Question

which of the following electrodes will act as anodes when connected to standard hydrogen electrode
1. Al/Al3+. E= -1.66
2.Fe/Fe2+. E= -0.44
3.Cu/Cu2+. E= +0.34
4.F2(g)/2F-(aq). E=+o.87​

Answer 1

Answer:

HII! MATE!

Explanation:

Al → Al+3  +  3e-

MULTIPLYING BY 2

Fe+2  +  2e-  →Fe

MULTIPLYING BY 3

⇒ADDING ABOVE EQUATIONS GIVES

2Al + 3Fe+2 →2Al+3 + 3Fe

ECELL= E°CELL - 0.059/6 LOG (CONC.Al+3/CONC. OF Fe+2)

WHICH GIVES

= 1.66-0.44+0.00296= 1.22V

HOPE U UNDERSTAND AND ANSWER IS RIGHT