Express answer as a chemical equation -identify all phases A) Ni(s)+Cd2+(aq)->Ni

Question

Express answer as a chemical equation -identify all phases

A) Ni(s)+Cd2+(aq)->Ni2+(aq)+Cd(s)
B) Mg(s)+Cr3+(aq)->Mg2(aq)+Cr(s)
C) Cl-(aq)+2NO3-(aq)->NO(aq)+Cl2(g)

Explanation / Answer

(A)Ni(s)+Cd2+(aq)->Ni2+(aq)+Cd(s) This itself is the balances redox reaction (B)Mg(s) + Cr3+(aq) --> Mg2+(aq) + Cr(s)? Half reactions Mg --> Mg2+ + 2e- Cr3+ + 3e- --> Cr Multiply coefficients so as to cancel out the electrons from both sides 3Mg + 2Cr3+ --> 3Mg2+ + 2Cr (C)Given, Cl^- + 2NO3^- --> NO + Cl2 Half Reactions 2Cl^- --> Cl2 + 2e^- 2NO3^- + 8H^+ +6e^- --> 2NO + 4H2O 3(2Cl^- --> Cl2 + 2e^-) = 6Cl^- --> 3Cl2 + 6e^- 2NO3^- + 8H^+ +6e^- --> 2NO + 4H2O Net equation by addition 6Cl^- + 2NO3^- + 8H^+ +6e^- --> 3Cl2 + 6e^- + 2NO + 4H2O Balancing charges 6Cl^-(aq) + 2NO3^-(aq) + 8H^+(aq) --> 2NO(g) + 3Cl2(g) + 4H2O(l)

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