COMEDK2024ChemistrySolutions
From the given aqueous solutions below, arrange them in the order of their increasing boiling points. (i) 10⁻⁴ M NaCl (ii) 10⁻³ M urea (iii) 10⁻³ M MgCl ₂ (iv) 10⁻³ M NaCl
Options
- A(ii) (i) = (iii) (iv)
- B(i) (ii) (iii) (iv)
- C(i) (ii) (iv) (iii)
- D(iv) (iii) (ii) = (i)
Correct answer
C. (i) (ii) (iv) (iii)
Step-by-step solution
(i) 10⁻⁴ M NaCl aligned NaCl & Na ⁺+ Cl ⁻ & =i C R T[i=2] & =2 10⁻⁴ R T aligned (ii) 10⁻³ M urea =1 10⁻³ R T[i=1] (iii) 10⁻³ M MgCl ₂ aligned & MgCl ₂ Mg ⁺²+2 Cl ⁻ & =3 10⁻² R T[i=3] aligned (iv) 10⁻³ M NaCl =2 10⁻³ R T [i=2] Then the correct increasing order is (i) (ii) < (iv) < (iii).