02. Lowering of Vapour Pressure
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SOLUTIONS

277297 18g of glucose $\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right)$ is added to $178.2 \mathrm{~g}$ water. The vapour pressure of water (in torr) for this aqueous solution is

1 76.0
2 752.4
3 759.0
4 7.6
SOLUTIONS

277299 The relative lowering of vapour pressure of aqueous solution containing non-volatile solute is 0.0125 . The molality of the solution is

1 0.70
2 0.50
3 0.60
4 0.80
5 0.40
SOLUTIONS

277309 A set of solutions is prepared using $180 \mathrm{~g}$ of water as a solvent and $10 \mathrm{~g}$ of different nonvolatile solutes $A, B$ and $C$. The relative lowering of vapour pressure in the presence of these solutes are in the order
[Given, molar mass of $A=100 \mathrm{~g} \mathrm{~mol}^{-1}: B=200 \mathrm{~g}$ $\mathrm{mol}^{-1}: \mathrm{C}=\mathbf{1 0 , 0 0 0 \mathrm { g } \mathrm { mol } ^ { - 1 } ]}$

1 $\mathrm{B}>\mathrm{C}>\mathrm{A}$
2 $\mathrm{C}>\mathrm{B}>\mathrm{A}$
3 $\mathrm{A}>\mathrm{B}>\mathrm{C}$
4 $\mathrm{A}>\mathrm{C}>\mathrm{B}$
SOLUTIONS

277300 The vapour pressure of benzene at a certain temperature is $640 \mathrm{~mm}$ of $\mathrm{Hg}$. A non-volatile and non-electrolyte solid weighing $2.175 \mathrm{~g}$ is added to $39.08 \mathrm{~g}$ of benzene. If the vapour pressure of the solution is $600 \mathrm{~mm}$ of $\mathrm{Hg}$, what is the molecular weight of solid substance?

1 49.50
2 59.60
3 69.60
4 79.82
SOLUTIONS

277297 18g of glucose $\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right)$ is added to $178.2 \mathrm{~g}$ water. The vapour pressure of water (in torr) for this aqueous solution is

1 76.0
2 752.4
3 759.0
4 7.6
SOLUTIONS

277299 The relative lowering of vapour pressure of aqueous solution containing non-volatile solute is 0.0125 . The molality of the solution is

1 0.70
2 0.50
3 0.60
4 0.80
5 0.40
SOLUTIONS

277309 A set of solutions is prepared using $180 \mathrm{~g}$ of water as a solvent and $10 \mathrm{~g}$ of different nonvolatile solutes $A, B$ and $C$. The relative lowering of vapour pressure in the presence of these solutes are in the order
[Given, molar mass of $A=100 \mathrm{~g} \mathrm{~mol}^{-1}: B=200 \mathrm{~g}$ $\mathrm{mol}^{-1}: \mathrm{C}=\mathbf{1 0 , 0 0 0 \mathrm { g } \mathrm { mol } ^ { - 1 } ]}$

1 $\mathrm{B}>\mathrm{C}>\mathrm{A}$
2 $\mathrm{C}>\mathrm{B}>\mathrm{A}$
3 $\mathrm{A}>\mathrm{B}>\mathrm{C}$
4 $\mathrm{A}>\mathrm{C}>\mathrm{B}$
SOLUTIONS

277300 The vapour pressure of benzene at a certain temperature is $640 \mathrm{~mm}$ of $\mathrm{Hg}$. A non-volatile and non-electrolyte solid weighing $2.175 \mathrm{~g}$ is added to $39.08 \mathrm{~g}$ of benzene. If the vapour pressure of the solution is $600 \mathrm{~mm}$ of $\mathrm{Hg}$, what is the molecular weight of solid substance?

1 49.50
2 59.60
3 69.60
4 79.82
SOLUTIONS

277297 18g of glucose $\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right)$ is added to $178.2 \mathrm{~g}$ water. The vapour pressure of water (in torr) for this aqueous solution is

1 76.0
2 752.4
3 759.0
4 7.6
SOLUTIONS

277299 The relative lowering of vapour pressure of aqueous solution containing non-volatile solute is 0.0125 . The molality of the solution is

1 0.70
2 0.50
3 0.60
4 0.80
5 0.40
SOLUTIONS

277309 A set of solutions is prepared using $180 \mathrm{~g}$ of water as a solvent and $10 \mathrm{~g}$ of different nonvolatile solutes $A, B$ and $C$. The relative lowering of vapour pressure in the presence of these solutes are in the order
[Given, molar mass of $A=100 \mathrm{~g} \mathrm{~mol}^{-1}: B=200 \mathrm{~g}$ $\mathrm{mol}^{-1}: \mathrm{C}=\mathbf{1 0 , 0 0 0 \mathrm { g } \mathrm { mol } ^ { - 1 } ]}$

1 $\mathrm{B}>\mathrm{C}>\mathrm{A}$
2 $\mathrm{C}>\mathrm{B}>\mathrm{A}$
3 $\mathrm{A}>\mathrm{B}>\mathrm{C}$
4 $\mathrm{A}>\mathrm{C}>\mathrm{B}$
SOLUTIONS

277300 The vapour pressure of benzene at a certain temperature is $640 \mathrm{~mm}$ of $\mathrm{Hg}$. A non-volatile and non-electrolyte solid weighing $2.175 \mathrm{~g}$ is added to $39.08 \mathrm{~g}$ of benzene. If the vapour pressure of the solution is $600 \mathrm{~mm}$ of $\mathrm{Hg}$, what is the molecular weight of solid substance?

1 49.50
2 59.60
3 69.60
4 79.82
SOLUTIONS

277297 18g of glucose $\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right)$ is added to $178.2 \mathrm{~g}$ water. The vapour pressure of water (in torr) for this aqueous solution is

1 76.0
2 752.4
3 759.0
4 7.6
SOLUTIONS

277299 The relative lowering of vapour pressure of aqueous solution containing non-volatile solute is 0.0125 . The molality of the solution is

1 0.70
2 0.50
3 0.60
4 0.80
5 0.40
SOLUTIONS

277309 A set of solutions is prepared using $180 \mathrm{~g}$ of water as a solvent and $10 \mathrm{~g}$ of different nonvolatile solutes $A, B$ and $C$. The relative lowering of vapour pressure in the presence of these solutes are in the order
[Given, molar mass of $A=100 \mathrm{~g} \mathrm{~mol}^{-1}: B=200 \mathrm{~g}$ $\mathrm{mol}^{-1}: \mathrm{C}=\mathbf{1 0 , 0 0 0 \mathrm { g } \mathrm { mol } ^ { - 1 } ]}$

1 $\mathrm{B}>\mathrm{C}>\mathrm{A}$
2 $\mathrm{C}>\mathrm{B}>\mathrm{A}$
3 $\mathrm{A}>\mathrm{B}>\mathrm{C}$
4 $\mathrm{A}>\mathrm{C}>\mathrm{B}$
SOLUTIONS

277300 The vapour pressure of benzene at a certain temperature is $640 \mathrm{~mm}$ of $\mathrm{Hg}$. A non-volatile and non-electrolyte solid weighing $2.175 \mathrm{~g}$ is added to $39.08 \mathrm{~g}$ of benzene. If the vapour pressure of the solution is $600 \mathrm{~mm}$ of $\mathrm{Hg}$, what is the molecular weight of solid substance?

1 49.50
2 59.60
3 69.60
4 79.82