Осуществить превращение:

                   1                                  2                                               3                                                            4

Углерод С→ метан СН4 → угарный газ СО → углекислый газ СО2 →

                                           5                                                              6           

карбонат кальция СаСО3 → углекислый газ СО2    → угарный газ СО.

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