цепочки превращений:
C ➡ CO2 ➡ CaCO3 ➡ CO2 ➡ CaCo3 ➡ Ca(NO3)2

Ca ➡ Ca(OH)2 ➡ CaSO4 ➡ BaSO4

Al ➡ Al2(SO4)3 ➡ Al(OH)3 ➡ Al2O3 ➡ NaAlO2 ➡ AlCl3 ➡ Al
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