Elevation in Boiling Point
CHXII02:SOLUTIONS

319149 Boiling point of \({\mathrm{\mathrm{CHCl}_{3}}}\) was raised by 0.29 K when 0.5 g anthracene was dissolved in 35 g \({\mathrm{\mathrm{CHCl}_{3}}}\). Molecular mass of anthracene is 178 u . The boiling point elevation constant \({\mathrm{\left(\mathrm{K}_{\mathrm{b}}\right)}}\) of \({\mathrm{\mathrm{CHCl}_{3}}}\) is ____ \({\text{K}}\;{\text{kg}}\;{\text{mo}}{{\text{l}}^{ - 1}}\).

1 3.61
2 35
3 0.5
4 1
CHXII02:SOLUTIONS

319150 The heat of vaporisation of benzene is \(7353 \,\mathrm{cal}\)
\(\mathrm{mol}^{-1}\). The approximate bpt. of benzene is

1 \(77.1^{\circ} \mathrm{C}\)
2 \(87.1^{\circ} \mathrm{C}\)
3 \(101^{\circ} \mathrm{C}\)
4 \(95^{\circ} \mathrm{C}\)
CHXII02:SOLUTIONS

319151 A compound has the empirical formula \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\). A solution of 0.26 g of the compound in 11.2 g of benzene \(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}} \right)\) boils at \({\rm{80}}{\rm{.2}}{{\rm{6}}^{\rm{^\circ }}}{\rm{C}}\). The boiling point of benzene is \({\rm{80}}{\rm{.10^\circ C}}\,\,{\rm{and}}\,\,{{\rm{K}}_{\rm{b}}}\,\,{\rm{is}}\,\,{\rm{2}}{\rm{.53^\circ C/molal}}\). What is the molecular formula of the compound ?

1 \({{\rm{C}}_{{\rm{30}}}}{{\rm{H}}_{{\rm{24}}}}{\rm{F}}{{\rm{e}}_{\rm{3}}}\)
2 \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\)
3 \({{\rm{C}}_{\rm{5}}}{{\rm{H}}_{\rm{4}}}{\rm{Fe}}\)
4 \({{\rm{C}}_{{\rm{20}}}}{{\rm{H}}_{{\rm{16}}}}{\rm{F}}{{\rm{e}}_{\rm{2}}}\)
CHXII02:SOLUTIONS

319152 Assertion :
Equimolal solutions of different non volatile and non-electrolytic substance dissolved in the same solvent exhibit the same elevation of boiling point
Reason :
All solvents boil when their vapour pressures become equal to the atmospheric pressure.

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
CHXII02:SOLUTIONS

319153 Normal boiling point \(\left( {{{\rm{T}}_{\rm{N}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1atm and standard boiling point \(\left( {{{\rm{T}}_{\rm{S}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1 bar. Which one is not correct if water is considered?

1 \({{\rm{T}}_{\rm{N}}}{\rm{ = 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
2 \({{\rm{T}}_{\rm{S}}}{\rm{ > 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
3 \({{\rm{T}}_{\rm{S}}}{\rm{ < 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
4 \({{\rm{T}}_{\rm{S}}}{\rm{ < }}{{\rm{T}}_{\rm{N}}}\)
CHXII02:SOLUTIONS

319149 Boiling point of \({\mathrm{\mathrm{CHCl}_{3}}}\) was raised by 0.29 K when 0.5 g anthracene was dissolved in 35 g \({\mathrm{\mathrm{CHCl}_{3}}}\). Molecular mass of anthracene is 178 u . The boiling point elevation constant \({\mathrm{\left(\mathrm{K}_{\mathrm{b}}\right)}}\) of \({\mathrm{\mathrm{CHCl}_{3}}}\) is ____ \({\text{K}}\;{\text{kg}}\;{\text{mo}}{{\text{l}}^{ - 1}}\).

1 3.61
2 35
3 0.5
4 1
CHXII02:SOLUTIONS

319150 The heat of vaporisation of benzene is \(7353 \,\mathrm{cal}\)
\(\mathrm{mol}^{-1}\). The approximate bpt. of benzene is

1 \(77.1^{\circ} \mathrm{C}\)
2 \(87.1^{\circ} \mathrm{C}\)
3 \(101^{\circ} \mathrm{C}\)
4 \(95^{\circ} \mathrm{C}\)
CHXII02:SOLUTIONS

319151 A compound has the empirical formula \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\). A solution of 0.26 g of the compound in 11.2 g of benzene \(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}} \right)\) boils at \({\rm{80}}{\rm{.2}}{{\rm{6}}^{\rm{^\circ }}}{\rm{C}}\). The boiling point of benzene is \({\rm{80}}{\rm{.10^\circ C}}\,\,{\rm{and}}\,\,{{\rm{K}}_{\rm{b}}}\,\,{\rm{is}}\,\,{\rm{2}}{\rm{.53^\circ C/molal}}\). What is the molecular formula of the compound ?

1 \({{\rm{C}}_{{\rm{30}}}}{{\rm{H}}_{{\rm{24}}}}{\rm{F}}{{\rm{e}}_{\rm{3}}}\)
2 \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\)
3 \({{\rm{C}}_{\rm{5}}}{{\rm{H}}_{\rm{4}}}{\rm{Fe}}\)
4 \({{\rm{C}}_{{\rm{20}}}}{{\rm{H}}_{{\rm{16}}}}{\rm{F}}{{\rm{e}}_{\rm{2}}}\)
CHXII02:SOLUTIONS

319152 Assertion :
Equimolal solutions of different non volatile and non-electrolytic substance dissolved in the same solvent exhibit the same elevation of boiling point
Reason :
All solvents boil when their vapour pressures become equal to the atmospheric pressure.

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
CHXII02:SOLUTIONS

319153 Normal boiling point \(\left( {{{\rm{T}}_{\rm{N}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1atm and standard boiling point \(\left( {{{\rm{T}}_{\rm{S}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1 bar. Which one is not correct if water is considered?

1 \({{\rm{T}}_{\rm{N}}}{\rm{ = 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
2 \({{\rm{T}}_{\rm{S}}}{\rm{ > 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
3 \({{\rm{T}}_{\rm{S}}}{\rm{ < 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
4 \({{\rm{T}}_{\rm{S}}}{\rm{ < }}{{\rm{T}}_{\rm{N}}}\)
CHXII02:SOLUTIONS

319149 Boiling point of \({\mathrm{\mathrm{CHCl}_{3}}}\) was raised by 0.29 K when 0.5 g anthracene was dissolved in 35 g \({\mathrm{\mathrm{CHCl}_{3}}}\). Molecular mass of anthracene is 178 u . The boiling point elevation constant \({\mathrm{\left(\mathrm{K}_{\mathrm{b}}\right)}}\) of \({\mathrm{\mathrm{CHCl}_{3}}}\) is ____ \({\text{K}}\;{\text{kg}}\;{\text{mo}}{{\text{l}}^{ - 1}}\).

1 3.61
2 35
3 0.5
4 1
CHXII02:SOLUTIONS

319150 The heat of vaporisation of benzene is \(7353 \,\mathrm{cal}\)
\(\mathrm{mol}^{-1}\). The approximate bpt. of benzene is

1 \(77.1^{\circ} \mathrm{C}\)
2 \(87.1^{\circ} \mathrm{C}\)
3 \(101^{\circ} \mathrm{C}\)
4 \(95^{\circ} \mathrm{C}\)
CHXII02:SOLUTIONS

319151 A compound has the empirical formula \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\). A solution of 0.26 g of the compound in 11.2 g of benzene \(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}} \right)\) boils at \({\rm{80}}{\rm{.2}}{{\rm{6}}^{\rm{^\circ }}}{\rm{C}}\). The boiling point of benzene is \({\rm{80}}{\rm{.10^\circ C}}\,\,{\rm{and}}\,\,{{\rm{K}}_{\rm{b}}}\,\,{\rm{is}}\,\,{\rm{2}}{\rm{.53^\circ C/molal}}\). What is the molecular formula of the compound ?

1 \({{\rm{C}}_{{\rm{30}}}}{{\rm{H}}_{{\rm{24}}}}{\rm{F}}{{\rm{e}}_{\rm{3}}}\)
2 \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\)
3 \({{\rm{C}}_{\rm{5}}}{{\rm{H}}_{\rm{4}}}{\rm{Fe}}\)
4 \({{\rm{C}}_{{\rm{20}}}}{{\rm{H}}_{{\rm{16}}}}{\rm{F}}{{\rm{e}}_{\rm{2}}}\)
CHXII02:SOLUTIONS

319152 Assertion :
Equimolal solutions of different non volatile and non-electrolytic substance dissolved in the same solvent exhibit the same elevation of boiling point
Reason :
All solvents boil when their vapour pressures become equal to the atmospheric pressure.

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
CHXII02:SOLUTIONS

319153 Normal boiling point \(\left( {{{\rm{T}}_{\rm{N}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1atm and standard boiling point \(\left( {{{\rm{T}}_{\rm{S}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1 bar. Which one is not correct if water is considered?

1 \({{\rm{T}}_{\rm{N}}}{\rm{ = 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
2 \({{\rm{T}}_{\rm{S}}}{\rm{ > 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
3 \({{\rm{T}}_{\rm{S}}}{\rm{ < 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
4 \({{\rm{T}}_{\rm{S}}}{\rm{ < }}{{\rm{T}}_{\rm{N}}}\)
CHXII02:SOLUTIONS

319149 Boiling point of \({\mathrm{\mathrm{CHCl}_{3}}}\) was raised by 0.29 K when 0.5 g anthracene was dissolved in 35 g \({\mathrm{\mathrm{CHCl}_{3}}}\). Molecular mass of anthracene is 178 u . The boiling point elevation constant \({\mathrm{\left(\mathrm{K}_{\mathrm{b}}\right)}}\) of \({\mathrm{\mathrm{CHCl}_{3}}}\) is ____ \({\text{K}}\;{\text{kg}}\;{\text{mo}}{{\text{l}}^{ - 1}}\).

1 3.61
2 35
3 0.5
4 1
CHXII02:SOLUTIONS

319150 The heat of vaporisation of benzene is \(7353 \,\mathrm{cal}\)
\(\mathrm{mol}^{-1}\). The approximate bpt. of benzene is

1 \(77.1^{\circ} \mathrm{C}\)
2 \(87.1^{\circ} \mathrm{C}\)
3 \(101^{\circ} \mathrm{C}\)
4 \(95^{\circ} \mathrm{C}\)
CHXII02:SOLUTIONS

319151 A compound has the empirical formula \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\). A solution of 0.26 g of the compound in 11.2 g of benzene \(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}} \right)\) boils at \({\rm{80}}{\rm{.2}}{{\rm{6}}^{\rm{^\circ }}}{\rm{C}}\). The boiling point of benzene is \({\rm{80}}{\rm{.10^\circ C}}\,\,{\rm{and}}\,\,{{\rm{K}}_{\rm{b}}}\,\,{\rm{is}}\,\,{\rm{2}}{\rm{.53^\circ C/molal}}\). What is the molecular formula of the compound ?

1 \({{\rm{C}}_{{\rm{30}}}}{{\rm{H}}_{{\rm{24}}}}{\rm{F}}{{\rm{e}}_{\rm{3}}}\)
2 \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\)
3 \({{\rm{C}}_{\rm{5}}}{{\rm{H}}_{\rm{4}}}{\rm{Fe}}\)
4 \({{\rm{C}}_{{\rm{20}}}}{{\rm{H}}_{{\rm{16}}}}{\rm{F}}{{\rm{e}}_{\rm{2}}}\)
CHXII02:SOLUTIONS

319152 Assertion :
Equimolal solutions of different non volatile and non-electrolytic substance dissolved in the same solvent exhibit the same elevation of boiling point
Reason :
All solvents boil when their vapour pressures become equal to the atmospheric pressure.

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
CHXII02:SOLUTIONS

319153 Normal boiling point \(\left( {{{\rm{T}}_{\rm{N}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1atm and standard boiling point \(\left( {{{\rm{T}}_{\rm{S}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1 bar. Which one is not correct if water is considered?

1 \({{\rm{T}}_{\rm{N}}}{\rm{ = 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
2 \({{\rm{T}}_{\rm{S}}}{\rm{ > 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
3 \({{\rm{T}}_{\rm{S}}}{\rm{ < 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
4 \({{\rm{T}}_{\rm{S}}}{\rm{ < }}{{\rm{T}}_{\rm{N}}}\)
CHXII02:SOLUTIONS

319149 Boiling point of \({\mathrm{\mathrm{CHCl}_{3}}}\) was raised by 0.29 K when 0.5 g anthracene was dissolved in 35 g \({\mathrm{\mathrm{CHCl}_{3}}}\). Molecular mass of anthracene is 178 u . The boiling point elevation constant \({\mathrm{\left(\mathrm{K}_{\mathrm{b}}\right)}}\) of \({\mathrm{\mathrm{CHCl}_{3}}}\) is ____ \({\text{K}}\;{\text{kg}}\;{\text{mo}}{{\text{l}}^{ - 1}}\).

1 3.61
2 35
3 0.5
4 1
CHXII02:SOLUTIONS

319150 The heat of vaporisation of benzene is \(7353 \,\mathrm{cal}\)
\(\mathrm{mol}^{-1}\). The approximate bpt. of benzene is

1 \(77.1^{\circ} \mathrm{C}\)
2 \(87.1^{\circ} \mathrm{C}\)
3 \(101^{\circ} \mathrm{C}\)
4 \(95^{\circ} \mathrm{C}\)
CHXII02:SOLUTIONS

319151 A compound has the empirical formula \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\). A solution of 0.26 g of the compound in 11.2 g of benzene \(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}} \right)\) boils at \({\rm{80}}{\rm{.2}}{{\rm{6}}^{\rm{^\circ }}}{\rm{C}}\). The boiling point of benzene is \({\rm{80}}{\rm{.10^\circ C}}\,\,{\rm{and}}\,\,{{\rm{K}}_{\rm{b}}}\,\,{\rm{is}}\,\,{\rm{2}}{\rm{.53^\circ C/molal}}\). What is the molecular formula of the compound ?

1 \({{\rm{C}}_{{\rm{30}}}}{{\rm{H}}_{{\rm{24}}}}{\rm{F}}{{\rm{e}}_{\rm{3}}}\)
2 \({{\rm{C}}_{{\rm{10}}}}{{\rm{H}}_{\rm{8}}}{\rm{Fe}}\)
3 \({{\rm{C}}_{\rm{5}}}{{\rm{H}}_{\rm{4}}}{\rm{Fe}}\)
4 \({{\rm{C}}_{{\rm{20}}}}{{\rm{H}}_{{\rm{16}}}}{\rm{F}}{{\rm{e}}_{\rm{2}}}\)
CHXII02:SOLUTIONS

319152 Assertion :
Equimolal solutions of different non volatile and non-electrolytic substance dissolved in the same solvent exhibit the same elevation of boiling point
Reason :
All solvents boil when their vapour pressures become equal to the atmospheric pressure.

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
CHXII02:SOLUTIONS

319153 Normal boiling point \(\left( {{{\rm{T}}_{\rm{N}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1atm and standard boiling point \(\left( {{{\rm{T}}_{\rm{S}}}} \right)\) is defined as the temperature when vapour pressure of liquid becomes equal to 1 bar. Which one is not correct if water is considered?

1 \({{\rm{T}}_{\rm{N}}}{\rm{ = 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
2 \({{\rm{T}}_{\rm{S}}}{\rm{ > 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
3 \({{\rm{T}}_{\rm{S}}}{\rm{ < 10}}{{\rm{0}}^{\rm{^\circ }}}{\rm{C}}\)
4 \({{\rm{T}}_{\rm{S}}}{\rm{ < }}{{\rm{T}}_{\rm{N}}}\)