`A overset(Delta)rarrB("oxide")+CO_(2)" " B+H_(2)O rarr C` `C+CO_(2) rarr A("milky")" "

`A overset(Delta)rarrB("oxide")+CO_(2)" " B+H_(2)O rarr C`
`C+CO_(2) rarr A("milky")" " C+NH_(4)Cl overset(Delta)rarrD("gas")`
`D+H_(2)O+CO_(2) rarrE " "E+NaCl rarrF`
`F overset(Delta) Na_(2)CO_(3)+H_(2)O+CO_(2)`
B and C are respectively
A. `CaO,Ca(OH)_(2)`
B. `Ca(OH)_(2),CaCO_(3)`
C. `CaCO_(3),Ca(OH)_(2)`
D. `Ca(OH)_(2),CaO`

`A overset(Delta)rarrB("oxide")+CO_(2)" " B+H_(2)O rarr C` `C+CO_(2) rarr A("milky")" " C+NH_(4)Cl overset(Delta)rarrD("gas")` `D+H_(2)O+CO_(2) rarrE

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