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3.c
4.a
6.b
7.a
9.c
10.d
11.
a2
b1
c4
d5
12.
MgS
Fe2(CO3)3
CU2SO4
13.
Zn + H3PO4 -> Zn3(PO4)2 + H3
CaO + H3PO4 -> Ca3(PO4)2 + H2O + H