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Which of the following is a neutralization reaction?

a
Ca(OH)2 + 2 HCl → CaCl2 + 2 H2O

b
CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl

c
4 FeS + 7 O2 → 2 Fe2O3 + 4 SO2

d
SnO2 + 2 H2 → Sn + 2 H2O