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A- etyn
C2H2 + H2 → C2H4
C- eten
2HCl + Ca(OH)2 → CaCl2 + 2H2O
B- chlorek wapnia
3CaCl2 + 2Na3PO4 → Ca3(PO4)2↓ + 6NaCl
D- fosforan(V)wapnia E- chlorek sodu