Question

Which electrochemical reaction is spontaneous in a galvanic cell?

		Ni2+(aq) + Cu(s) --> Ni(s) + Cu2+(aq)
		Cr3+(aq) + Au(s) --> Cr(s) + Au3+(aq)
		Cu2+(aq) + Co2+(aq) --> Cu+(aq) + Co3+(aq)
		Cu2+(aq) + Sn(s) --> Cu(s) + Sn2+(aq)

Which electrochemical reaction is non-spontaneous in an electrolytic cell?

F_2(g) + 2Cl^-_(aq) --> 2F^-_(aq) + Cl_2(g)

Ag⁺_(aq) + Fe²⁺_(aq) --> Ag_(s) + Fe³⁺_(aq)

Co²⁺_(aq) + Pb_(s) --> Co_(s) + Pb²⁺_(aq)

Mn²⁺_(aq) + Ba_(s) --> Mn_(s) + Ba²⁺_(aq)

Which electrochemical reaction is the most spontaneous, generating the highest cell voltage?

		F2(g) + 2Cl-(aq) --> 2F-(aq) + Cl2(g)
		Ag+(aq) + Fe2+(aq) --> Ag(s) + Fe3+(aq)
		Mn2+(aq) + Ba(s) --> Mn(s) + Ba2+(aq)
		Cu2+(aq) + Sn(s) --> Cu(s) + Sn2+(aq)

Given the following notation for a galvanic cell diagram

Cd_(s) │ Cd²⁺_(aq) ║ Pb²⁺_(aq) │ Pb_(s)

Which one correctly represents the electrochemical reaction taking place in the galvanic cell?

Cd_{(s) +} Pb²⁺_{(aq) -->} Cd²⁺_{(aq) +} Pb_(s)

Cd²⁺_(aq)+ Pb²⁺_{(aq) --> Cd(s)+} Pb_(s)

Cd²⁺_{(aq) +} Pb_{(s) -->} Cd_{(s) +} Pb²⁺_(aq)

Cd²⁺_{(aq) +} Pb²⁺_{(aq) -->} Cd_{(s) +} Pb²⁺_(s)

Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge.

. an Al(s) electrode in 0.5 M Al₂(SO₄)₃ solution

. a Pb(s) electrode in 1.0 M Pb(NO₃)₂ solution

Which electrode is the cathode?

		Al
		Pb
		Al3+
		Pb2+