A neutral white sodium salt (A) on heating liberates a gas (B), leaving a highly alkaline reside (C ). Thegas (B) is colourless, odourless and turns lime water milky. (A) is

Options

A. `NaNO_(3)`
B. `NaHCO_(3)`
C. `Na_(2)CO_(3)`
D. `NaCI`

Answer

B

Explanation

`underset("sodium salt")underset("Neutral white")((A)) overset(Delta)rarr underset(("Gas"))((B))+ underset("alkaline residue")underset(Highly")((C ))`
(B) is colourless, odourless gas and truns lime water milky.
(A) is `NaHCO_(3)`
`underset((A))(2NaHCO_(3))overset(Delta)rarr underset((C ))underset("residue")underset("Highly alkaline")(Na_(2)CO_(3))+underset((B))(CO_(2))+H_(2)O`
`underset((B))(CO_(2))+underset("water")underset("Lime")(Ca(OH)_(2))rarr underset("Milkiness")(CaCO_(3))+H_(2)O`