Chemical Bonding · JEE Main previous year questions

2019 5 questions

1. Q842019 · 12 Apr 2019 · Shift 2

   The C–C bond length is maximum in :

   1. A.${\text{C}}_{60}$
   2. B.diamond
   3. C.graphite
   4. D.${\text{C}}_{70}$
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   Answer: B

2. Q642019 · 10 Apr 2019 · Shift 1

   The isoelectronic set of ions is :

   1. A.${\mathrm{F}}^{-}$, $\mathrm{L}{\mathrm{i}}^{+}$, $\mathrm{N}{\mathrm{a}}^{+}$ and $\mathrm{M}{\mathrm{g}}^{2+}$
   2. B.$\mathrm{L}{\mathrm{i}}^{+}$, $\mathrm{N}{\mathrm{a}}^{+}$, ${\mathrm{O}}^{2-}$ and ${\mathrm{F}}^{-}$
   3. C.${\mathrm{N}}^{3-}$, ${\mathrm{O}}^{2-}$, ${\mathrm{F}}^{-}$ and $\mathrm{N}{\mathrm{a}}^{+}$
   4. D.${\mathrm{N}}^{3-}$, $\mathrm{L}{\mathrm{i}}^{+}$, $\mathrm{M}{\mathrm{g}}^{2+}$ and ${\mathrm{O}}^{2-}$
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   Answer: C

3. Q672019 · 9 Apr 2019 · Shift 2

   Among the following species, the diamagnetic molecule is

   1. A.$\mathrm{CO}$
   2. B.${\mathrm{B}}_2$
   3. C.${\mathrm{O}}_2$
   4. D.$\mathrm{NO}$
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   Answer: A

4. Q642019 · 8 Apr 2019 · Shift 2

   The ion that has $s{p}^3{d}^2$ hybridization for the central atom, is :

   1. A.$[\mathrm{IC}{\mathrm{l}}_2{]}^{-}$
   2. B.$[\mathrm{IC}{\mathrm{l}}_4{]}^{-}$
   3. C.$[\mathrm{I}{\mathrm{F}}_6{]}^{-}$
   4. D.$[\mathrm{Br}{\mathrm{F}}_2{]}^{-}$
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   Answer: B

5. Q742019 · 8 Apr 2019 · Shift 2

   Among the following molecules / ions, ${\mathrm{C}}_2^{2-},{\mathrm{N}}_2^{2-},{\mathrm{O}}_2^{2-},{\mathrm{O}}_2$ which one is diamagnetic and has the shortest bond length?

   1. A.${\mathrm{O}}_2$
   2. B.${\mathrm{C}}_2^{2-}$
   3. C.${\mathrm{N}}_2^{2-}$
   4. D.${\mathrm{O}}_2^{2-}$
   Show answer

   Answer: B