COMEDK UGET 2018 Question Paper (Available): Download Question Paper with Answer Key PDF

COMEDK UGET 2018 Questions

• 1.

  Given that the freezing point of benzene is $ 5.48^\circ C $ and its $ K_f $ value is $ 5.12^\circ C/m $, what would be the freezing point of a solution of 20 g of propane in 400 g of benzene?

  • \( -0.34^\circ C \)
  • \( -0.17^\circ C \)
  • \( -5.8^\circ C \)
  • \( -0.2^\circ C \)
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• 2.

  200 ml of an aqueous solution contains 3.6 g of Glucose and 1.2 g of Urea maintained at a temperature equal to 27$^{\circ}$C. What is the Osmotic pressure of the solution in atmosphere units?
  Given Data R = 0.082 L atm K$^{-1}$ mol$^{-1}$
  Molecular Formula: Glucose = C$_6$H$_{12}$O$_6$, Urea = NH$_2$CONH$_2$

  • 6.24
  • 1.56
  • 9.84
  • 4.92
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• 3.

  An inorganic compound W undergoes the following reactions: $ W + \text{Na}_2\text{CO}_3 \xrightarrow{\text{O}_2 / \text{heat}} X + H^+ \xrightarrow{} Y(s) $ $ Y(aq) + \text{KCl} (aq) \xrightarrow{} Z(s) $ Z appears in the form of orange crystals and is used as an oxidising agent in acid medium. Identify the compound W.

  • \(\text{K}_2\text{Cr}_2\text{O}_4\)
  • \(\text{FeCr}_2\text{O}_4\)
  • \(\text{Cu}(\text{Cr}_2\text{O}_4)_2\)
  • \(\text{Na}_2\text{Cr}_2\text{O}_7\)
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• 4.

  A current of 3.0 A is passed through 750 ml of 0.45 M solution of CuSO₄ for 2 hours with a current efficiency of 90\%. If the volume of the solution is assumed to remain constant, what would be the final molarity of CuSO₄ solution?

  • 0.296
  • 0.4
  • 0.237
  • 0.316
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• 5.

  For a reaction $ 5X + Y \to 3Z $, the rate of formation of Z is $ 2.4 \times 10^{-5} \, \text{mol L}^{-1} \text{s}^{-1} $. Calculate the average rate of disappearance of X.
  

  • \( 4.8 \times 10^{-7} \, \text{mol L}^{-1} \text{s}^{-1} \)
  • \( 13.33 \times 10^{-6} \, \text{mol L}^{-1} \text{s}^{-1} \)
  • \( 4.0 \times 10^{-5} \, \text{mol L}^{-1} \text{s}^{-1} \)
  • \( 12.0 \times 10^{-5} \, \text{mol L}^{-1} \text{s}^{-1} \)
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