MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The ratio of theoretical molar mass to the experimentally observed molar mass is known as the van 't Hoff factor i. i = Theoretical molar mass Observed molar mass We need to find the solute for which i = 3. Assuming complete dissociation for the given strong electrolytes: For KCl K ^+ + Cl ^-, i = 2 For K _2 SO _4 2 K ^+ + SO _4^ 2- , i = 3 For MgSO _4 Mg ^ 2+ + SO _4^ 2- , i = 2 For Al _2( SO _4)_3 2 Al ^ 3+ + 3 SO _4^ 2- , i = 5 Thus, K _2 SO _4 has a van 't Hoff factor of 3. Answer: K _2 SO _4