Chemical Bonding · JEE Main previous year questions

2024 28 questions

1. Q702024 · 9 Apr 2024 · Shift 1

   In which one of the following pairs the central atoms exhibit ${\text{sp}}^2$ hybridization ?

   1. A.$\mathrm{B}{\mathrm{F}}_3$ and $\mathrm{N}{\mathrm{O}}_2^{-}$
   2. B.$\mathrm{N}{\mathrm{H}}_2^{-}$ and $\mathrm{B}{\mathrm{F}}_3$
   3. C.$\mathrm{N}{\mathrm{H}}_2^{-}$ and ${\mathrm{H}}_2\mathrm{O}$
   4. D.${\mathrm{H}}_2\mathrm{O}$ and $\mathrm{N}{\mathrm{O}}_2$
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   Answer: A

2. Q622024 · 9 Apr 2024 · Shift 2
   
   1. A.$\mathrm{II}>\mathrm{III}>\mathrm{I}$
   2. B.$\mathrm{II}>\mathrm{I}>\mathrm{III}$
   3. C.$\mathrm{III}>\mathrm{II}>\mathrm{I}$
   4. D.$\mathrm{I}>\mathrm{II}>\mathrm{III}$
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   Answer: C

3. Q732024 · 9 Apr 2024 · Shift 2

   The correct increasing order for bond angles among $\mathrm{B}{\mathrm{F}}_3$, $\mathrm{P}{\mathrm{F}}_3$ and $\mathrm{Cl}{\mathrm{F}}_3$ is :

   1. A.$\mathrm{B}{\mathrm{F}}_3=\mathrm{P}{\mathrm{F}}_3<\mathrm{Cl}{\mathrm{F}}_3$
   2. B.$\mathrm{B}{\mathrm{F}}_3<\mathrm{P}{\mathrm{F}}_3<\mathrm{Cl}{\mathrm{F}}_3$
   3. C.$\mathrm{Cl}{\mathrm{F}}_3<\mathrm{P}{\mathrm{F}}_3<\mathrm{B}{\mathrm{F}}_3$
   4. D.$\mathrm{P}{\mathrm{F}}_3<\mathrm{B}{\mathrm{F}}_3<\mathrm{Cl}{\mathrm{F}}_3$
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   Answer: C

4. Q662024 · 8 Apr 2024 · Shift 2

   The shape of carbocation is :

   1. A.tetrahedral
   2. B.diagonal pyramidal
   3. C.diagonal
   4. D.trigonal planar
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   Answer: D

5. Q902024 · 8 Apr 2024 · Shift 2· Numerical answer

   Number of molecules having bond order 2 from the following molecules is ______. ${\mathrm{C}}_2,{\mathrm{O}}_2,\mathrm{B}{\mathrm{e}}_2,\mathrm{L}{\mathrm{i}}_2,\mathrm{N}{\mathrm{e}}_2,{\mathrm{N}}_2,\mathrm{H}{\mathrm{e}}_2$

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   Answer: 2

6. Q702024 · 6 Apr 2024 · Shift 2

   Given below are two statements : Statement I : ${\text{PF}}_5$ and ${\text{BrF}}_5$ both exhibit ${\text{sp}}^3\text{ d}$ hybridisation. Statement II : Both ${\text{SF}}_6$ and $[\text{Co}({\text{NH}}_3{)}_6{]}^{3+}$ exhibit ${\text{sp}}^3{\text{ d}}^2$ hybridisation. In the light of the above statements, choose the correct answer from the options given below :

   1. A.Both Statement I and Statement II are false
   2. B.Statement I is true but Statement II is false
   3. C.Statement I is false but Statement II is true
   4. D.Both Statement I and Statement II are true
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   Answer: A

7. Q812024 · 6 Apr 2024 · Shift 2· Numerical answer

   Consider the following reactions $\text{NiS}+{\text{HNO}}_3+\text{HCl}\to \text{A}+\text{NO}+\text{S}+{\text{H}}_2\text{O}$ $\text{A}+{\text{NH}}_4\text{OH}+\begin{array}{c}{\text{H}}_3\text{C}-\text{C}=\text{N}-\text{OH}\\ |\\ {\text{H}}_3\text{C}-\text{C}=\text{N}-\text{OH}\end{array}\to \text{B}+{\text{NH}}_4\text{Cl}+{\text{H}}_2\text{O}$ The number of protons that do not involve in hydrogen bonding in the product B is ________.

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   Answer: 12

8. Q902024 · 5 Apr 2024 · Shift 2· Numerical answer

   Number of compounds from the following with zero dipole moment is ____. $\mathrm{HF},{\mathrm{H}}_2,{\mathrm{H}}_2\mathrm{S},\mathrm{C}{\mathrm{O}}_2,\mathrm{N}{\mathrm{H}}_3,\mathrm{B}{\mathrm{F}}_3,\mathrm{C}{\mathrm{H}}_4,\mathrm{CHC}{\mathrm{l}}_3,\mathrm{Si}{\mathrm{F}}_4,{\mathrm{H}}_2\mathrm{O},\mathrm{Be}{\mathrm{F}}_2$

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   Answer: 6

9. Q712024 · 4 Apr 2024 · Shift 1

   Number of molecules/ions from the following in which the central atom is involved in $\mathrm{s}{\mathrm{p}}^3$ hybridization is ____. $\mathrm{N}{\mathrm{O}}_3^{-},\mathrm{BC}{\mathrm{l}}_3,\mathrm{Cl}{\mathrm{O}}_2^{-},\mathrm{Cl}{\mathrm{O}}_3^{-}$

   1. A.2
   2. B.4
   3. C.1
   4. D.3
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   Answer: A

10. Q782024 · 4 Apr 2024 · Shift 1

    Which one of the following molecules has maximum dipole moment?

    1. A.${\mathrm{CH}}_4$
    2. B.${\mathrm{NF}}_3$
    3. C.${\mathrm{NH}}_3$
    4. D.${\mathrm{PF}}_5$
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    Answer: C

11. Q712024 · 4 Apr 2024 · Shift 2

    The correct statement/s about Hydrogen bonding is/are A. Hydrogen bonding exists when H is covalently bonded to the highly electronegative atom. B. Intermolecular H bonding is present in $o$-nitro phenol C. Intramolecular H bonding is present in HF. D. The magnitude of H bonding depends on the physical state of the compound. E. H-bonding has powerful effect on the structure and properties of compounds Choose the correct answer from the options given below:

    1. A.A, B, C only
    2. B.A only
    3. C.A, D, E only
    4. D.A, B, D only
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    Answer: C

12. Q822024 · 4 Apr 2024 · Shift 2· Numerical answer

    Number of compounds / species from the following with non-zero dipole moment is _________. ${\text{BeCl}}_2,{\text{BCl}}_3,{\text{NF}}_3,{\text{XeF}}_4,{\text{CCl}}_4,{\text{H}}_2\text{O},{\text{H}}_2\text{S},\text{HBr},{\text{CO}}_2,{\text{H}}_2,\text{HCl}$

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    Answer: 5

13. Q832024 · 4 Apr 2024 · Shift 2· Numerical answer

    The total number of 'sigma' and 'pi' bonds in 2-oxohex-4-ynoic acid is ______.

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    Answer: 18

14. Q672024 · 1 Feb 2024 · Shift 1

    In case of isoelectronic species the size of ${\mathrm{F}}^{-},\mathrm{Ne}$ and $\mathrm{N}{\mathrm{a}}^{+}$ is affected by :

    1. A.Nuclear charge $(\mathrm{z})$
    2. B.None of the factors because their size is the same
    3. C.Electron-electron interaction in the outer orbitals
    4. D.Principal quantum number (n)
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    Answer: A

15. Q802024 · 1 Feb 2024 · Shift 1

    Arrange the bonds in order of increasing ionic character in the molecules. $\mathrm{LiF},{\mathrm{K}}_2\mathrm{O},{\mathrm{N}}_2,\mathrm{S}{\mathrm{O}}_2$ and $\mathrm{Cl}{\mathrm{F}}_3$ :

    1. A.${\mathrm{N}}_2<\mathrm{S}{\mathrm{O}}_2<\mathrm{Cl}{\mathrm{F}}_3<{\mathrm{K}}_2\mathrm{O}<\mathrm{LiF}$
    2. B.$\mathrm{Cl}{\mathrm{F}}_3<{\mathrm{N}}_2<\mathrm{S}{\mathrm{O}}_2<{\mathrm{K}}_2\mathrm{O}<\mathrm{LiF}$
    3. C.$\mathrm{LiF}<{\mathrm{K}}_2\mathrm{O}<\mathrm{Cl}{\mathrm{F}}_3<\mathrm{S}{\mathrm{O}}_2<{\mathrm{N}}_2$
    4. D.${\mathrm{N}}_2<\mathrm{Cl}{\mathrm{F}}_3<\mathrm{S}{\mathrm{O}}_2<{\mathrm{K}}_2\mathrm{O}<\mathrm{LiF}$
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    Answer: A

16. Q802024 · 1 Feb 2024 · Shift 2
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: A

17. Q822024 · 31 Jan 2024 · Shift 2· Numerical answer

    A diatomic molecule has a dipole moment of $1.2\mathrm{D}$. If the bond distance is $1{\mathrm{A}}^{\circ }$, then fractional charge on each atom is ____ $\times 10^{-1}$ esu. (Given $1\mathrm{D}=10^{-18}$ esucm)

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    Answer: 0

18. Q752024 · 30 Jan 2024 · Shift 1

    Diamagnetic Lanthanoid ions are :

    1. A.$\mathrm{L}{\mathrm{a}}^{3+}\&\mathrm{C}{\mathrm{e}}^{4+}$
    2. B.$\mathrm{N}{\mathrm{d}}^{3+}\&\mathrm{C}{\mathrm{e}}^{4+}$
    3. C.$\mathrm{L}{\mathrm{u}}^{3+}\&\mathrm{E}{\mathrm{u}}^{3+}$
    4. D.$\mathrm{N}{\mathrm{d}}^{3+}\&\mathrm{E}{\mathrm{u}}^{3+}$
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    Answer: A

19. Q782024 · 30 Jan 2024 · Shift 1

    Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : $\mathrm{C}{\mathrm{H}}_2=\mathrm{CH}-\mathrm{C}{\mathrm{H}}_2-\mathrm{Cl}$ is an example of allyl halide. Reason (R) : Allyl halides are the compounds in which the halogen atom is attached to $\mathrm{s}{\mathrm{p}}^2$ hybridised carbon atom. In the light of the above statements, choose the most appropriate answer from the options given below :

    1. A.(A) is true but (R) is false
    2. B.(A) is false but (R) is true
    3. C.Both (A) and (R) are true but (R) is not the correct explanation of (A)
    4. D.Both (A) and (R) are true and (R) is the correct explanation of (A)
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    Answer: A

20. Q712024 · 29 Jan 2024 · Shift 1

    The difference in energy between the actual structure and the lowest energy resonance structure for a given compound is

    1. A.electromeric energy
    2. B.resonance energy
    3. C.ionization energy
    4. D.hyperconjugation energy
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    Answer: B

21. Q752024 · 29 Jan 2024 · Shift 1

    The interaction between $\pi$ bond and lone pair of electrons present on an adjacent atom is responsible for

    1. A.Resonance effect
    2. B.Electromeric effect
    3. C.Hyperconjugation
    4. D.Inductive effect
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    Answer: A

22. Q852024 · 29 Jan 2024 · Shift 1· Numerical answer

    The number of species from the following which are paramagnetic and with bond order equal to one is _________. ${\mathrm{H}}_2,\mathrm{H}{\mathrm{e}}_2^{+},{\mathrm{O}}_2^{+},{\mathrm{N}}_2^{2-},{\mathrm{O}}_2^{2-},{\mathrm{F}}_2,\mathrm{N}{\mathrm{e}}_2^{+},{\mathrm{B}}_2$

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    Answer: 1

23. Q882024 · 29 Jan 2024 · Shift 1· Numerical answer

    Number of compounds with one lone pair of electrons on central atom amongst following is _________. ${\mathrm{O}}_3,{\mathrm{H}}_2\mathrm{O},\mathrm{S}{\mathrm{F}}_4,\mathrm{Cl}{\mathrm{F}}_3,\mathrm{N}{\mathrm{H}}_3,\mathrm{Br}{\mathrm{F}}_5,\mathrm{Xe}{\mathrm{F}}_4$

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    Answer: 4

24. Q682024 · 29 Jan 2024 · Shift 2

    Which of the following statements are correct about $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ ? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and $+\mathrm{II}$. C. Compounds of $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature. D. $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals. Choose the most appropriate from the options given below:

    1. A.C, D only
    2. B.B, C only
    3. C.A, D only
    4. D.B, D only
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    Answer: D

25. Q812024 · 29 Jan 2024 · Shift 2· Numerical answer

    The total number of molecules with zero dipole moment among $\mathrm{C}{\mathrm{H}}_4,\mathrm{B}{\mathrm{F}}_3,{\mathrm{H}}_2\mathrm{O},\mathrm{HF},\mathrm{N}{\mathrm{H}}_3,\mathrm{C}{\mathrm{O}}_2$ and $\mathrm{S}{\mathrm{O}}_2$ is _________.

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    Answer: 3