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During the winter season in a particular year, Kashmir experienced heavy snowfall. It was an…
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 $\text{CaCl}_2$ on roads.
Read the passage given below carefully and answer the questions that follow.
(i)[1.0]
Why was it decided to sprinkle rock salt or $\text{CaCl}_2$ on the roads?
(ii)[1.0]
A mixture of ethylene glycol and water is used as coolant in car radiators. Why?
(iii)[1.0]
How many grams of ethylene glycol ($\text{mol. wt.} = 62\text{ g mol}^{-1}$) should be added to $10\text{ kg}$ of water so that the solution freezes at $-10^\circ\text{C}$? ($K_f$ for water $= 1\cdot86\text{ K kg mol}^{-1}$)
Answer
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From ISC 2024 Specimen Chemistry Paper 1, question 1(C).