allerySalt is sprinkled on icy roads in cold countries to:
ARaise the freezing point of ice slightly
BMake the ice melt at a higher temperature
CLower the freezing point of water (depression)
DIncrease the density of ice on the road surface
Answer & Solution
Correct answer: C. Lower the freezing point of water (depression)
Salt dissociates into Na+ + Cl- (i = 2) and lowers the freezing point of water via colligative effect ΔTf = Kf × m × i.
**Result:** ice melts at temperatures below 0°C, clearing the road.
Same principle in antifreeze.
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