(Milky Cloud) $C \xleftarrow{CO_2} A + Na_2CO_3 \rightarrow B + C$
The chemical formulae of $A$ and $B$ are

  • A
    $NaOH$ and $Ca(OH)_2$
  • B
    $Ca(OH)_2$ and $NaOH$
  • C
    $NaOH$ and $CaO$
  • D
    $CaO$ and $Ca(OH)_2$

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