JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Topic Test - Solutions Total Questions - 35

• question_answer1)
  The vapour pressure of pure liquid solvent A is atm. When a non-volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. What is the mole fraction of component B in the solution?
  A)
  0.75 done clear
  B)
  0.25 done clear
  C)
  0.40 done clear
  D)
  0.60 done clear
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• question_answer2)
  Which of the following mixture shows positive deviation by ideal behaviour?    
  A)
  \[CHC{{l}_{3}}+{{(C{{H}_{3}})}_{2}}CO\] done clear
  B)
  \[{{C}_{6}}{{H}_{6}}+{{C}_{6}}{{H}_{5}}C{{H}_{3}}\] done clear
  C)
  \[{{H}_{2}}O+HCl\] done clear
  D)
  \[CC{{l}_{4}}+CHC{{l}_{3}}\] done clear
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• question_answer3)
  The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is \[4.5{}^\circ C\]. Calculate the van't Hoff factor, i for this solution.
  A)
  2.50 done clear
  B)
  1.8 done clear
  C)
  1.2 done clear
  D)
  1.3 done clear
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• question_answer4)

  Formation of a solution from two components can be considered as

  (i) Pure solvent \[\to \] separated solvent molecules, \[\Delta {{H}_{1}}\]

  (ii) Pure solute \[\to \] separated solute molecules, \[\Delta {{H}_{2}}\]

  (iii) Separated solvent & solute molecules \[\to \] Solution, \[\Delta {{H}_{3}}\] solution so formed will be ideal if

  A)
  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{3}}-\Delta {{H}_{1}}-\Delta {{H}_{2}}\] done clear
  B)
  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}+\Delta {{H}_{3}}\] done clear
  C)
  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}-\Delta {{H}_{3}}\] done clear
  D)
  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}-\Delta {{H}_{2}}-\Delta {{H}_{3}}\] done clear
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• question_answer5)
  If an equimolar solutions of \[CaC{{l}_{2}}\] and \[AlC{{l}_{3}}\] in water have boiling point of \[{{t}_{1}}\] and \[{{t}_{2}}\] respectively then
  A)
  \[{{t}_{1}}>{{t}_{2}}\] done clear
  B)
  \[{{t}_{2}}+{{t}_{1}}\le 0\] done clear
  C)
  \[{{t}_{1}}={{t}_{2}}\] done clear
  D)
  \[{{t}_{1}}<{{t}_{2}}\] done clear
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• question_answer6)
  A mixture of A and B, which are two miscible liquids, is distilled under equilibrium conditions at atmospheric pressure. The mole fraction of A in solution is 0.3 and in vapour phase is 0.6. If the solution behaves ideally the ratio of \[P\,_{A}^{o}\] to \[P\,_{B}^{o}\] is
  A)
  4.0 done clear
  B)
  2.5                 done clear
  C)
  3.5 done clear
  D)
  1.5 done clear
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• question_answer7)
  A 5% solution of cane sugar (molar mass 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g /mol is
  A)
  136.2 done clear
  B)
  171.2    done clear
  C)
  68.4 done clear
  D)
  34.2 done clear
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• question_answer8)
  The expression relating degree of dissociation of the weak electrolyte \[{{A}_{x}}{{B}_{y}}\] with its van't Hoff factor is
  A)
  \[\alpha =\frac{i-1}{x+y-1}\] done clear
  B)
  \[\alpha =\frac{i+1}{x+y-1}\] done clear
  C)
  \[\alpha =\frac{x+y-1}{i-1}\] done clear
  D)
  \[\alpha =\frac{x+y-1}{i+1}\] done clear
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• question_answer9)
  The partial pressure of \[C{{O}_{2}}\] in air saturated with water vapours at \[25{}^\circ C\] and 1.00 atm is \[3.04\times {{10}^{-4}}\] atm. Henry's constant for \[C{{O}_{2}}\] in water is \[2.3\times {{10}^{-2}}\,\text{mol}\,{{\text{L}}^{-1}}\text{at}{{\text{m}}^{-1}}\] and for carbonic acid \[p{{K}_{a}}\] is 6.37. The pH of normal (\[C{{O}_{2}}\] mixed) rain water will be
  A)
  7.42 done clear
  B)
  6.37 done clear
  C)
  6.99 done clear
  D)
  5.76 done clear
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• question_answer10)
  Normal boiling point of water is 373 K (at 760 mm). Vapor pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mol, the boiling point of water at 23 mm pressure will be:
  A)
  250 K done clear
  B)
  294 K        done clear
  C)
  51.6 K done clear
  D)
  12.5 K done clear
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• question_answer11)

  A compound has the empirical formula\[{{C}_{10}}{{H}_{8}}Fe\]. A solution of 0.26 g of the compound in 11.2 g of benzene \[({{C}_{6}}{{H}_{6}})\] boils at \[\text{8}0.\text{26}{}^\circ \text{C}\]. The boiling point of benzene is \[\text{8}0.\text{1}0{}^\circ \text{C}\] and \[{{K}_{b}}\] is \[\text{2}.\text{53}{}^\circ \text{C}/\text{molal}.\]

  What is the molecular formula of the compound?

  A)
  \[{{C}_{30}}{{H}_{24}}F{{e}_{3}}\] done clear
  B)
  \[{{C}_{10}}{{H}_{8}}Fe\] done clear
  C)
  \[{{C}_{5}}{{H}_{4}}Fe\] done clear
  D)
  \[{{C}_{20}}{{H}_{16}}F{{e}_{2}}\] done clear
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• question_answer12)
  Two components A and B form an ideal solution. The mole fraction of A and B in ideal solutions are \[{{X}_{A}}\] and  \[{{X}_{B}},\] while that of in vapour phase, these components have their mole fractions as \[{{Y}_{A}}\] and \[{{Y}_{B}}\] then, the slope and intercept of plot of \[\frac{1}{{{Y}_{A}}}\] us \[\frac{1}{{{X}_{A}}}\] will be
  A)
  \[\frac{p_{B}^{0}}{p_{A}^{0}},\frac{p_{A}^{0}-p_{B}^{0}}{p_{A}^{0}}\] done clear
  B)
  \[\frac{p_{B}^{0}}{p_{A}^{0}},\frac{p_{A}^{0}+p_{B}^{0}}{p_{A}^{0}}\] done clear
  C)
  \[\frac{p_{A}^{0}}{p_{B}^{0}},\frac{p_{A}^{0}+p_{B}^{0}}{p_{A}^{0}}\] done clear
  D)
  \[\frac{p_{A}^{0}}{p_{B}^{0}},\frac{p_{A}^{0}}{p_{A}^{0}-p_{B}^{0}}\] done clear
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• question_answer13)
  When 2g of non-volatile hydrocarbon containing 94.4 percent carbon is dissolved in 100g benzene, the vapour pressure of Benzene is lowered from 74.66 torr to 74.01 torr. Determine the molecular formula of the hydrocarbon.
  A)
  \[{{C}_{6}}{{H}_{6}}\] done clear
  B)
  \[{{C}_{12}}{{H}_{6}}\] done clear
  C)
  \[{{C}_{7}}{{H}_{8}}\] done clear
  D)
  \[{{C}_{14}}{{H}_{10}}\] done clear
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• question_answer14)
  Find the molality of \[{{H}_{2}}S{{O}_{4}}\] solution whose specific gravity is \[1.98\,g\,m{{l}^{-}}\] and 95% of volume is \[{{H}_{2}}S{{O}_{4}}\].
  A)
  7.412 done clear
  B)
  8.412 done clear
  C)
  9.412 done clear
  D)
  10.412 done clear
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• question_answer15)
  A solution of 0.2 mole \[Kl\]\[(\alpha =100\,%)\] in 1000 g water freezes at \[{{T}_{1}}{{\,}^{0}}C\].  Now to this solution 0.1 mole \[Hg{{I}_{2}}\] is added and the resulting solution freezes at \[{{T}_{2}}{{\,}^{0}}C\]. Which of the following is correct:
  A)
  \[{{T}_{1}}={{T}_{2}}\] done clear
  B)
  \[{{T}_{1}}>{{T}_{2}}\] done clear
  C)
  \[{{T}_{1}}<{{T}_{2}}\]    done clear
  D)
    Nothing can be predict done clear
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• question_answer16)
  Which of the following is true, when components forms an ideal solution?           
  A)
  \[\Delta {{H}_{m}}=\Delta {{V}_{m}}=0\] done clear
  B)
  \[\Delta {{H}_{m}}>\Delta {{V}_{m}}\] done clear
  C)
  \[\Delta {{H}_{m}}<\Delta {{V}_{m}}\]    done clear
  D)
  \[\Delta {{H}_{m}}=\Delta {{V}_{m}}=1\] done clear
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• question_answer17)
  At \[20{}^\circ C\] and 1.00 atm partial pressure of hydrogen, 18 mL of hydrogen, measured at STP, dissolves in 1L of water. If water at \[20{}^\circ C\]is exposed to a gaseous mixture having a total pressure of 1400 Torr (excluding the vapour pressure of water) and containing 68.5% \[{{H}_{2}}\] by volume, find the volume of \[{{H}_{2}},\] measured at STP, which will dissolve in 1L of water.
  A)
  18 mL done clear
  B)
  12 mL done clear
  C)
  23 mL done clear
  D)
  121 mL done clear
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• question_answer18)
  An azeotropic mixture of two liquids boils at a lower temperature than either of them when
  A)
  it is saturated    done clear
  B)
  it does not deviate from Raoult's law done clear
  C)
  it shows negative deviation from Raoult's law done clear
  D)
  it shows positive deviation from Raoult's law done clear
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• question_answer19)
  Equal volume of 0.1 M urea and 0.1 M glucose are mixed. The mixture will have
  A)
  Lower osmotic pressure done clear
  B)
  Same osmotic pressure done clear
  C)
  Higher osmotic pressure done clear
  D)
  None of these done clear
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• question_answer20)
  The vapour pressure of two pure liquids A and B which form an ideal solution are 1000 and 1600 torr respectively at 400 K. A liquid solution of A and B for which the mole fraction of A is 0.60 is contained in a cylinder by a piston on which the pressure can be varied. The solution use slowly vapourised at 400 K by decreasing the applied pressure. What is the composition of last droplet of liquid remaining in equilibrium with vapour?
  A)
  \[{{X}_{A}}=0.30,{{X}_{B}}=0.70\] done clear
  B)
  \[{{X}_{A}}=0.40,{{X}_{B}}=0.60\] done clear
  C)
  \[{{X}_{A}}=0.70,{{X}_{B}}=0.30\] done clear
  D)
  \[{{X}_{A}}=0.50,{{X}_{B}}=0.50\] done clear
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• question_answer21)
  The relative lowering of vapour pressure of aqueous solution containing a non-volatile solute is 0.0125. The molality of the solution is
  A)
  0.70 done clear
  B)
  0.50 done clear
  C)
  0.80 done clear
  D)
  0.40 done clear
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• question_answer22)
  Vapour pressure of \[CC{{l}_{4}}\] at \[{{25}^{o}}C\] is 143 mm of Hg. 0.5 gm of a non-volatile solute (mol. wt. = 65) is dissolved in 100 ml \[CC{{l}_{4}}.\] Find the vapour pressure of the solution (Density of \[CC{{l}_{4}}=1.54\,g.c{{m}^{3}}\])
  A)
  141.93 mm done clear
  B)
  94.39 mm    done clear
  C)
  199.34 mm done clear
  D)
  143.99 mm done clear
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• question_answer23)
  A 0.001 molal solution of \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{4}} \right]\] in water had a freezing point depression of\[0.0054{}^\circ C\]. If \[{{K}_{f}}\] for water is 1.80, the correct formulation for the above molecule is:
  A)
  \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{3}} \right]Cl\]    done clear
  B)
  \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}Cl \right]C{{l}_{2}}\] done clear
  C)
  \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{2}} \right]C{{l}_{3}}\]           done clear
  D)
  \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{4}} \right]\] done clear
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• question_answer24)
  Maximum freezing point will be for 1 molal solution of assuming equal ionization in each case
  A)
  \[[Fe{{({{H}_{2}}O)}_{6}}]C{{l}_{3}}\] done clear
  B)
  \[[Fe{{({{H}_{2}}O)}_{5}}Cl]C{{l}_{2}}.{{H}_{2}}O\] done clear
  C)
  \[[Fe{{({{H}_{2}}O)}_{4}}C{{l}_{2}}]Cl.\,2{{H}_{2}}O\] done clear
  D)
  \[[Fe{{({{H}_{2}}O)}_{3}}C{{l}_{3}}].\,3{{H}_{2}}O\] done clear
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• question_answer25)
  Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is: (\[{{K}_{b}}\] for \[CHC{{l}_{3}}\]= 3.9 kg/mol )
  A)
  79.42 g/mol done clear
  B)
  132.32 g/mol done clear
  C)
  177.42 g/mol done clear
  D)
  242.32 g/mol done clear
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• question_answer26)
  The ratio of \[\Delta {{T}_{f}}\] for \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] solution (assuming complete ionization) to \[\Delta {{T}_{f}}\] for solution of sugar of equal concentration is
  A)
  4 : 1 done clear
  B)
  5 : 2              done clear
  C)
  5 : 1 done clear
  D)
  4 : 15 done clear
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• question_answer27)
  Suppose 5 gm of \[C{{H}_{3}}COOH\] is dissolved in one litre of ethanol. Assume that no reaction between them takes place. Calculate molality of resulting solution if density of ethanol is 0.789 gm/ml.
  A)
  0.0856 done clear
  B)
  0.0956 done clear
  C)
  0.1056 done clear
  D)
  0.1156 done clear
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• question_answer28)
  Match List I with List II and select the correct answer using the code given below the lists:

  List (I)	List (II)
  [A] 50 mL of 3M HCl solution +150 mL of 1 M \[FeC{{l}_{3}}\] solution	(p) 4.17 m
  [B] An aqueous solution of NaCl with mole fraction of NaCl as 0.1	(q) \[[C{{l}^{-}}]=3M\]
  [C] 20% (w/w) propanol \[({{C}_{3}}{{H}_{7}}OH)\] solution	(r) \[[{{H}^{+}}]=2.75M\]
  [D] 10.95% (w/v) HCl solution	(s) 6.1 m

  A)
  A-r, B-s, C-p, D-q                done clear
  B)
  A-q, B-s, C-r, D-q done clear
  C)
  A-q, B-s, C-p, D-q        done clear
  D)
  A-q, B-r, C-p, D-s done clear
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• question_answer29)
  Calculate the weight of non-volatile solute having molecular weight 40, which should be dissolved in 57 g octane to reduce its vapor pressure to 80%:
  A)
  47.2 g done clear
  B)
  5g           done clear
  C)
  106.2g done clear
  D)
  None of these done clear
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• question_answer30)
  The vapour pressure curves of the same solute in the same solvent are shown. The curves are parallel to each other and do not intersect. The concentrations of solutions are in order of:
  A)
  I < II < III done clear
  B)
  I = II = III done clear
  C)
  I > II >III done clear
  D)
  I > III > II done clear
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• question_answer31)
  An aqueous solution containing liquid A \[(M.\,\,Wt.=128)\] 64% by weight has a vapour pressure of 145 mm. Find the vapour pressure of pure A. If that of water is 155 mm at the same temperature.
  A)
  205 mm done clear
  B)
  2.05 mm          done clear
  C)
  1.05 mm done clear
  D)
  105 mm done clear
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• question_answer32)
  The total vapor pressure of a mixture of 1 mol of volatile component A (\[P_{A}^{O}\]= 100 mm Hg) and 3 mol of volatile component B (\[P_{B}^{O}\]=80 mm Hg) is 90 mm Hg. For such case:
  A)
  there is a positive deviation from Raoult's law done clear
  B)
  boiling point has been lowered done clear
  C)
  force of attraction between A and B is smaller than that between A and A or between B and B done clear
  D)
  all the above statements are correct done clear
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• question_answer33)
  The vapour pressure lowering of 0.2 molal urea solution at 40°C is (assuming latent heat of vaporization \[(\Delta H)\] is 10 Kcal/mol.)
  A)
  0.2 torr done clear
  B)
  0.1 torr             done clear
  C)
  0.5 torr done clear
  D)
  0.3 torr done clear
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• question_answer34)
  Osmosis result from
  A)
  Increase in entropy in semi permeable done clear
  B)
  decrease in entropy in less diluted solution done clear
  C)
  decrease in internal energy of less diluted solution done clear
  D)
  decrease in entropy of more diluted solution. done clear
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• question_answer35)
  Concentrated \[HN{{O}_{3}}\] is 63% \[HN{{O}_{3}}\] by mass and has a density of 1.4 g/mL. How many millilitres of this solution are required to prepare 250 mL of a 1.20 M \[HN{{O}_{3}}\] solution?
  A)
  18.0 done clear
  B)
  21.42             done clear
  C)
  20.0 done clear
  D)
  14.21 done clear
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