An ice-skating rink has tubes under its floor to freeze the water. salt water is cooled well below the freezing point of water a
nd pumped through the tubes to freeze the water in the rink. why can the salt water be cooled so low without freezing? f salt has a very low freezing point. g adding salt to water lowers its freezing point. h the salt water is constantly absorbing energy from its surroundings. j movement of the salt water through the tubes keeps it in the liquid state.
Correct Answer: Option g: <span>adding salt to water lowers its freezing point
Reason: Freezing point is a colligative property. When a non-volatile solution is present in solution, it's freezing point decreases. This is referred as depression in freezing point (</span>ΔTf<span>). Extent of lowering in freezing point is dependent on number of particles present in system. Mathematically it is expressed as:
</span>ΔTf = Kf X m <span> where, m = molality of solution Kf = cryoscopic constant.
Hence, a</span><span>dding salt to water lowers the freezing point of solution.</span>
D. Being cold temperatures can result in a cold nose. With prolonged exposure The body will start to lose heat faster than it can generate it, this is the result of hypothermia.
