See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

  2 3 2 4 2 MgCl 2NH 2H O Mg OH s 2NH Cl       2 2 Mg OH s Mg 2OH       4 4 2 NH SO is acidic so it will dissolved  2 Mg OH solid which is formed in mix. When all  2 Mg OH will re-dissolve the conc. of Mg2+ ions in the final solution will become equal to its initial conc.   3