Chemical Bonding · JEE Main previous year questions

2018 6 questions

1. Q662018 · 16 Apr 2018 · Shift 1

   In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively :

   1. A.${\text{sp}}^3\text{d}$, trigonal bipyramidal
   2. B.${\text{sp}}^3$, tetrahedral
   3. C.${\text{dsp}}^2$, square planar
   4. D.${\text{d}}^2{\text{sp}}^3$, octahedral
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   Answer: C

2. Q682018 · 16 Apr 2018 · Shift 1

   Which of the following conversions involves change in both shape and hybridisation ?

   1. A.${\text{NH}}_3\to {\text{NH}}_4^{+}$
   2. B.${\text{CH}}_4\to {\text{C}}_2{\text{H}}_6$
   3. C.${\text{H}}_2\text{O}\to {\text{H}}_3{\text{O}}^{+}$
   4. D.${\text{BF}}_3\to {\text{BF}}_4^{-}$
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   Answer: D

3. Q722018 · 15 Apr 2018 · Shift 1

   Identify the pair in which the geometry of the species is T-shape and square - pyramidal, respectively :

   1. A.${\text{ClF}}_3$ and $I{O}_4^{-}$
   2. B.${\text{ICl}}_2^{-}$ and ${\text{ICl}}_5$
   3. C.${\text{XeOF}}_2$ and ${\text{XeOF}}_4$
   4. D.${\text{IO}}_3^{-}$ and ${\text{IO}}_2{\text{F}}_2^{-}$
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   Answer: C

4. Q742018 · 15 Apr 2018 · Shift 1

   The decreasing order of bond angles in ${\text{BF}}_3,{\text{NH}}_3,{\text{PF}}_3$ and ${\text{I}}_3^{-}$ is :

   1. A.${\text{I}}_3^{-}>{\text{NH}}_3>{\text{PF}}_3>{\text{BF}}_3$
   2. B.${\text{I}}_3^{-}>{\text{BF}}_3>{\text{NH}}_3>{\text{PF}}_3$
   3. C.${\text{BF}}_3>{\text{I}}_3^{-}>{\text{PF}}_3>{\text{NH}}_3$
   4. D.${\text{BF}}_3>{\text{NH}}_3>{\text{PF}}_3>{\text{I}}_3^{-}$
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   Answer: B

5. Q772018 · 15 Apr 2018 · Shift 1

   $\text{H}-\text{N}\stackrel{\text{(I)}}{---}\text{N}\stackrel{\text{(II)}}{---}\text{N}$ In hydrogen azide (above) the bond orders of bond (I) and (II) are :

   1. A.(I) < 2, (II) > 2
   2. B.(I) > 2, (II) < 2
   3. C.(I) > 2, (II) > 2
   4. D.(I) < 2, (II) < 2
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   Answer: A

6. Q642018 · 8 Apr 2018 · Shift 1

   Total number of lone pair of electrons in ${\text{I}}_3^{-}$ ion is

   1. A.3
   2. B.9
   3. C.6
   4. D.12
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   Answer: B