p-Block Elements · JEE Main previous year questions

2006 3 questions

1. Q1072006 · 29 Apr 2006 · Shift 1

   The enthalpy changes for the following processes are listed below : $$\mathrm{C}{\mathrm{l}}_2(\mathrm{g})=2Cl(\mathrm{g}),242.3\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$$ $${\mathrm{I}}_2(\mathrm{g})=2I(\mathrm{g}),151.0\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$$ $$\mathrm{ICl}(\mathrm{g})=\mathrm{I}(\mathrm{g})+\mathrm{Cl}(\mathrm{g}),211.3\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$$ $${\mathrm{I}}_2(\mathrm{s})={\mathrm{I}}_2(\mathrm{g}),62.76\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$$ Given that the standard states for iodine and chlorine are ${\mathrm{I}}_2(\mathrm{s})$ and $\mathrm{C}{\mathrm{l}}_2(\mathrm{g})$, the standard enthalpy of formation for $\mathrm{ICl}(\mathrm{g})$ is :

   1. A.$-14.6\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
   2. B.$-16.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
   3. C.$+16.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
   4. D.$+244.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
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   Answer: C

2. Q1082006 · 29 Apr 2006 · Shift 1

   $(\Delta H-\Delta U)$ for the formation of carbon monoxide (CO) from its elements at $298\mathrm{K}$ is : ($R=8.314\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.$-1238.78\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}$
   2. B.$1238.78\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}$
   3. C.$-2477.57\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}$
   4. D.$2477.57\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}$
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   Answer: B

3. Q1432006 · 29 Apr 2006 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: C