Осуществите цепочку превращений:
S → SO2 → H2SO3 → CaSO3
S+O2=SO2
SO2+H2O=H2SO3
H2SO3+CaCl2=CaSO3+2HCl
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S+O2=SO2
SO2+H2O=H2SO3
H2SO3+CaCl2=CaSO3+2HCl