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2002 2 questions

1. Q1562002 · 27 Apr 2002 · Shift 1

   If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :

   1. A.$\Delta H$ is -ve, $\Delta S$ is +ve
   2. B.$\Delta H$ and $\Delta S$ are both +ve
   3. C.$\Delta H$ and $\Delta S$ are both -ve
   4. D.$\Delta H$ is +ve, $\Delta S$ is -ve
   Show answer

   Answer: B

2. Q1742002 · 27 Apr 2002 · Shift 1

   Freezing point of an aqueous solution is $(-0.186{)}^{\circ }\mathrm{C}$. Elevation of boiling point of the same solution is $K_b=0.512{}^{\circ }\mathrm{C}$, $K_f=1.86{}^{\circ }\mathrm{C}$, find the increase in boiling point.

   1. A.$0.186{}^{\circ }\mathrm{C}$
   2. B.$0.0512{}^{\circ }\mathrm{C}$
   3. C.$0.092{}^{\circ }\mathrm{C}$
   4. D.$0.2732{}^{\circ }\mathrm{C}$
   Show answer

   Answer: B