Chemical Bonding · JEE Main previous year questions

2005 6 questions

1. Q1542005 · 28 Apr 2005 · Shift 1

   Of the following sets which one does NOT contain isoelectronic species?

   1. A.${\mathrm{BO}}_3^{3-},{\mathrm{CO}}_3^{2-},{\mathrm{NO}}_3^{-}$
   2. B.${\mathrm{SO}}_3^{2-},{\mathrm{CO}}_3^{2-},{\mathrm{NO}}_3^{-}$
   3. C.${\mathrm{CN}}^{-},{\mathrm{N}}_2,{\mathrm{C}}_2^{2-}$
   4. D.${\mathrm{PO}}_4^{3-},{\mathrm{SO}}_4^{2-},{\mathrm{ClO}}_4^{-}$
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   Answer: B

2. Q1572005 · 28 Apr 2005 · Shift 1

   Lattice energy of an ionic compound depends upon

   1. A.Charge on the ion only
   2. B.Size of the ion only
   3. C.Packing of ions only
   4. D.Charge on the ion and size of the ion
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   Answer: D

3. Q1682005 · 28 Apr 2005 · Shift 1

   Which one of the following species is diamagnetic in nature?

   1. A.$\mathrm{H}{\mathrm{e}}_2^{+}$
   2. B.${\mathrm{H}}_2$
   3. C.${\mathrm{H}}_2^{+}$
   4. D.${\mathrm{H}}_2^{-}$
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   Answer: B

4. Q1912005 · 28 Apr 2005 · Shift 1

   Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (At. No. $\mathrm{Cr}=24,\mathrm{Mn}=25,\mathrm{Fe}=26,\mathrm{Co}=27$)

   1. A.$[\mathrm{Cr}(\mathrm{CN}{)}_6{]}^{-3}$
   2. B.$[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{-3}$
   3. C.$[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{-3}$
   4. D.$[\mathrm{Co}(\mathrm{CN}{)}_6{]}^{-3}$
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   Answer: D

5. Q2082005 · 28 Apr 2005 · Shift 1

   Pick out the isoelectronic structure from the following : $(i)\mathrm{C}{\mathrm{H}}_3^{+}$ $(ii){\mathrm{H}}_3{\mathrm{O}}^{+}$ $(iii)\mathrm{N}{\mathrm{H}}_3$ $(iv)\mathrm{C}{\mathrm{H}}_3^{-}$

   1. A.$(i)$ and $(ii)$
   2. B.$(iii)$ and $(iv)$
   3. C.$(i)$ and $(iii)$
   4. D.$(ii)$, $(iii)$ and $(iv)$
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   Answer: D

6. Q2122005 · 28 Apr 2005 · Shift 1

   Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point :

   1. A.LiCl
   2. B.NaCl
   3. C.KCl
   4. D.RbCl
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   Answer: B