Most soluble in water is ¾.

ক. camphor

খ. common salt

গ. sugar

ঘ. salphur

উত্তর: sugar

ব্যাখ্যা: Among the given options, sugar is the most soluble in water. Camphor is sparingly soluble, and sulphur is virtually insoluble due to their non-polar nature or limited interaction with water. Both common salt (ionic) and sugar (due to hydrogen bonding) are highly soluble, but sugar exhibits significantly higher solubility by mass in water compared to common salt at typical temperatures.

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