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Which solution will have highest boiling point

Which solution will have highest boiling point:
(a) 1% solution of glucose in water  (b) 1% solution of sodium chloride in water  (c) 1% solution of zinc sulphate in water  (d) 1% solution of urea in water

Answer: (b) Nacl and ZnSO4 gives 2 ions but Nacl is more ionic than ZnSO4.

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