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Q.What is molal depression constant ?
Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2026Subjective· 2mImportance★★★★★est
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Start your 14-day free trial to unlock the full solution →The question asks us to define the molal depression constant (cryoscopic constant, Kf).
Kf is the freezing-point depression caused by dissolving 1 mole of solute in 1 kg of solvent; it is a constant characteristic of the solvent.
When a non-volatile solute is dissolved in a solvent, the freezing point of the solution falls below that of the pure solvent. This depression of freezing point (ΔTf) is a colligative property and is directly proportional to the molality (m) of the solution:
ΔTf = Kf × m …
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