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Q1. Generally those gases are soluble in water to a greater extent which :
  •  Are easily liquefied
  •  Are ionized in water
  •  React with water
  •  All are correct
Solution
These are characteristics which reflect for high solubility of gases in water. It is therefore SO_2 and NH_3 having lower critical temperature or easily liquefied, HCl which ionises in water and CO_2 which reacts with water are more soluble

Q2.If the temperature increase from 0 ͦC to 50 ͦC at atmospheric pressure, which of the following processes is expected to take place more in case of liquids?
  •  Freezing
  •  Vaporization
  •  Sublimation
  •  None of these
Solution
An increase in temperature favours evaporation due to increase in average kinetic energy of molecules.

Q3.  Abnormal colligative properties are observed only when the dissolved non-volatile solute in a given dilute solution
  •   Is a non-electrolyte
  •  Offers an intense colour
  •  Offers no colour
  •  Associates of dissociates
Solution
As the colligative properties depend only upon the number of particles of solute, so if the non-volatile solute dissociate or associates in the solution, the value of colligative properties deviates, i.e., abnormal colligative properties are obtained

Q4. A solute is soluble in two immiscible liquids which are present in a mixture. The concentration of the solute in the upper layer will be :
  •  Same as in the lower layer
  •  Less than in the lower layer
  •  More than in the lower layer
  •  In fixed ratio with that in the lower layer
Solution
K=c_1/c_2

Q5.Distribution law is a special application of ….and vice-versa
  •  Henry’s law
  •  Raoult’s law
  •  Dalton’s law
  •  None of these
Solution
 Henry’s law involves two immiscible phases as gas-liquid; Distribution law involves two immiscible phases as liquid-liquid.

Q6. A solution is prepared by dissolving 24.5 g of sodium hydroxide in distilled water to give 1L solution. The molarity of NaOH in the solution is (Given, that molar mass of NaOH = 40.0 g 〖mol〗^(-1))
  •  1000 g of solution
  •  1 L of solution
  • 1 L of solvent
  •  1000 g of solvent
Solution
Molarity =(moles of solute )/(V of soution in litre ) ∴ Molar solution means 1 mole of solute is present in 1 L of solution.

Q7.In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionisation is 0.3 Taking k_f for water as 1.85, the freezing point of the solution will be nearest to
  •  +0.480℃
  •  -0.260℃
  •  -0.480℃
  •  -0.360℃
Solution



Q8.Volume of 0.6 M NaOH required to neutralise 30 〖cm〗^3 of 0.4 M HCl is
  •  40 〖cm〗^3
  •  20 〖cm〗^3
  •  45 〖cm〗^3
  •  30 〖cm〗^3
Solution

Q9. The vapour pressure (VP) of a dilute solution of non-volatile solute is P and the VP of pure solvent is P_0, the lowering of the VP is :
  •  P_0/P
  •  P/P_0
  •  -ve
  •  +ve
Solution
Lowering is always positive.

Q10. In an osmotic pressure measurement experiment, a 5% solution of compound ‘X’ is found to be isotonic with a 2 % acetic acid solution . The gram molecular mass of ‘X’ is
  •  60
  •  150
  •  300
  • 24
Solution


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