Which of the following are oxidation-reduction reactions?
a. Ca(s) + F2(g) → CaF2(s)
b. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
c. 2NaCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2NaNO3(aq)
d. 2CuCl(aq) → Cu(s) + CuCl2(aq)
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