KCET2017ChemistrySome Basic Concepts of Chemistry
Which of the following aqueous solution has highest freezing point?
Options
- A( 0.1 ) molal ( Al ₂ ( SO ₄ )₃ )
- B( 0.1 ) molal ( BaCl ₂ )
- C( 0.1 ) molal ( AlCl ₃ )
- D( 0.1 ) molal ( NH ₄ C l )
Correct answer
D. ( 0.1 ) molal ( NH ₄ C l )
Step-by-step solution
Freezing point depression is directly proportional to the no. of dissolved particles, ( T_ f =i k_ f m ). But freezing point is inversely proportional to no. of dissolved particles array |l|c| Compounds & Number of lons or van't Hoff Factor (i) Al ₂ ( SO ₄ )₃ 2 Al ³⁺+3 SO ₄ ²⁻ & 5 BaCl ₂ Ba ²⁺+2 Cl ⁻ & 3 AlCl ₃ Al ³⁺+3 Cl ⁻ & 4 NH ₄ Cl NH ₄+ Cl ⁻ & 2 array Therefore, it can be concluded that ( NH ₄ Cl ) has a highest freezing point as ( i =2 ).