Question

A sample of water is found to contain 5.85% $(\frac{w}{w})$ of AB (molecular mass 58.5) and 9.50% $(\frac{w}{w})$ XY2 (molecular mass 95). Assuming 80% ionisation of AB and 60% ionisation of XY2 , the freezing point of water sample is
[Given : Kf for water 1.86 K kg mol-1 , Freezing point of pure water is 273 K and A, B and Y are monovalent ions]

• A. 264.25 K
• B. 265.56 K
• C. 280.44 K
• D. 281.75 K

Answer 1

Answer: (A)

264.25 K

Answer 2

The correct answer is (A) : 264.25 K.