JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Abnormal molecular mass Total Questions - 19

• question_answer1)
  The Van't Hoff factor will be highest for
  A)
                  Sodium chloride   done clear
  B)
                  Magnesium chloride done clear
  C)
                  Sodium phosphate               done clear
  D)
                  Urea done clear
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• question_answer2)
  Which of the following salt has the same value of Van't Hoff factor \[i\] as that of \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] [CBSE PMT 1994; AIIMS 1998]
  A)
              \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]            done clear
  B)
                  \[NaCl\] done clear
  C)
                  \[N{{a}_{2}}S{{O}_{4}}\]                done clear
  D)
                                 \[Al{{(N{{O}_{3}})}_{3}}\] done clear
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• question_answer3)
  When benzoic acid dissolve in benzene, the observed molecular mass is
  A)
                  244         done clear
  B)
                  61 done clear
  C)
                  366 done clear
  D)
                  122 done clear
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• question_answer4)
  The ratio of the value of any colligative property for \[KCl\] solution to that for sugar solution is nearly    [MP PMT 1985]
  A)
                  1              done clear
  B)
                  0.5 done clear
  C)
                  2.0          done clear
  D)
                  3 done clear
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• question_answer5)
  Van't Hoff factor of \[Ca{{(N{{O}_{3}})}_{2}}\] is         [CPMT 1997]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  4 done clear
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• question_answer6)
  Dry air was passed successively through a solution of \[5\,gm\] of a solute in \[80gm\] of water and then through pure water. The loss in weight of solution was \[2.50\,gm\] and that of pure solvent \[0.04\,gm\]. What is the molecular weight of the solute [MP PMT 1986]
  A)
                  70.31 done clear
  B)
                  7.143 done clear
  C)
                  714.3      done clear
  D)
                  80 done clear
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• question_answer7)
  The Van?t Hoff factor calculated from association data is always...than calculated  from dissociation data [JIPMER 2000]
  A)
                  Less        done clear
  B)
                  More done clear
  C)
                  Same      done clear
  D)
                  More or less done clear
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• question_answer8)
  If \[\alpha \] is the degree of dissociation of \[N{{a}_{2}}S{{O}_{4}}\], the Vant Hoff's factor (i) used for calculating the molecular mass is [AIEEE 2005]
  A)
  \[1+\alpha \]          done clear
  B)
  \[1-\alpha \] done clear
  C)
  \[1+2\alpha \]        done clear
  D)
  \[1-2\alpha \] done clear
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• question_answer9)
  Van't Hoff factor \[i\]
  A)
                  \[=\frac{\text{Normal molecular mass}}{\text{Observed molecular mass}}\] done clear
  B)
                  \[=\frac{\text{Observed molecular mass}}{\text{Normal molecular mass}}\] done clear
  C)
                  Less than one in case of dissociation done clear
  D)
                  More than one in case of association done clear
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• question_answer10)
  Which of the following compounds corresponds Van't Hoff factor \['i'\] to be equal to 2 for dilute solution [NCERT 1978]
  A)
                  \[{{K}_{2}}S{{O}_{4}}\]   done clear
  B)
                  \[NaHS{{O}_{4}}\] done clear
  C)
                  Sugar      done clear
  D)
                  \[MgS{{O}_{4}}\] done clear
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• question_answer11)
  The Van't Hoff factor \[i\] for a 0.2 molal aqueous solution of urea is
  A)
                  0.2          done clear
  B)
                  0.1 done clear
  C)
                  1.2          done clear
  D)
              1.0 done clear
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• question_answer12)
  One mole of a solute \[A\] is dissolved in a given volume of a solvent. The association of the solute take place according to \[nA\]⇄\[{{(A)}_{n}}\]. The Van't Hoff factor \[i\]is expressed as [MP PMT 1997]
  A)
                  \[i=1-x\] done clear
  B)
                  \[i=1+\frac{x}{n}\] done clear
  C)
              \[i=\frac{1-x+\frac{x}{n}}{1}\]    done clear
  D)
                  \[i=1\] done clear
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• question_answer13)
  Acetic acid dissolved in benzene shows a molecular weight of                       [MP PET 1993, 02]
  A)
                  60           done clear
  B)
              120 done clear
  C)
                  180         done clear
  D)
                  240 done clear
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• question_answer14)
  The observed osmotic pressure of a solution of benzoic acid in benzene is less than its expected value because [CET Pune 1998]
  A)
                  Benzene is a non-polar solvent done clear
  B)
                  Benzoic acid molecules are associated in benzene done clear
  C)
                  Benzoic acid molecules are dissociated in benzene done clear
  D)
                  Benzoic acid is an organic compound done clear
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• question_answer15)
  The experimental molecular weight of an electrolyte will always be less than its calculated value because the value of Van't Hoff factor ?i? is    [MP PMT 1993]
  A)
                  Less than 1            done clear
  B)
                  Greater than 1 done clear
  C)
                  Equivalent to one  done clear
  D)
                  Zero done clear
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• question_answer16)
  The molecular mass of acetic acid dissolved in water is 60 and when dissolved in benzene it is 120.This difference in behaviour of \[C{{H}_{3}}COOH\] is because       [AMU 2000]
  A)
                  Water prevents association of acetic acid done clear
  B)
                  Acetic acid does not fully dissolve in water done clear
  C)
                  Acetic acid fully dissolves in benzene done clear
  D)
                  Acetic acid does not ionize in benzene done clear
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• question_answer17)
  The correct relationship between the boiling points of very dilute solutions of \[AlC{{l}_{3}}\,({{t}_{1}})\] and \[CaC{{l}_{2}}\,({{t}_{2}})\], having the same molar concentration is             [CPMT 1983]
  A)
                  \[{{t}_{1}}={{t}_{2}}\]     done clear
  B)
                  \[{{t}_{1}}>{{t}_{2}}\] done clear
  C)
                  \[{{t}_{2}}>{{t}_{1}}\]     done clear
  D)
                  \[{{t}_{2}}\ge {{t}_{1}}\] done clear
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• question_answer18)
  The Van't Hoff factor for sodium phosphate would be
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
              4 done clear
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• question_answer19)
  The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to                                    [IIT 1996]
  A)
                  Ionization of benzoic acid done clear
  B)
                  Dimerization of benzoic acid done clear
  C)
                  Trimerization of benzoic acid done clear
  D)
                  Solvation of benzoic acid done clear
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