Chemistry - Complete s-block Question with Solution | TestHub

A. NaOH reacts with NH₄Cl to form NH₃, H₂O, and NaCl. NH₃ is a gas and evolves.

$$\mathrm{N}{\mathrm{H}}_4\mathrm{Cl}(\mathrm{aq})+\mathrm{NaOH}(\mathrm{aq})\to \mathrm{N}{\mathrm{H}}_3(\mathrm{g})+{\mathrm{H}}_2\mathrm{O}(\mathrm{l})+\mathrm{NaCl}(\mathrm{aq})$$

B. K₂CO₃ cannot be prepared by the Solvay process because KHCO₃ is highly soluble in water and does not precipitate.

C. Alkali metals dissolve in liquid NH₃ to form ammoniated electrons and metal ions, leading to a deep blue, conducting solution.

D. NaHCO₃ and H₂SO₄ react to produce CO₂ gas, which is used to extinguish fires by displacing oxygen.

$$2NaHC{\mathrm{O}}_3(\mathrm{aq})+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4(\mathrm{aq})\to \mathrm{N}{\mathrm{a}}_2\mathrm{S}{\mathrm{O}}_4(\mathrm{aq})+2{\mathrm{H}}_2\mathrm{O}(\mathrm{l})+2C{\mathrm{O}}_2(\mathrm{g})$$