In the manufacture of sodium carbonate, following reactions are involved:
`(A) overset(Delta)rarr (B) + CO_(2)`
`(B) +H_(2)O rarr (C ) overset(+NH_(4)CI rarr (D)overset(+H_(2)O)rarr underset("Solution")(E )`
`(E )+CO_(2)rarr (F)`
`(F)+NaCI rarr (G) overset("Heat")rarr Na_(2)CO_(3)+CO_(2)+H_(2)O`
(D) is a gas which is soluble in `H_(2)O`
(A) is

Options

A. `Ca(HCO_(3))_(2)`
B. `CaCO_(3)`
C. `CaC_(2)`
D. `NaHCO_(3)`

Answer

B

Explanation

`underset((A))(CaCO_(3))overset(Delta)rarr underset((B))(CaO)+CO_(2)`
`underset((B))(CaO)+H_(2)O rarr underset((C ))(Ca(OH)_(2))`
`underset((C ))(Ca(OH)_(2))+2NH_(4)CI rarr underset("Water soluble gas")underset((D))(2NH_(3)uarr)+CaCI_(2)+2H_(2)O`
`underset((D))(NH_(3))+H_(2)O rarr underset((E ))(NH_(4)OH_((s))`
`underset((E ))(NH_(4)OH)+CO_(2)rarr underset((F))(NH_(4)HCO_(3))`
`underset((F))(NH_(4)HCO_(3))+NaCI rarr underset(G)(NaHCO_(3))+NH_(4)CI`
`underset((G))(2NaHCO_(3)) overset(Delta)rarr Na_(2)CO_(3)+H_(2)O+CO_(2)`