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Which of the following is less than zero for ideal solutions?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 56

The degree of dissociation of an electrolyte is a and its van’t Hoff factor is i. The number of ions obtained by complete dissociation of 1 molecule of the electrolyte is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 59
If P0 and P are the vapour pressures of a solvent and its solution, respectively, and N1 and N2 are the mole fractions of the solvent and non-volatile solute, respectively, then the correct relation is:
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 61
The vapour pressure of pure benzene, C6H6 at 50°C is 268 Torr. How many moles of non-volatile solute per mol of benzene is required to prepare a solution of benzene having a vapour pressure of 167 Torr at 50°C?
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 62
If relative decrease in vapour pressure is 0.4 for a solution containing 1 mol NaCl in 3 mol H2O, NaCl is _____ %  ionised.
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 64
Relative decrease in vapor pressure of an aqueous solution containing 2 moles [CuNH33Cl]Cl in 3 moles H2O is  0.50. On reaction with AgNO3, this solution will form (Assuming no change in degree of ionization of substance on adding AgNO3)
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 65
An aqueous solution containing 1 g of urea boils at 100.25°C. The aqueous solution containing 3 g of glucose in the same volume will boil at
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 66
Elevation in boiling point was 0.52°C when 6 g of a compound X was dissolved in 100 g of water. Molecular weight of X is Kb=0.52 kg mol-1
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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-1>Q 67
A solute S undergoes a reversible trimerization, when dissolved in a certain solvent. The boiling point elevation of its 0.1 molal solution was found to be identical to the boiling point elevation in case of a 0.08 molal solution of a solute which neither undergoes association nor dissociation. To what percent had the solute ‘S’ undergone trimerization?