Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The question asks which compound yields only an oxyacid upon hydrolysis under ordinary conditions.

A. NF₃: Nitrogen trifluoride is stable and does not readily hydrolyze under ordinary conditions. If it did, it would produce HF and an oxyacid of nitrogen, but not exclusively an oxyacid.

B. H₂S₂O₇: This is pyrosulfuric acid (oleum). Hydrolysis of H₂S₂O₇ with water produces only sulfuric acid (H₂SO₄), which is an oxyacid.

$${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7+{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{H}}_2{\mathrm{SO}}_4$$

C. SbCl₃: Antimony trichloride hydrolyzes to form antimonyl chloride (SbOCl) and HCl, not exclusively an oxyacid.

$${\mathrm{SbCl}}_3+{\mathrm{H}}_2\mathrm{O}\to \mathrm{SbOCl}+2\mathrm{HCl}$$

D. NCl₃: Nitrogen trichloride hydrolyzes to form ammonia (NH₃) and hypochlorous acid (HOCl). While HOCl is an oxyacid, NH₃ is not.

$${\mathrm{NCl}}_3+3{\mathrm{H}}_2\mathrm{O}\to {\mathrm{NH}}_3+3\mathrm{HOCl}$$

Therefore, H₂S₂O₇ is the only compound that gives only an oxyacid (H₂SO₄) as a final product by hydrolysis under ordinary conditions.

The final answer is $\boxed{B}$.