Question

Which of the following has been arranged in the increasing
order of freezing point?
(a) 0.025M KNO₃ < 0.1M NH₂CSNH₂
< 0.05M BaCl₂ < 0.1M NaCl
(b) 0.1M NaCl < 0.05M BaCl₂
< 0.1M NH₂CSNH₂ < 0.025M KNO₃
(c) 0.1M NH₂CSNH₂ < 0.1M NaCl
< 0.05M BaCl₂ < 0.025M KNO₃
(d) 0.025M KNO₃ < 0.05M BaCl₂
< 0.1M NaCl < 0.1M NH₂CSNH₂

Answer 1

The correct order is 0.1M NaCl < 0.05M BaCl₂  < 0.1M NH₂CSNH₂ < 0.025M KNO₃ .

option (B) is correct.

Explanation:

• The below salts have different freezing points.
• The freezing point of KNO3 is more than the freezing point of NH₂CSNH₂ .
• Similarly the freezing point of BaCl₂ salt is more than the freezing point of NaCl.
• 0.1M NaCl < 0.05M BaCl₂ < 0. 1M NH₂CSNH₂ < 0.025M KNO₃
• Thus among the following salts KNO3 has the highest and NaCl has the lowest freezing point.

Thus the correct order is 0.1M NaCl < 0.05M BaCl₂  < 0.1M NH₂CSNH₂ < 0.025M KNO₃ .

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