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# The degree of dissociation of $Ca(NO_3)_2$ in a dilute aqueous solution, containing 7.0g of the salt per 100g water at 100$^{\large\circ}$C is 70 per cent. If the vapour pressure of water at 100°C is 760 mm, calculate vapour pressure of the solution.

746.27mm
Hence (A) is the correct answer.