02. Lowering of Vapour Pressure
SOLUTIONS

277331 $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

1 $\mathrm{NaCl}$ solution will show higher elevation of boiling point
2 Glucose solution will show higher elevation of boiling point
3 Both the solutions will show equal elevation of boiling point
4 The boiling point elevation will be shown by neither of the solutions
SOLUTIONS

277332 Which of the following aqueous solution has highest freezing point?

1 0.1 molal $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
2 0.1 molal $\mathrm{BaCl}_{2}$
3 0.1 molal $\mathrm{AlCl}_{3}$
4 0.1 molal $\mathrm{NH}_{4} \mathrm{Cl}$
SOLUTIONS

277333 What will be the boiling point of $30 \mathrm{~g}$ benzene containing $0.75 \mathrm{~g}$ of benzoic acid which undergoes $75 \%$ dimerization? Boiling point of pure benzene $=80.1^{\circ} \mathrm{C}$ and $K_{b}=2.53 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}$

1 $90.52^{\circ} \mathrm{C}$
2 $104.35^{\circ} \mathrm{C}$
3 $76.12^{\circ} \mathrm{C}$
4 $80.42^{\circ} \mathrm{C}$
SOLUTIONS

277334 If $P^{0}$ and $P$ are the vapour pressure of the pure solvent and solution and $n_{1}$ and $n_{2}$ are the moles of solute and solvent respectively in the solution then the correct relation between $P$ and $P^{0}$ is

1 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
2 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
3 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
4 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
SOLUTIONS

277335 $31 \mathrm{~g}$ of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ is mixed with $500 \mathrm{~g}$ of solvent $\left(\mathrm{K}_{f}\right.$ of the solvent is $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-}$ 1). What is the freezing point of the solution (in K)? (Freezing point of solvent $=\mathbf{2 7 3} \mathrm{K}$ )

1 272
2 271
3 270
4 274
SOLUTIONS

277331 $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

1 $\mathrm{NaCl}$ solution will show higher elevation of boiling point
2 Glucose solution will show higher elevation of boiling point
3 Both the solutions will show equal elevation of boiling point
4 The boiling point elevation will be shown by neither of the solutions
SOLUTIONS

277332 Which of the following aqueous solution has highest freezing point?

1 0.1 molal $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
2 0.1 molal $\mathrm{BaCl}_{2}$
3 0.1 molal $\mathrm{AlCl}_{3}$
4 0.1 molal $\mathrm{NH}_{4} \mathrm{Cl}$
SOLUTIONS

277333 What will be the boiling point of $30 \mathrm{~g}$ benzene containing $0.75 \mathrm{~g}$ of benzoic acid which undergoes $75 \%$ dimerization? Boiling point of pure benzene $=80.1^{\circ} \mathrm{C}$ and $K_{b}=2.53 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}$

1 $90.52^{\circ} \mathrm{C}$
2 $104.35^{\circ} \mathrm{C}$
3 $76.12^{\circ} \mathrm{C}$
4 $80.42^{\circ} \mathrm{C}$
SOLUTIONS

277334 If $P^{0}$ and $P$ are the vapour pressure of the pure solvent and solution and $n_{1}$ and $n_{2}$ are the moles of solute and solvent respectively in the solution then the correct relation between $P$ and $P^{0}$ is

1 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
2 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
3 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
4 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
SOLUTIONS

277335 $31 \mathrm{~g}$ of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ is mixed with $500 \mathrm{~g}$ of solvent $\left(\mathrm{K}_{f}\right.$ of the solvent is $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-}$ 1). What is the freezing point of the solution (in K)? (Freezing point of solvent $=\mathbf{2 7 3} \mathrm{K}$ )

1 272
2 271
3 270
4 274
SOLUTIONS

277331 $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

1 $\mathrm{NaCl}$ solution will show higher elevation of boiling point
2 Glucose solution will show higher elevation of boiling point
3 Both the solutions will show equal elevation of boiling point
4 The boiling point elevation will be shown by neither of the solutions
SOLUTIONS

277332 Which of the following aqueous solution has highest freezing point?

1 0.1 molal $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
2 0.1 molal $\mathrm{BaCl}_{2}$
3 0.1 molal $\mathrm{AlCl}_{3}$
4 0.1 molal $\mathrm{NH}_{4} \mathrm{Cl}$
SOLUTIONS

277333 What will be the boiling point of $30 \mathrm{~g}$ benzene containing $0.75 \mathrm{~g}$ of benzoic acid which undergoes $75 \%$ dimerization? Boiling point of pure benzene $=80.1^{\circ} \mathrm{C}$ and $K_{b}=2.53 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}$

1 $90.52^{\circ} \mathrm{C}$
2 $104.35^{\circ} \mathrm{C}$
3 $76.12^{\circ} \mathrm{C}$
4 $80.42^{\circ} \mathrm{C}$
SOLUTIONS

277334 If $P^{0}$ and $P$ are the vapour pressure of the pure solvent and solution and $n_{1}$ and $n_{2}$ are the moles of solute and solvent respectively in the solution then the correct relation between $P$ and $P^{0}$ is

1 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
2 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
3 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
4 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
SOLUTIONS

277335 $31 \mathrm{~g}$ of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ is mixed with $500 \mathrm{~g}$ of solvent $\left(\mathrm{K}_{f}\right.$ of the solvent is $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-}$ 1). What is the freezing point of the solution (in K)? (Freezing point of solvent $=\mathbf{2 7 3} \mathrm{K}$ )

1 272
2 271
3 270
4 274
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SOLUTIONS

277331 $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

1 $\mathrm{NaCl}$ solution will show higher elevation of boiling point
2 Glucose solution will show higher elevation of boiling point
3 Both the solutions will show equal elevation of boiling point
4 The boiling point elevation will be shown by neither of the solutions
SOLUTIONS

277332 Which of the following aqueous solution has highest freezing point?

1 0.1 molal $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
2 0.1 molal $\mathrm{BaCl}_{2}$
3 0.1 molal $\mathrm{AlCl}_{3}$
4 0.1 molal $\mathrm{NH}_{4} \mathrm{Cl}$
SOLUTIONS

277333 What will be the boiling point of $30 \mathrm{~g}$ benzene containing $0.75 \mathrm{~g}$ of benzoic acid which undergoes $75 \%$ dimerization? Boiling point of pure benzene $=80.1^{\circ} \mathrm{C}$ and $K_{b}=2.53 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}$

1 $90.52^{\circ} \mathrm{C}$
2 $104.35^{\circ} \mathrm{C}$
3 $76.12^{\circ} \mathrm{C}$
4 $80.42^{\circ} \mathrm{C}$
SOLUTIONS

277334 If $P^{0}$ and $P$ are the vapour pressure of the pure solvent and solution and $n_{1}$ and $n_{2}$ are the moles of solute and solvent respectively in the solution then the correct relation between $P$ and $P^{0}$ is

1 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
2 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
3 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
4 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
SOLUTIONS

277335 $31 \mathrm{~g}$ of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ is mixed with $500 \mathrm{~g}$ of solvent $\left(\mathrm{K}_{f}\right.$ of the solvent is $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-}$ 1). What is the freezing point of the solution (in K)? (Freezing point of solvent $=\mathbf{2 7 3} \mathrm{K}$ )

1 272
2 271
3 270
4 274
SOLUTIONS

277331 $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ and $180 \mathrm{~g}$ of glucose were separately dissolved in $1000 \mathrm{~mL}$ of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

1 $\mathrm{NaCl}$ solution will show higher elevation of boiling point
2 Glucose solution will show higher elevation of boiling point
3 Both the solutions will show equal elevation of boiling point
4 The boiling point elevation will be shown by neither of the solutions
SOLUTIONS

277332 Which of the following aqueous solution has highest freezing point?

1 0.1 molal $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
2 0.1 molal $\mathrm{BaCl}_{2}$
3 0.1 molal $\mathrm{AlCl}_{3}$
4 0.1 molal $\mathrm{NH}_{4} \mathrm{Cl}$
SOLUTIONS

277333 What will be the boiling point of $30 \mathrm{~g}$ benzene containing $0.75 \mathrm{~g}$ of benzoic acid which undergoes $75 \%$ dimerization? Boiling point of pure benzene $=80.1^{\circ} \mathrm{C}$ and $K_{b}=2.53 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}$

1 $90.52^{\circ} \mathrm{C}$
2 $104.35^{\circ} \mathrm{C}$
3 $76.12^{\circ} \mathrm{C}$
4 $80.42^{\circ} \mathrm{C}$
SOLUTIONS

277334 If $P^{0}$ and $P$ are the vapour pressure of the pure solvent and solution and $n_{1}$ and $n_{2}$ are the moles of solute and solvent respectively in the solution then the correct relation between $P$ and $P^{0}$ is

1 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
2 $\mathrm{P}^{\mathrm{o}}=\mathrm{P}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
3 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{2}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
4 $\mathrm{P}=\mathrm{P}^{\mathrm{o}}\left[\frac{\mathrm{n}_{1}}{\mathrm{n}_{1}+\mathrm{n}_{2}}\right]$
SOLUTIONS

277335 $31 \mathrm{~g}$ of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ is mixed with $500 \mathrm{~g}$ of solvent $\left(\mathrm{K}_{f}\right.$ of the solvent is $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-}$ 1). What is the freezing point of the solution (in K)? (Freezing point of solvent $=\mathbf{2 7 3} \mathrm{K}$ )

1 272
2 271
3 270
4 274