During the winter season in a particular year, Kashmir experienced heavy snowfall. It was an unexpected snowfall. Thousands of visitors were stranded because it was dangerous to travel on snowy roads and vehicles could not move as water froze in the car radiators. In such conditions officials decided to sprinkle rock salt or CaCl₂ on roads.
(i) Why was it decided to sprinkle rock salt or CaCl₂ on the roads?
(ii) A mixture of ethylene glycol and water is used as coolant in car radiators. Why?
(iii) How many grams of ethylene glycol (mol. wt. = 62 g mol^-1 ) should be added to 10 kg of water so that the solution freezes at -10^oC? (K_f for water = 1ˑ86 K kg mol^-1 )

Solution

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