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Q.

A solution containing 25.6gm of sulphur dissolved in 1000gm of naphthalene gave a freezing point lowering of 0.680, then molecular formula of sulphur is (KF for naphthalene = 6.8K kg mol–1)

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answer is 4.

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Detailed Solution

Kf for Naphthalene = 6.8KKgmole-1GMW of sulphur = 256we know, GAW of sulphur = 32Molecular Formula = S8
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A solution containing 25.6gm of sulphur dissolved in 1000gm of naphthalene gave a freezing point lowering of 0.680, then molecular formula of sulphur is (KF for naphthalene = 6.8K kg mol–1)