Chemical Bonding · JEE Main previous year questions

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2023 19 questions

Q612023 · 13 Apr 2023 · Shift 1
In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?
1. A. $O_{2} \to O_{2}^{2 -}$
2. B. $N_{2} \to N_{2}^{+}$
3. C. $NO \to NO^{+}$
4. D. $O_{2} \to O_{2}^{+}$
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Answer: C
Q672023 · 13 Apr 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q882023 · 13 Apr 2023 · Shift 1· Numerical answer
$A_{2} + B_{2} \to 2 AB$ . $Δ H_{f}^{0} = - 200 kJ mol^{- 1}$ $AB$ , $A_{2}$ and $B_{2}$ are diatomic molecules. If the bond enthalpies of $A_{2}$ , $B_{2}$ and $AB$ are in the ratio $1 : 0.5 : 1$ , then the bond enthalpy of $A_{2}$ is ___________ $kJ mol^{- 1}$ (Nearest integer)
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Answer: 400
Q682023 · 13 Apr 2023 · Shift 2
Given below are two statements : Statement I : $SO_{2}$ and $H_{2} O$ both possess V-shaped structure. Statement II : The bond angle of $SO_{2}$ is less than that of $H_{2} O$ . In the light of the above statements, choose the most appropriate answer from the options given below:
1. A.Both Statement I and Statement II are incorrect
2. B.Both Statement I and Statement II are correct
3. C.Statement I is correct but Statement II is incorrect
4. D.Statement I is incorrect but Statement II is correct
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Answer: C
Q642023 · 12 Apr 2023 · Shift 1
The bond order and magnetic property of acetylide ion are same as that of
1. A. $O_{2}^{+}$
2. B. $O_{2}^{-}$
3. C. $N_{2}^{+}$
4. D. $N O^{+}$
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Answer: D
Q812023 · 12 Apr 2023 · Shift 1· Numerical answer
In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of $sp^{2}$ hybridised carbons is _________.
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Answer: 10
Q822023 · 11 Apr 2023 · Shift 2· Numerical answer
The maximum number of lone pairs of electrons on the central atom from the following species is _________. $Cl O_{3}^{-}$ , $Xe F_{4}$ , $S F_{4}$ and $I_{3}^{-}$
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Answer: 3
Q742023 · 10 Apr 2023 · Shift 1
The pair from the following pairs having both compounds with net non-zero dipole moment is
1. A.cis-butene, trans-butene
2. B. $CH_{2} Cl_{2}, CHCl_{3}$
3. C.Benzene, anisidine
4. D.1,4-Dichlorobenzene, 1,3-Dichlorobenzene
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Answer: B
Q842023 · 10 Apr 2023 · Shift 1· Numerical answer
The sum of lone pairs present on the central atom of the interhalogen $IF_{5}$ and $IF_{7}$ is _________
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Answer: 1
Q822023 · 10 Apr 2023 · Shift 2· Numerical answer
The number of molecules from the following which contain only two lone pair of electrons is _________ $H_{2} O, N_{2}, CO, XeF_{4}, NH_{3}, NO, CO_{2}, F_{2}$
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Answer: 3
Q812023 · 8 Apr 2023 · Shift 2· Numerical answer
The number of species from the following carrying a single lone pair on central atom Xenon is ____. $Xe F_{5}^{+}$ , $Xe O_{3}$ , $Xe O_{2} F_{2}$ , $Xe F_{5}^{-}$ , $Xe O_{3} F_{2}$ , $XeO F_{4}$ , $Xe F_{4}$
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Answer: 4
Q892023 · 8 Apr 2023 · Shift 2· Numerical answer
The ratio of sigma and $π$ bonds present in pyrophosphoric acid is ____.
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Answer: 6
Q862023 · 6 Apr 2023 · Shift 2· Numerical answer
In an ice crystal, each water molecule is hydrogen bonded to ____________ neighbouring molecules.
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Answer: 4
Q692023 · 30 Jan 2023 · Shift 1
For $OF_{2}$ molecule consider the following : A. Number of lone pairs on oxygen is 2 . B. FOF angle is less than $104. 5^{\circ}$ . C. Oxidation state of O is $- 2$ . D. Molecule is bent 'V' shaped. E. Molecular geometry is linear. correct options are:
1. A.A, C, D only
2. B.A, B, D only
3. C.C, D, E only
4. D.B, E, A only
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Answer: B
Q732023 · 30 Jan 2023 · Shift 1
Match List I with List II | List I (molecules/ions) | List II (No. of lone pairs of $e^{-}$ on central atom) | | :--- | :--- | | A. $IF_{7}$ | I. Three | | B. $ICl_{4}^{-}$ | II. One | | C. $XeF_{6}$ | III. Two | | D. $XeF_{2}$ | IV. Zero | Choose the correct answer from the options given below :
1. A.A - II, B - I, C - IV, D - III
2. B.A - IV, B - I, C - II, D - III
3. C.A - IV, B - III, C - II, D - I
4. D.A - II, B - III, C - IV, D - I
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Answer: C
Q652023 · 29 Jan 2023 · Shift 2
According to MO theory the bond orders for $O_{2}^{2 -}$ , $CO$ and $NO^{+}$ respectively, are
1. A.1, 3 and 3
2. B.2, 3 and 3
3. C.1, 2 and 3
4. D.1, 3 and 2
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Answer: A
Q682023 · 25 Jan 2023 · Shift 2
Statement I : Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre. Statement II : The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Statement I is correct but Statement II is incorrect
2. B.Statement I is incorrect but Statement II is correct
3. C.Both Statement I and Statement II are correct
4. D.Both Statement I and Statement II are incorrect
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Answer: B
Q632023 · 24 Jan 2023 · Shift 1
Decreasing order of the hydrogen bonding in following forms of water is correctly represented by A. Liquid water B. Ice C. Impure water Choose the correct answer from the options given below :
1. A.A = B > C
2. B.B > A > C
3. C.A > B > C
4. D.C > B > A
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Answer: B
Q842023 · 24 Jan 2023 · Shift 2· Numerical answer
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Answer: 2