Which of the following are oxidation-reduction reactions?
a. AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
b. 6Li(s) + N2(g) → 2Li3N(s)
c. Ni(s) + Pb(NO3)2(aq) → Ni(NO3)2(aq) + Pb(s)
d. 2K(s) +2H2O(l) → 2KOH(aq) + H2(g)
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