Solutions

Arrange the following solutions in order of their increasing boiling points. (i) 10-4 M NaCl (ii) 10-4 M Urea (iii) 10-3 M NaCl (iv) 10-2 M NaCl

1. (i) < (ii) < (iii) < (iv)
2. (ii) < (i) < (iii) < (iv)
3. (iv) < (iii) < (i) < (ii)
4. (ii) < (i) (iii) < (iv)

Answer

(2) (ii) < (i) < (iii) < (iv)

Solution

Tb i c; NaCl: i = 2, urea: i = 1

(i) 2 10-4, (ii) 1 10-4, (iii) 2 10-3, (iv) 2 10-2

(ii) < (i) < (iii) < (iv)

Answer: (2)