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Statement The water pouch of instant ...

Statement The water pouch of instant cold pack for treating athletic injuries breakes when squeezed and `NH_(4)NO_(3)` dissolves lowering the temperature.
Explanation Addition of non-volatile solute into solvent results into depression of freezing point of solvent.

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Assertion : Sea water boils at higher temperature than distilled water Reason : Addition of non volatile solute to a solvent lowers the vapour pressure

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Graphically explain why a solution obtained by dissolving a non-volatile solue in a volatile solvent, freezes at a lower, temperature than that of pure solvent.

When solid NH_(4)NO_(3) is dissolved in water at 25^(@)C , the temperature of the solution decreases. What is true about the signs of DeltaH and DeltaS for this process?