12th Class Chemistry Solutions / विलयन Question Bank

done MCQs - Solutions Total Questions - 15

• question_answer1)
  An ‘'A’' molal solution of a compound in benzene has mole fraction of solute = 0.2. The value of A is
  A)
  1.4 done clear
  B)
  14.0 done clear
  C)
  3.2 done clear
  D)
  2.0 done clear
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• question_answer2)
  What will be the normality of resulting solution in which 5 mL of M HCl, 20 mL of \[\frac{M}{2}\] \[{{H}_{2}}S{{O}_{4}}\] and 30 mL of \[\frac{M}{3}HN{{O}_{3}}\] are mixed together and volume made to 1 L?
  A)
  \[\frac{M}{40}\] done clear
  B)
  \[\frac{M}{10}\] done clear
  C)
  \[\frac{M}{20}\] done clear
  D)
  \[\frac{M}{5}\] done clear
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• question_answer3)
  Which of the following aqueous solutions has the highest concentration of sodium ion?
  A)
  Solution having 15.4 mg \[N{{a}^{+}}/mL\] done clear
  B)
  Solution having 2.07 g NaCl/100 mL done clear
  C)
  \[0.208M\text{ }N{{a}_{2}}S{{O}_{4}}\] done clear
  D)
  All of these have equal concentration of \[N{{a}^{+}}\] done clear
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• question_answer4)
  When bottles A and B have 2 M and 2 m aqueous solutions of sulphuric acid respectively, then
  A)
  A is more concentrated than B done clear
  B)
  B is more concentrated than A done clear
  C)
  The concentration of both A and B are equal done clear
  D)
  It is not possible to compare the concentrations done clear
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• question_answer5)
  The vapour pressure of a liquid in a closed container depends upon
  A)
  surface area of the container done clear
  B)
  amount of liquid done clear
  C)
  temperature done clear
  D)
  None of these done clear
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• question_answer6)
  \[{{H}_{2}}S\] gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol \[k{{g}^{-1}}\]. Thus, Henry's law constant (in atm \[mola{{l}^{-1}}\]) for \[{{H}_{2}}S\] is
  A)
  \[3.826\times {{10}^{3}}\] done clear
  B)
  5.128 done clear
  C)
  \[1.80\times {{10}^{2}}\] done clear
  D)
  \[2.628\times {{10}^{-4}}\] done clear
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• question_answer7)
  A solid dissolves in water when ...... is ...... than hydration energy.
  A)
  lattice energy, more done clear
  B)
  ionisation energy, less done clear
  C)
  lattice energy, less done clear
  D)
  ionisation energy, more done clear
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• question_answer8)
  At higher altitudes the boiling point of water is low because
  A)
  temperature is low done clear
  B)
  atmospheric pressure is low done clear
  C)
  atmospheric pressure is high done clear
  D)
  temperature is high done clear
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• question_answer9)
  When two liquids A and B form an ideal solution, then
  A)
  the Gibbs free energy is zero done clear
  B)
  the entropy of mixing is zero done clear
  C)
  the Gibbs free energy and entropy of mixing both are zero done clear
  D)
  the enthalpy of mixing is zero done clear
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• question_answer10)
  The statement "The partial vapour pressure of each volatile component in the solution is directly proportional to its mole function" is
  A)
  Henry’s law done clear
  B)
  Raoulf’s law done clear
  C)
  Dalton’s law done clear
  D)
  None of these done clear
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• question_answer11)
  What will the value of \[\Delta {{V}_{mix}}\] if a solution of \[CHC{{l}_{3}}\] is mixed with a solution of acetone?
  A)
  \[\Delta {{V}_{mix}}=+ve\] done clear
  B)
  \[\Delta {{V}_{mix}}=-ve\] done clear
  C)
  \[\Delta V=0\] done clear
  D)
  Cannot be predicted done clear
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• question_answer12)
  Identify the substance which exerts lowest vapour pressure.
  A)
  Kerosene done clear
  B)
  Water done clear
  C)
  Mercury done clear
  D)
  Ethanol done clear
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• question_answer13)
  What will be the mole fraction of the solute when the vapour pressure of a dilute aqueous solution of glucose is 750 mm Hg at 373 K?
  A)
  \[\frac{1}{7.6}\] done clear
  B)
  \[\frac{1}{76}\] done clear
  C)
  \[\frac{1}{46}\] done clear
  D)
  \[\frac{1}{38}\] done clear
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• question_answer14)

  Osmosis is involved in processes given below:

  I. Interchange of nutrients and waste products between tissue cells and their surroundings.

  II. Reverse osmosis

  III. Excretion of urine

  IV. Evaporation

  Select the correct processes.

  A)
  I and III done clear
  B)
  I, II and III done clear
  C)
  I, II and IV done clear
  D)
  All of these done clear
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• question_answer15)
  The increasing order of osmotic pressure of equimolar solutions of \[BaC{{I}_{2}},\text{ }NaCI\]and glucose will be
  A)
  \[NaCI>BaC{{I}_{2}}>glucose\] done clear
  B)
  \[Glucose>BaC{{I}_{2}}>NaCI\] done clear
  C)
  \[BaC{{I}_{2}}>NaCI>Glucose\] done clear
  D)
  \[NaCI>Glucose>BaC{{I}_{2}}\] done clear
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