Which of the following chemical equations is an acid-base reaction?
a. Ba(OH)2(aq) + K2SO4(aq) → BaSO4(s) + 2 KOH(aq)
b. 3 NaOH(aq) + AlCl3(aq) → Al(OH)3(s) + 3 NaCl(aq)
c. 2 H+(aq) + Zn(s) → H2(g) + Zn2+(aq)
d. 2 HCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 HNO3(aq)
e. H3PO4(aq) + NH3(aq) → NH4+(aq) + H2PO4-(aq)
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