(A) Colourless salt `+ NaOH overset(Delta)rarr (B)` gas + (C) alkaline solution
(C) `+ Zn ("dust") overset("warm")rarr` gas (B) , (A)` overset(Delta)rarr ubrace("gas " (D) + "liquid"(E))_("both triatomic")`
Gas (B) given white fumes with HCl. Identify (A) to (E) and write the chemical reaction involved

Explanation

`NH_(4) NO_(3) + NaOH overset(Delta)rarr NH_(3) + NaNO_(3) + H_(2)O, NH_(3) + HCl rarr NH_(4) Cl` (white fumes)
`NaNO_(3) + 7NaOH + 4Zn rarr 4 Na_(2) ZnO_(2) + NH_(3) uarr + 2H_(2)O`
`NH_(4) NO_(3) overset(Delta)rarr N_(2)O + 2H_(2)O`
So, (A) `= NH_(4) NO_(3)`, (B) `= NH_(3), (C) = NaNO_(3), (D) = N_(2)O and (E) = H_(2)O`