See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Meq. of H2SO4 taken to absorb NH3 = 50 × 0.2 = 10 Meq. of H2SO4 left after NH3 absorption = Meq. of NaOH used for H2SO4 = 25 × 0.19 = 4.75 Meq. of H2SO4 used for NH3 = 10 – 4.75 = 5.25 %N