Other Chemistry · JEE Main previous year questions

2014 6 questions

1. Q672014 · 6 Apr 2014 · Shift 1

   Consider separate solutions of $0.500\mathrm{M}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}(\mathrm{aq})$, $0.100\mathrm{M}\mathrm{M}{\mathrm{g}}_3(\mathrm{P}{\mathrm{O}}_4{)}_2(\mathrm{aq})$, $0.250\mathrm{M}\mathrm{KBr}(\mathrm{aq})$ and $0.125\mathrm{M}\mathrm{N}{\mathrm{a}}_3\mathrm{P}{\mathrm{O}}_4(\mathrm{aq})$ at $25^{\circ }\mathrm{C}$. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

   1. A.$0.125\mathrm{M}\mathrm{N}{\mathrm{a}}_3\mathrm{P}{\mathrm{O}}_4(\mathrm{aq})$ has the highest osmotic pressure.
   2. B.$0.500\mathrm{M}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}(\mathrm{aq})$ has the highest osmotic pressure
   3. C.They all have the same osmotic pressure
   4. D.$0.100\mathrm{M}\mathrm{M}{\mathrm{g}}_3(\mathrm{P}{\mathrm{O}}_4{)}_2(\mathrm{aq})$ has the highest osmotic pressure.
   Show answer

   Answer: C

2. Q722014 · 6 Apr 2014 · Shift 1

   Which one of the following properties is not shown by NO?

   1. A.It combines with oxygen to form nitrogen dioxide
   2. B.It’s bond order is 2.5
   3. C.It is diamagnetic in gaseous state
   4. D.It is a neutral oxide
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   Answer: C

3. Q732014 · 6 Apr 2014 · Shift 1

   The correct statement for the molecule, $\mathrm{Cs}{\mathrm{I}}_3$ is :

   1. A.it contains $\mathrm{C}{\mathrm{s}}^{3+}$ and ${\mathrm{I}}^{-}$ ions.
   2. B.it contains $\mathrm{C}{\mathrm{s}}^{+}$, ${\mathrm{I}}^{-}$ and lattice ${\mathrm{I}}_2$ molecule.
   3. C.it is a covalent molecule
   4. D.it contains $\mathrm{C}{\mathrm{s}}^{+}$ and ${\mathrm{I}}_3^{-}$ ions
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   Answer: D

4. Q762014 · 6 Apr 2014 · Shift 1

   The equation which is balanced and represents the correct product(s) is :

   1. A.$[\mathrm{Mg}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}+(\mathrm{EDTA}{)}^{4-}\stackrel{\mathrm{excess}\mathrm{NaOH}}{\to }[\mathrm{Mg}(\mathrm{EDTA}){]}^{2+}+6{\mathrm{H}}_2\mathrm{O}$
   2. B.$\mathrm{CuS}{\mathrm{O}}_4+\mathrm{KCN}\to {\mathrm{K}}_2[\mathrm{Cu}(\mathrm{CN}{)}_4]+{\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4$
   3. C.$\mathrm{L}{\mathrm{i}}_2\mathrm{O}+2KCl\to 2LiCl+{\mathrm{K}}_2\mathrm{O}$
   4. D.$[\mathrm{CoCl}(\mathrm{N}{\mathrm{H}}_3{)}_5{]}^{+}+5{\mathrm{H}}^{+}\to \mathrm{C}{\mathrm{o}}^{2+}+5N{\mathrm{H}}_4^{+}+\mathrm{C}{\mathrm{l}}^{-}$
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   Answer: D

5. Q822014 · 6 Apr 2014 · Shift 1

   Considering the basic strength of amines in aqueous solution, which one has the smallest $\mathrm{p}{\mathrm{K}}_{\mathrm{b}}$ value?

   1. A.$(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{N}$
   2. B.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}{\mathrm{H}}_2$
   3. C.$(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{NH}$
   4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{N}{\mathrm{H}}_2$
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   Answer: C

6. Q852014 · 6 Apr 2014 · Shift 1
   
   1. A.Only (a)
   2. B.(a) and (b)
   3. C.Only (c)
   4. D.(c) and (d)
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   Answer: D