Solution and Colloids MCQs for MDCAT Practice

Chemistry section, Solution and Colloids chapter. Sample questions from past PMC papers.

1. Question 1
   The solubility of NH4NO3, HgCl2 & AgBr at 20oC in 100 g water is 192 g, 6.5 g & 8.4x10-4 g respectively. It means that among these three solutes:
   • A.HgCl2 has the greatest covalent nature
   • B.AgBr has the greatest covalent nature
   • C.NH4NO3 & AgBr have equal covalent nature
   • D.All have equal covalent nature
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2. Question 2
   Pure water is
   • A.poor conductor
   • B.very good conductor
   • C.slight conductance
   • D.neutral
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3. Question 3
   A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be:
   • A.360
   • B.350
   • C.300
   • D.700
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4. Question 4
   Water molecules surround more around?
   • A.Complex ion
   • B.Simple ion
   • C.Negative ion
   • D.Positive ion
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5. Question 5
   At high altitudes, the boiling point of water decreases because:
   • A.Atmospheric pressure is low
   • B.Temperature is low
   • C.Atmospheric pressure is high
   • D.None of the above
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6. Question 6
   The molal elevation constant of water is 0.51. The boiling point of a 0.1 molal aqueous NaCl solution is nearly:
   • A.100.05C
   • B.100.1C
   • C.100.2C
   • D.101.0C
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7. Question 7
   What is the molality of a solution having 30g of urea in 2000g of water?
   • A.1 molal
   • B.0.75 molal
   • C.0.5 molal
   • D.0.25 molal
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8. Question 8
   The colloids formed by lyophilic molecules are:
   • A.Irreversible
   • B.Stable
   • C.Cannot store
   • D.All of the above
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