Abnormal Molar Masses and Van't Hoff Factor
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXII02:SOLUTIONS

319003 One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to \(nA \to {\left[ A \right]_n}\). The Van’t Hoff factor (i) is expressed as (x is degree of association)

1 \({\rm{i = 1 - x}}\)
2 \({\rm{i = 1 + }}\frac{{\rm{x}}}{{\rm{n}}}\)
3 \({\rm{i = }}\frac{{{\rm{1 - x + }}\frac{{\rm{x}}}{{\rm{n}}}}}{{\rm{1}}}\)
4 \({\rm{i = 1}}\)
CHXII02:SOLUTIONS

319004 Statement A :
The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Statement B :
Water is polar and benzene is non-polar.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
CHXII02:SOLUTIONS

319005 Pure benzene freezes at \({\rm{5}}{\rm{.4}}{{\rm{2}}^{\rm{^\circ }}}{\rm{C}}\). A solution of 0.223 g of phenyl acetic acid
\(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{COOH}}} \right)\) in 4.4 g of benzene \(\left( {{{\rm{K}}_{\rm{f}}}{\rm{ = 5}}{\rm{.12K}}{\mkern 1mu} {\mkern 1mu} {\rm{kg/mol}}} \right)\) freezes at \({\rm{4}}{\rm{.4}}{{\rm{7}}^{\rm{^\circ }}}{\rm{C}}\). From this observation, one can conclude that

1 Phenylacetic acid exists as such in benzene
2 Phenylacetic acid undergoes partial ionization in benzene
3 Phenylacetic acid undergoes complete ionization in benzene
4 Phenylacetic acid dimerises in benzene
CHXII02:SOLUTIONS

319006 We have three aqueous solutions of NaCl labelled as \({\mathrm{\mathrm{A}, \mathrm{B}}}\) and C with concentrations \({\mathrm{0.1 \mathrm{M}, 0.01 \mathrm{M}}}\) and 0.001 M respectively. The value of van't Hoff factor (i) for these solutions will be in the order

1 \({\mathrm{i_{A}=i_{B}=i_{C}}}\)
2 \({\mathrm{i_{A} < i_{B} < i_{C}}}\)
3 \({\mathrm{\mathrm{i}_{\mathrm{A}}>\mathrm{i}_{\mathrm{B}}>\mathrm{i}_{\mathrm{C}}}}\)
4 \({\mathrm{\mathrm{i}_{\mathrm{A}} < \mathrm{i}_{\mathrm{C}} < \mathrm{i}_{\mathrm{B}}}}\)
CHXII02:SOLUTIONS

319003 One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to \(nA \to {\left[ A \right]_n}\). The Van’t Hoff factor (i) is expressed as (x is degree of association)

1 \({\rm{i = 1 - x}}\)
2 \({\rm{i = 1 + }}\frac{{\rm{x}}}{{\rm{n}}}\)
3 \({\rm{i = }}\frac{{{\rm{1 - x + }}\frac{{\rm{x}}}{{\rm{n}}}}}{{\rm{1}}}\)
4 \({\rm{i = 1}}\)
CHXII02:SOLUTIONS

319004 Statement A :
The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Statement B :
Water is polar and benzene is non-polar.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
CHXII02:SOLUTIONS

319005 Pure benzene freezes at \({\rm{5}}{\rm{.4}}{{\rm{2}}^{\rm{^\circ }}}{\rm{C}}\). A solution of 0.223 g of phenyl acetic acid
\(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{COOH}}} \right)\) in 4.4 g of benzene \(\left( {{{\rm{K}}_{\rm{f}}}{\rm{ = 5}}{\rm{.12K}}{\mkern 1mu} {\mkern 1mu} {\rm{kg/mol}}} \right)\) freezes at \({\rm{4}}{\rm{.4}}{{\rm{7}}^{\rm{^\circ }}}{\rm{C}}\). From this observation, one can conclude that

1 Phenylacetic acid exists as such in benzene
2 Phenylacetic acid undergoes partial ionization in benzene
3 Phenylacetic acid undergoes complete ionization in benzene
4 Phenylacetic acid dimerises in benzene
CHXII02:SOLUTIONS

319006 We have three aqueous solutions of NaCl labelled as \({\mathrm{\mathrm{A}, \mathrm{B}}}\) and C with concentrations \({\mathrm{0.1 \mathrm{M}, 0.01 \mathrm{M}}}\) and 0.001 M respectively. The value of van't Hoff factor (i) for these solutions will be in the order

1 \({\mathrm{i_{A}=i_{B}=i_{C}}}\)
2 \({\mathrm{i_{A} < i_{B} < i_{C}}}\)
3 \({\mathrm{\mathrm{i}_{\mathrm{A}}>\mathrm{i}_{\mathrm{B}}>\mathrm{i}_{\mathrm{C}}}}\)
4 \({\mathrm{\mathrm{i}_{\mathrm{A}} < \mathrm{i}_{\mathrm{C}} < \mathrm{i}_{\mathrm{B}}}}\)
CHXII02:SOLUTIONS

319003 One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to \(nA \to {\left[ A \right]_n}\). The Van’t Hoff factor (i) is expressed as (x is degree of association)

1 \({\rm{i = 1 - x}}\)
2 \({\rm{i = 1 + }}\frac{{\rm{x}}}{{\rm{n}}}\)
3 \({\rm{i = }}\frac{{{\rm{1 - x + }}\frac{{\rm{x}}}{{\rm{n}}}}}{{\rm{1}}}\)
4 \({\rm{i = 1}}\)
CHXII02:SOLUTIONS

319004 Statement A :
The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Statement B :
Water is polar and benzene is non-polar.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
CHXII02:SOLUTIONS

319005 Pure benzene freezes at \({\rm{5}}{\rm{.4}}{{\rm{2}}^{\rm{^\circ }}}{\rm{C}}\). A solution of 0.223 g of phenyl acetic acid
\(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{COOH}}} \right)\) in 4.4 g of benzene \(\left( {{{\rm{K}}_{\rm{f}}}{\rm{ = 5}}{\rm{.12K}}{\mkern 1mu} {\mkern 1mu} {\rm{kg/mol}}} \right)\) freezes at \({\rm{4}}{\rm{.4}}{{\rm{7}}^{\rm{^\circ }}}{\rm{C}}\). From this observation, one can conclude that

1 Phenylacetic acid exists as such in benzene
2 Phenylacetic acid undergoes partial ionization in benzene
3 Phenylacetic acid undergoes complete ionization in benzene
4 Phenylacetic acid dimerises in benzene
CHXII02:SOLUTIONS

319006 We have three aqueous solutions of NaCl labelled as \({\mathrm{\mathrm{A}, \mathrm{B}}}\) and C with concentrations \({\mathrm{0.1 \mathrm{M}, 0.01 \mathrm{M}}}\) and 0.001 M respectively. The value of van't Hoff factor (i) for these solutions will be in the order

1 \({\mathrm{i_{A}=i_{B}=i_{C}}}\)
2 \({\mathrm{i_{A} < i_{B} < i_{C}}}\)
3 \({\mathrm{\mathrm{i}_{\mathrm{A}}>\mathrm{i}_{\mathrm{B}}>\mathrm{i}_{\mathrm{C}}}}\)
4 \({\mathrm{\mathrm{i}_{\mathrm{A}} < \mathrm{i}_{\mathrm{C}} < \mathrm{i}_{\mathrm{B}}}}\)
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXII02:SOLUTIONS

319003 One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to \(nA \to {\left[ A \right]_n}\). The Van’t Hoff factor (i) is expressed as (x is degree of association)

1 \({\rm{i = 1 - x}}\)
2 \({\rm{i = 1 + }}\frac{{\rm{x}}}{{\rm{n}}}\)
3 \({\rm{i = }}\frac{{{\rm{1 - x + }}\frac{{\rm{x}}}{{\rm{n}}}}}{{\rm{1}}}\)
4 \({\rm{i = 1}}\)
CHXII02:SOLUTIONS

319004 Statement A :
The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Statement B :
Water is polar and benzene is non-polar.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
CHXII02:SOLUTIONS

319005 Pure benzene freezes at \({\rm{5}}{\rm{.4}}{{\rm{2}}^{\rm{^\circ }}}{\rm{C}}\). A solution of 0.223 g of phenyl acetic acid
\(\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{COOH}}} \right)\) in 4.4 g of benzene \(\left( {{{\rm{K}}_{\rm{f}}}{\rm{ = 5}}{\rm{.12K}}{\mkern 1mu} {\mkern 1mu} {\rm{kg/mol}}} \right)\) freezes at \({\rm{4}}{\rm{.4}}{{\rm{7}}^{\rm{^\circ }}}{\rm{C}}\). From this observation, one can conclude that

1 Phenylacetic acid exists as such in benzene
2 Phenylacetic acid undergoes partial ionization in benzene
3 Phenylacetic acid undergoes complete ionization in benzene
4 Phenylacetic acid dimerises in benzene
CHXII02:SOLUTIONS

319006 We have three aqueous solutions of NaCl labelled as \({\mathrm{\mathrm{A}, \mathrm{B}}}\) and C with concentrations \({\mathrm{0.1 \mathrm{M}, 0.01 \mathrm{M}}}\) and 0.001 M respectively. The value of van't Hoff factor (i) for these solutions will be in the order

1 \({\mathrm{i_{A}=i_{B}=i_{C}}}\)
2 \({\mathrm{i_{A} < i_{B} < i_{C}}}\)
3 \({\mathrm{\mathrm{i}_{\mathrm{A}}>\mathrm{i}_{\mathrm{B}}>\mathrm{i}_{\mathrm{C}}}}\)
4 \({\mathrm{\mathrm{i}_{\mathrm{A}} < \mathrm{i}_{\mathrm{C}} < \mathrm{i}_{\mathrm{B}}}}\)