02. Lowering of Vapour Pressure
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SOLUTIONS

277310 Solute ' $X$ ' dimerises in water to the extent of $80 \% .2 .5 \mathrm{~g}$ of ' $\mathrm{X}$ ' in $100 \mathrm{~g}$ of water increases the boiling point by $0.3^{\circ} \mathrm{C}$. The molar mass of ' $\mathrm{X}$ ' is $\left[\mathrm{K}_{\mathrm{b}}=\mathbf{0 . 5 2} \mathrm{K} \mathrm{kg} \mathrm{mol}^{-1}\right.$ ]

1 13
2 52
3 65
4 26
SOLUTIONS

277317 The elevation in boiling point of 0.25 molal aqueous solution of a substance is $\left(K_{b}=0.52 \mathrm{~K}\right.$ kg mol-1)

1 $0.15 \mathrm{~K}$
2 $0.50 \mathrm{~K}$
3 $0.13 \mathrm{~K}$
4 $2.08 \mathrm{~K}$
SOLUTIONS

277318 9 gram anhydrous oxalic acid (mol. wt. $=90$ ) was dissolved in 9.9 moles of water. If vapour pressure of pure water is $p_{1}{ }^{0} 1$ the vapour pressure of solution is

1 $0.99 \mathrm{p}_{1}{ }^{0}$
2 $0.1 \mathrm{p}_{1}^{0}$
3 $0.99 \mathrm{p}_{1}{ }^{0}$
4 $1.1 \mathrm{p}_{1}^{0}$
SOLUTIONS

277319 Relative lowering of vapour pressure of a dilute solution of glucose dissolved in $1 \mathrm{~kg}$ of water is 0.002. The molality of the solution is

1 0.004
2 0.222
3 0.111
4 0.021
SOLUTIONS

277310 Solute ' $X$ ' dimerises in water to the extent of $80 \% .2 .5 \mathrm{~g}$ of ' $\mathrm{X}$ ' in $100 \mathrm{~g}$ of water increases the boiling point by $0.3^{\circ} \mathrm{C}$. The molar mass of ' $\mathrm{X}$ ' is $\left[\mathrm{K}_{\mathrm{b}}=\mathbf{0 . 5 2} \mathrm{K} \mathrm{kg} \mathrm{mol}^{-1}\right.$ ]

1 13
2 52
3 65
4 26
SOLUTIONS

277317 The elevation in boiling point of 0.25 molal aqueous solution of a substance is $\left(K_{b}=0.52 \mathrm{~K}\right.$ kg mol-1)

1 $0.15 \mathrm{~K}$
2 $0.50 \mathrm{~K}$
3 $0.13 \mathrm{~K}$
4 $2.08 \mathrm{~K}$
SOLUTIONS

277318 9 gram anhydrous oxalic acid (mol. wt. $=90$ ) was dissolved in 9.9 moles of water. If vapour pressure of pure water is $p_{1}{ }^{0} 1$ the vapour pressure of solution is

1 $0.99 \mathrm{p}_{1}{ }^{0}$
2 $0.1 \mathrm{p}_{1}^{0}$
3 $0.99 \mathrm{p}_{1}{ }^{0}$
4 $1.1 \mathrm{p}_{1}^{0}$
SOLUTIONS

277319 Relative lowering of vapour pressure of a dilute solution of glucose dissolved in $1 \mathrm{~kg}$ of water is 0.002. The molality of the solution is

1 0.004
2 0.222
3 0.111
4 0.021
SOLUTIONS

277310 Solute ' $X$ ' dimerises in water to the extent of $80 \% .2 .5 \mathrm{~g}$ of ' $\mathrm{X}$ ' in $100 \mathrm{~g}$ of water increases the boiling point by $0.3^{\circ} \mathrm{C}$. The molar mass of ' $\mathrm{X}$ ' is $\left[\mathrm{K}_{\mathrm{b}}=\mathbf{0 . 5 2} \mathrm{K} \mathrm{kg} \mathrm{mol}^{-1}\right.$ ]

1 13
2 52
3 65
4 26
SOLUTIONS

277317 The elevation in boiling point of 0.25 molal aqueous solution of a substance is $\left(K_{b}=0.52 \mathrm{~K}\right.$ kg mol-1)

1 $0.15 \mathrm{~K}$
2 $0.50 \mathrm{~K}$
3 $0.13 \mathrm{~K}$
4 $2.08 \mathrm{~K}$
SOLUTIONS

277318 9 gram anhydrous oxalic acid (mol. wt. $=90$ ) was dissolved in 9.9 moles of water. If vapour pressure of pure water is $p_{1}{ }^{0} 1$ the vapour pressure of solution is

1 $0.99 \mathrm{p}_{1}{ }^{0}$
2 $0.1 \mathrm{p}_{1}^{0}$
3 $0.99 \mathrm{p}_{1}{ }^{0}$
4 $1.1 \mathrm{p}_{1}^{0}$
SOLUTIONS

277319 Relative lowering of vapour pressure of a dilute solution of glucose dissolved in $1 \mathrm{~kg}$ of water is 0.002. The molality of the solution is

1 0.004
2 0.222
3 0.111
4 0.021
SOLUTIONS

277310 Solute ' $X$ ' dimerises in water to the extent of $80 \% .2 .5 \mathrm{~g}$ of ' $\mathrm{X}$ ' in $100 \mathrm{~g}$ of water increases the boiling point by $0.3^{\circ} \mathrm{C}$. The molar mass of ' $\mathrm{X}$ ' is $\left[\mathrm{K}_{\mathrm{b}}=\mathbf{0 . 5 2} \mathrm{K} \mathrm{kg} \mathrm{mol}^{-1}\right.$ ]

1 13
2 52
3 65
4 26
SOLUTIONS

277317 The elevation in boiling point of 0.25 molal aqueous solution of a substance is $\left(K_{b}=0.52 \mathrm{~K}\right.$ kg mol-1)

1 $0.15 \mathrm{~K}$
2 $0.50 \mathrm{~K}$
3 $0.13 \mathrm{~K}$
4 $2.08 \mathrm{~K}$
SOLUTIONS

277318 9 gram anhydrous oxalic acid (mol. wt. $=90$ ) was dissolved in 9.9 moles of water. If vapour pressure of pure water is $p_{1}{ }^{0} 1$ the vapour pressure of solution is

1 $0.99 \mathrm{p}_{1}{ }^{0}$
2 $0.1 \mathrm{p}_{1}^{0}$
3 $0.99 \mathrm{p}_{1}{ }^{0}$
4 $1.1 \mathrm{p}_{1}^{0}$
SOLUTIONS

277319 Relative lowering of vapour pressure of a dilute solution of glucose dissolved in $1 \mathrm{~kg}$ of water is 0.002. The molality of the solution is

1 0.004
2 0.222
3 0.111
4 0.021