COMEDK2014ChemistrySolutions
A one molal solution of sodium chloride in water has the same boiling point as
Options
- A1 ~m solution of magnesium sulphate
- B1 ~m solution of magnesium chloride
- C1 ~m solution of aluminium sulphate
- D1 ~m solution of aluminium chloride
Correct answer
A. 1 ~m solution of magnesium sulphate
Step-by-step solution
T_ b =i K_ b m Two solutions having same molality and same van' t Hoff factors will have same elevation in boiling points ( T_ b ) and thus, have same boiling points (T_ b ) . For NaCl, i=2 ; MgSO ₄, i=2 ; MgCl ₂, i=3 ; Al ₂ ( SO ₄ )₃, i=5 and AlCl ₃, i=4 . Thus, one molal solution of sodium chloride in water has the same boiling point as one molal solution of MgSO ₄ .