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31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - NEET MCQ


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30 Questions MCQ Test Chemistry Class 11 - 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 for NEET 2024 is part of Chemistry Class 11 preparation. The 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 below.
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31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 1

The angle between the overlapping of one s-orbital and one p-orbital is [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 1

The overlap between s- and p-orbitals occurs along internuclear axis and hence the angle is 180°.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 2

Equilateral shape has [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 2

Equilateral or triangular planar shape involves sp2 hybridization.

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31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 3

Which of the following molecule does not have a linear arrangement of atoms ? [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 3

For linear arrangement of atoms the hybridisation should be sp(linear shape, 180° angle). Only H2S has sp3-hybridization and hence has angular shape while C2H2, BeH2 and CO2 all involve sp - hybridization and hence have linear arrangement of atoms.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 4

Which of the following does not apply to metallic bond ?[1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 4

In metallic bonds each ion is surrounded by equal no. of oppositely charged ions hence have electrostatic attraction on all sides and hence do not have directional characteristics.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 5

In which one of the following molecules the central atom said to adopt sp2 hybridization?

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 6

H2O has a non zero dipole moment while BeF2 has zero dipole moment because [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 6

BeF2 is linear and hence has zero dipole moment while H2O, being a bent molecule, has a finite or non-zero dipole moment.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 7

Among LiCl, BeCl2 BCl3 and CCl4, the covalent bond character follows the order [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 7

As we move in period from Li → Be → B → C, the electronegativity (EN)  increases and hence the EN difference between the element and Cl decreases and accordingly the covalent character increases Thus option (c) i.e., LiCl < BeCl2 < BCl3< CCl4 is correct.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 8

Which statement is NOT correct ? [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 8

A σ - bond is stronger than a σ -bond hence option (a) is not correct. Sigma (σ) bonds are formed by head on overlap of  unhybridised s–s, p–p or s–p orbitals and hybridised orbitals (sp, sp2, sp3, sp3d and sp3d2) hence σ bonds  are strong bonds. Where as Pi (π)-bonds are formed by side ways overlap of unhybridised p- and d orbitals-hence σ bonds are weak bonds.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 9

Which one shows the strongest hydrogen bonding?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 9

Among the F, O, and N, Fluorine has a higher value of electronegativity, this is the reason that fluorine can form the strongest hydrogen bond with the H atom of another molecule.

Just take an idea from the value of the energy of hydrogen bond that is formed with HF, H2O, and NH3

means to break the hydrogen of one mole HF molecules, 10Kcal energy is required.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 10

Linear combination of two hybridized orbitals belonging to two atoms and each having one electron leads to a [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 10

Linear combination of two hybridized orbitals leads to the formation of sigma bond.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 11

Which one of the following formulae does not correctly represent the bonding capacities of the two atoms involved ? [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 11

The  star marked carbon has a valency of 5 and hence this formula is not correct.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 12

In compound X, all the bond angles are exactly 109°28; X is [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 12

CCl4 has sp3 hybridisation , tetrahedral geometry and all bond angles of 109° 28'.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 13

Which of the following bonds will be most polar?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 13

Polarity of the bond depends upon the electronegativity difference of the two atoms forming the bond. Greater the electronegativity difference, more is the polarity of the bond.

As the electronegativity difference between N and F is maximum hence this bond is most polar.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 14

Which one of the following has the shortest carbon carbon bond length ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 14

The bond length decreases in the order sp3 > sp2 > sp.
Because of the triple bond, the carbon-carbon bond distance in ethyne is shortest.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 15

Which structure is linear ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 15

CO2 has sp-hybridization and is linear. SO2 and CO2-3 are planar (sp2) while SO2-is tetrahedral (sp3).

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 16

Strongest hydrogen bond is shown by [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 16

H – F shows strongest H-bonds.  Linear combination of two hybridized orbitals leads to the formation of sigma bond.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 17

Which of the following statements is not correct ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 17

Sigma bond is stronger than π-bond. The electrons in the π bond are loosely held. The bond is easily broken and is more reactive than σ-bond. Energy released during sigma bond formation is always more than π bond because of greater  extent of overlapping.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 18

Among the following which compound will show the highest lattice energy ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 18

For compounds containing ion s of same charge, lattice energy increases as the size the ions decrease. Thus, NaF has highest lattice energy. The size of cation is in the order Na+ < K+ < Rb+ < Cs+

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 19

Which one of the following is the correct order of interactions ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 19

The strength of the interactions follows the order vander Waal’s < hydrogen – bonding < dipole-dipole < covalent.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 20

Strongest bond is in between [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 20

According to Fajan rules, ionic character increases with increase in size of the cation and decrease in size of the anion. Thus, CsF has higher ionic character than NaCl and hence bond in CsF is stronger than in NaCl.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 21

Mark the incorrect statement in the following [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 21

The removal of an electron from a diatomic molecule may increase the bond order as in the conversion  or decrease the bond order as in the conversion,  As a result, the bond energy may increase or decrease. thus, statement (b) is incorrect.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 22

The weakest among the following types of bonds is[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 22

H-bond is the weakest.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 23

Which of the following does not have a tetrahedral structure ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 23

BH3 has sp2 hybridization and hence does not have tetrahedral structure while all others have tetrahedral structures.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 24

Which of the following pairs will form the most stable ionic bond ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 24

The stability of the ionic bond depends upon the lattice energy which is expected to be more between Mg and F due to +2 charge on Mg atom.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 25

Among the following orbital bonds, the angle is minimum between [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 25

The angle between the bonds formed by px and py orbitals is the minimum i.e. 90°

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 26

Linus Pauling received the Nobel Prize for his work on [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 26

Chemical bonds.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 27

The boiling point of p-nitrophenol is higher than that of o-nitrophenol because [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 27

The b.p. of p-nitrophenol is higher than that of o-nitrophenol because in p-nitrophenol there is intermolecular H-bonding but in onitrophenol it is intramolecular H-bonding.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 28

The distance between the two adjacent carbon atoms is largest in [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 28

The C–C bond distance decreases as the multiplicity of the bond increases. Thus, bond distance decreases in the order: butane (1.54 Å) > benzene (1.39 Å) > ethene (1.34) Å > ethyne (1.20 Å). Thus in butane, C – C bond distance is the largest.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 29

Which of the following species is paramagnetic?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 29

Paramagnetism is caused by the presence of atoms, ions or molecules with unpaired electrons. In NO the presence of unpaired electron is clear. Therefore it is paramagnetic.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 30

The BCl3 is a planar molecule whereas NCl3 is pyramidal because [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 3 - Question 30

As there is no lone pair on boron in BCl3 therefore no repulsion takes place. But there is a lone pair on nitrogen in NCl3. Therefore repulsion takes place. Thus BCl3 is planar molecule but NCl3 is a pyramidal molecule.

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