Q40 / 160 · NTA Abhyas (NEET) 2020 · Chemistry · Solutions

The boiling point of a glucose solution containing 12 g of glucose in 100 g of water is 100. 34°C . Boiling point of water is 100° C. The molal elevation constant of water is

  • Correct answer
    A
    0.51 ° C/Molal
  • B
    51 ° C/Molal
  • C
    5.1 ° C/Molal
  • D
    None of these

Solution

ΔTb=100.34-100=0.34°C
∆Tb=kb×w2×1000M2×w1
kb=∆Tb×M2×w1w2×1000
kb=0.34×180×10012×1000=0.51

Hence, the correct answer is option: 'A'.

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