/Zn]}=-0.76V$

Thus lithium has the lowest tendency to accept electrons and thus has lowest standard reduction potential.