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Topic Question Set

Q 1 :    

Arrange the following compounds in increasing order of their solubilities in chloroform.

NaCl, CH3OH, cyclohexane, CH3CN                                  [2024]

  • NaCl<CH3CN<CH3OH<Cyclohexane

     

  • CH3OH<CH3CN<NaCl<Cyclohexane

     

  • NaCl<CH3OH<CH3CN<Cyclohexane

     

  • Cyclohexane <CH3CN<CH3OH<NaCl

     

(3)

Since, CHCl3 is an organic solvent, covalent (non-polar) compounds will be more soluble in it. As the dipole moment of solute increases, solubility in chloroform decreases. Due to H-bonding, CH3OH will be less soluble than CH3CN. Hence, increasing order of solubility is, NaCl<CH3OH<CH3CN<cyclohexane.
 

 

Q 2 :    

The Henry’s law constant (KH) values of the gases (A, B, C) in water are 145, 2×10-5 and 35 kbar, respectively. The solubility of these gases in water follow the order     [2024]

  • B > A > C

     

  • B > C > A

     

  • A > C > B

     

  • A > B > C

     

(2)

According to Henry’s law, higher the value of KH at a given pressure, lower is the solubility of the gas in the liquid. Thus, solubility order of given gases will be: B > C > A