Why is the curve for freezing of a solution different in slope from the freezing of solvent?​

its first and third is your answer i did the qustion the fourth isnt right

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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answerlinnaeus;