Abnormal Molar Masses and Van't Hoff Factor
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CHXII02:SOLUTIONS

318990 \(0.01 \mathrm{M}\) solutions of \(\mathrm{KCl}\) and \(\mathrm{BaCl}_{2}\) are prepared in water. The freezing point of \(\mathrm{KCl}\) is found to be \(-2{ }^{\circ} \mathrm{C}\). What is the freezing point of \(\mathrm{BaCl}_{2}\) to be completely ionised?

1 \(-3^{\circ} \mathrm{C}\)
2 \(+3^{\circ} \mathrm{C}\)
3 \(-2^{\circ} \mathrm{C}\)
4 \(-4^{\circ} \mathrm{C}\)
AIIMS - 2008
CHXII02:SOLUTIONS

318991 Calculate the number of moles of sodium sulphate required to be dissolved in 12 moles of water to lower its vapour pressure by \(10 \mathrm{mmHg}\) at a \(300 \mathrm{~K}\) temperature (V.P. of \(\mathrm{H}_{2} \mathrm{O}\) at \(300 \mathrm{~K}\) \(=50 \mathrm{mmHg}\) ):

1 2 moles
2 3 moles
3 1 mole
4 1.5 moles
CHXII02:SOLUTIONS

318992 Assuming each salt to be \(90\% \) dissociated which of the following will have highest osmotic pressure

1 Decinormal \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
2 Decinormal \({\rm{BaC}}{{\rm{l}}_{\rm{2}}}\)
3 Decinormal \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
4 A solution obtained by mixing equal volumes of (2) and (3) and filtering
CHXII02:SOLUTIONS

318993 \(1 \times {10^{ - 3}}\;{\rm{m}}\) solution of \({\rm{Pt}}{\left( {{\rm{N}}{{\rm{H}}_3}} \right)_4}{\rm{C}}{{\rm{l}}_4}\) in \({{\rm{H}}_2}{\rm{O}}\) shows depression in freezing point by \(0.0054^\circ {\rm{C}}\). The structure of the compound will be (given \({{\rm{K}}_{{\rm{sp}}}}\left( {{{\rm{H}}_2}{\rm{O}}} \right) = 1.860\;{\rm{k}}{{\rm{m}}^{ - 1}}\) )

1 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{4}\)
2 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right] \mathrm{Cl}_{3}\)
3 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}_{2}\)
4 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{3}\right] \mathrm{Cl}\)
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CHXII02:SOLUTIONS

318990 \(0.01 \mathrm{M}\) solutions of \(\mathrm{KCl}\) and \(\mathrm{BaCl}_{2}\) are prepared in water. The freezing point of \(\mathrm{KCl}\) is found to be \(-2{ }^{\circ} \mathrm{C}\). What is the freezing point of \(\mathrm{BaCl}_{2}\) to be completely ionised?

1 \(-3^{\circ} \mathrm{C}\)
2 \(+3^{\circ} \mathrm{C}\)
3 \(-2^{\circ} \mathrm{C}\)
4 \(-4^{\circ} \mathrm{C}\)
AIIMS - 2008
CHXII02:SOLUTIONS

318991 Calculate the number of moles of sodium sulphate required to be dissolved in 12 moles of water to lower its vapour pressure by \(10 \mathrm{mmHg}\) at a \(300 \mathrm{~K}\) temperature (V.P. of \(\mathrm{H}_{2} \mathrm{O}\) at \(300 \mathrm{~K}\) \(=50 \mathrm{mmHg}\) ):

1 2 moles
2 3 moles
3 1 mole
4 1.5 moles
CHXII02:SOLUTIONS

318992 Assuming each salt to be \(90\% \) dissociated which of the following will have highest osmotic pressure

1 Decinormal \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
2 Decinormal \({\rm{BaC}}{{\rm{l}}_{\rm{2}}}\)
3 Decinormal \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
4 A solution obtained by mixing equal volumes of (2) and (3) and filtering
CHXII02:SOLUTIONS

318993 \(1 \times {10^{ - 3}}\;{\rm{m}}\) solution of \({\rm{Pt}}{\left( {{\rm{N}}{{\rm{H}}_3}} \right)_4}{\rm{C}}{{\rm{l}}_4}\) in \({{\rm{H}}_2}{\rm{O}}\) shows depression in freezing point by \(0.0054^\circ {\rm{C}}\). The structure of the compound will be (given \({{\rm{K}}_{{\rm{sp}}}}\left( {{{\rm{H}}_2}{\rm{O}}} \right) = 1.860\;{\rm{k}}{{\rm{m}}^{ - 1}}\) )

1 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{4}\)
2 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right] \mathrm{Cl}_{3}\)
3 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}_{2}\)
4 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{3}\right] \mathrm{Cl}\)
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CHXII02:SOLUTIONS

318990 \(0.01 \mathrm{M}\) solutions of \(\mathrm{KCl}\) and \(\mathrm{BaCl}_{2}\) are prepared in water. The freezing point of \(\mathrm{KCl}\) is found to be \(-2{ }^{\circ} \mathrm{C}\). What is the freezing point of \(\mathrm{BaCl}_{2}\) to be completely ionised?

1 \(-3^{\circ} \mathrm{C}\)
2 \(+3^{\circ} \mathrm{C}\)
3 \(-2^{\circ} \mathrm{C}\)
4 \(-4^{\circ} \mathrm{C}\)
AIIMS - 2008
CHXII02:SOLUTIONS

318991 Calculate the number of moles of sodium sulphate required to be dissolved in 12 moles of water to lower its vapour pressure by \(10 \mathrm{mmHg}\) at a \(300 \mathrm{~K}\) temperature (V.P. of \(\mathrm{H}_{2} \mathrm{O}\) at \(300 \mathrm{~K}\) \(=50 \mathrm{mmHg}\) ):

1 2 moles
2 3 moles
3 1 mole
4 1.5 moles
CHXII02:SOLUTIONS

318992 Assuming each salt to be \(90\% \) dissociated which of the following will have highest osmotic pressure

1 Decinormal \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
2 Decinormal \({\rm{BaC}}{{\rm{l}}_{\rm{2}}}\)
3 Decinormal \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
4 A solution obtained by mixing equal volumes of (2) and (3) and filtering
CHXII02:SOLUTIONS

318993 \(1 \times {10^{ - 3}}\;{\rm{m}}\) solution of \({\rm{Pt}}{\left( {{\rm{N}}{{\rm{H}}_3}} \right)_4}{\rm{C}}{{\rm{l}}_4}\) in \({{\rm{H}}_2}{\rm{O}}\) shows depression in freezing point by \(0.0054^\circ {\rm{C}}\). The structure of the compound will be (given \({{\rm{K}}_{{\rm{sp}}}}\left( {{{\rm{H}}_2}{\rm{O}}} \right) = 1.860\;{\rm{k}}{{\rm{m}}^{ - 1}}\) )

1 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{4}\)
2 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right] \mathrm{Cl}_{3}\)
3 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}_{2}\)
4 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{3}\right] \mathrm{Cl}\)
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CHXII02:SOLUTIONS

318990 \(0.01 \mathrm{M}\) solutions of \(\mathrm{KCl}\) and \(\mathrm{BaCl}_{2}\) are prepared in water. The freezing point of \(\mathrm{KCl}\) is found to be \(-2{ }^{\circ} \mathrm{C}\). What is the freezing point of \(\mathrm{BaCl}_{2}\) to be completely ionised?

1 \(-3^{\circ} \mathrm{C}\)
2 \(+3^{\circ} \mathrm{C}\)
3 \(-2^{\circ} \mathrm{C}\)
4 \(-4^{\circ} \mathrm{C}\)
AIIMS - 2008
CHXII02:SOLUTIONS

318991 Calculate the number of moles of sodium sulphate required to be dissolved in 12 moles of water to lower its vapour pressure by \(10 \mathrm{mmHg}\) at a \(300 \mathrm{~K}\) temperature (V.P. of \(\mathrm{H}_{2} \mathrm{O}\) at \(300 \mathrm{~K}\) \(=50 \mathrm{mmHg}\) ):

1 2 moles
2 3 moles
3 1 mole
4 1.5 moles
CHXII02:SOLUTIONS

318992 Assuming each salt to be \(90\% \) dissociated which of the following will have highest osmotic pressure

1 Decinormal \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
2 Decinormal \({\rm{BaC}}{{\rm{l}}_{\rm{2}}}\)
3 Decinormal \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
4 A solution obtained by mixing equal volumes of (2) and (3) and filtering
CHXII02:SOLUTIONS

318993 \(1 \times {10^{ - 3}}\;{\rm{m}}\) solution of \({\rm{Pt}}{\left( {{\rm{N}}{{\rm{H}}_3}} \right)_4}{\rm{C}}{{\rm{l}}_4}\) in \({{\rm{H}}_2}{\rm{O}}\) shows depression in freezing point by \(0.0054^\circ {\rm{C}}\). The structure of the compound will be (given \({{\rm{K}}_{{\rm{sp}}}}\left( {{{\rm{H}}_2}{\rm{O}}} \right) = 1.860\;{\rm{k}}{{\rm{m}}^{ - 1}}\) )

1 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{4}\)
2 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right] \mathrm{Cl}_{3}\)
3 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}_{2}\)
4 \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{3}\right] \mathrm{Cl}\)
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