Chemical Bonding · JEE Main previous year questions

2020 6 questions

1. Q532020 · 2 Sept 2020 · Shift 1

   If $\mathrm{A}{\mathrm{B}}_4$ molecule is a polar molecule, a possible geometry of $\mathrm{A}{\mathrm{B}}_4$ is

   1. A.Tetrahedral
   2. B.see-saw
   3. C.Square pyramidal
   4. D.Square planar
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   Answer: B

2. Q622020 · 2 Sept 2020 · Shift 2

   The molecular geometry of $\mathrm{S}{\mathrm{F}}_6$ is octahedral. What is the geometry of $\mathrm{S}{\mathrm{F}}_4$ (including lone pair(s) of electrons, if any)?

   1. A.Tetrahedral
   2. B.Trigonal bipyramidal
   3. C.Square planar
   4. D.Pyramidal
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   Answer: B

3. Q572020 · 9 Jan 2020 · Shift 1

   If enthalpy of atomisation for ${\mathrm{Br}}_2(l)$ is x kJ/mol and bond enthalpy for ${\mathrm{Br}}_2$ is y kJ/mol, the relation between them :

   1. A.does not exist
   2. B.is $x<y$
   3. C.is $x>y$
   4. D.is $x=y$
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   Answer: C

4. Q742020 · 7 Jan 2020 · Shift 1· Numerical answer

   Chlorine reacts with hot and concentrated NaOH and produces compounds (X) and (Y). Compound (X) gives white precipitate with silver nitrate solution. The average bond order between Cl and O atoms in (Y) is.

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   Answer: 1.66 to 1.67

5. Q552020 · 7 Jan 2020 · Shift 2

   The bond order and the magnetic characteristics of $\mathrm{C}{\mathrm{N}}^{-}$ are :

   1. A.3, paramagnetic
   2. B.$2\frac{1}{2}$, paramagnetic
   3. C.3, diamagnetic
   4. D.$2\frac{1}{2}$, diamagnetic
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   Answer: C

6. Q742020 · 7 Jan 2020 · Shift 2· Numerical answer

   The number of $\mathrm{s}{\mathrm{p}}^2$ hybridised carbons present in "Aspartame" is

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   Answer: 9