Question

Write net equation for the spontaneous redox reaction and determine the standard cell potential that results when each of the following redox couples are connected in an electrochemical cell. Instructions:

Enter all substances in the order listed at the top of the column.

Use a carot to indicate a superscript, but do nothing for subscripts.

Use a hyphen + greater than (->) for yields.

Click on the eye symbol to check your formatting.

Couples	Rxn: Ox(1) + Red(2) + other -> Red(1) + Ox(2) + other	Eo (V)
Cu/Cu2+ and Ag1+/Ag	2Ag^1+ + Cu -> 2Ag + Cu^2+ CORRECT	0.46
Pb2+/Pb and Fe3+/ Fe2+	2Fe^3+ + Pb -> 2Fe^2+ + Pb WRONG-HELP	0.9
H1+/H2 and Ni2+/Ni	2H+ + Ni -> H^2 + Ni^2+ WRONG HELP	0.23
Cr/Cr3+ and Ti2+/Ti	2Cr^3+ + 3Ti -> 2Cr + 3Ti^2+ CORRECT	0.89

The two middle reactions are wrong. Not sure if the formulas are wrong or if I am just entering it incorrectly?