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sodium chloride solution freezes at lower temperature than water but boils at higher temperature than water , explain.

HI 

sodium chloride is a volatile salt as soon as it is added to water  there is a elevation in boling point and depression in frezzing point

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 hi 

whenever sodium chloride is added to water as sodium chloride is a non volatile solute it brings elevation in boiling point and depression in frezzing point of water 

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when the NaCl is added to water it brings elevation in boiling point and depression in freezing point
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Freezing point depends on the intermolecular attraction of the liquid. When NaCl is added to the water the intermolecular forces decreases and created the attraction between the water and Na+ and Cl- ions hence depression in Freezing point.
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Give answer to this question please sir

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when a nonvolatile solute is dissolved in a solvent the vapour pressure decreases, As a result the solvent freezes at a lower temperature.
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Sodium chloride is a nonvolatile solute. when a nonvolatile solute is added in the solution then freezing point of solution decreases than that of solvent. Similarly when a nonvolatile solute is added in solution then boiling point of solution becomes larger than that of a solvent.
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