Which of the following pair of solutions can we expect to be isotonic at the same temperature?

Step-by-step solution

=i C R T When, i, C, T are same for 2 or more solution then their osmotic pressure are also same that are known as isotonic. aligned & (1) NaCl Na ⁺+ Cl ⁻ i=2 & Na ₂ SO ₄ 2 Na ⁺+ SO ₄⁻² & i=3 aligned (i) is different, so not an isotonic (2) gathered Ca ( NO ₃ )₂ Ca ⁺²+2 NO ₃⁻[i=3] Na ₂ SO ₄ 2 Na ⁺+ SO ₄⁻²[i=3] gathered (i) is same, so this pair is an isotonic. (3) Urea i=1 non electrolyte NaCl , i=2 [ Na ⁺+ Cl ⁻ ] (i) is different, so not an isotonic (4) Urea i=1 MgCl ₂ i=3 [ Mg ²⁺+2 Cl ⁻ ] (i) is different, so not