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31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - NEET MCQ


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39 Questions MCQ Test Chemistry Class 11 - 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 for NEET 2024 is part of Chemistry Class 11 preparation. The 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 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 - 1 below.
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31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 1

In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridization is [2004]

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

Only those d or bital s whose  l obes are directed along X, Y and Z directions hybridise with s and p orbitals. In other three d or bitals n amely dxy, dyz and dxz, the lobes are at an angle of 45° from both axis, hence the extent of their overlap with s and p orbitals is much lesser than and orbitals.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 2

In BrF3 molecule, the lone pairs occupy equatorial positions to minimize [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 2

Bent T-shaped geometry in which both lone pairs occupy the equatorial positions of the trigonal bipyramid. Here (lp - lp) repulsion = 0, (lp - bp) repulsion = 4 and (bp - bp) repulsion = 2.

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

Which of the following is the electron deficient molecule? [2005]

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

Molecules containing less than two valence electrons per bond are referred to as electron deficient.

B2H6B2H6 molecule has total 8 covalent bonds but only 12 electrons i.e. 6 pairs. Hence it has 2 electron pairs less than maximum required number for bonding, which makes it electron deficient.

B2H6B2H6 is called diborane. In this compound, the octet for B is incomplete which is why it dimerizes. So B2H6B2H6 is electron deficient.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 4

The correct sequence of increasing covalent character is represented by [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 4

As difference of electronegativity increases % ionic character increases and covalent character decreases i.e., negativity difference decreases covalent character increases.
Further greater the charge on the cation more will be its covalent character. Be has maximum (+2) charge.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 5

Which of the following molecules has trigonal planar geometry? [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 5

Boron trifluoride BF3 molecule has trigonal planar geometry.
The central B atom has 3 bond pairs and 0 lone pairs of electrons. It undergoes sp2 hybridisation.
IF3 has 'T' shaped geometry. PCl3 and NH3 have pyramidal geometry.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 6

Which of the following would have a permanent dipolemoment? [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 6

SF4 has permanent dipole moment.
SF4 has sp3d hybridization and see saw shape (irregular geometry).

Whereas XeF4 shows squre planar geometry SiF4 has tetrahedral shape and BF3 has Trigonal planar shape. All these are symmetric molecules. Hence μ ≠ 0.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 7

Which of the following is not a correct statement?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 7

Statement (a), (c), (d) are correct. Statement (b) is incorrect statement.
AB5 may have two structures as follows :

 

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 8

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 8

Electronic configuration of the molecule according to molecular orbital theory, is

Last two electrons are unpaired. So no. of unpaired electron is 2.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 9

In which of the following molecules all the bonds are not equal? [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 9

In BF3, AlF3 & NF3 all fluoride atoms are symmetrically oriented with respect to central metal atom but in ClF3 three fluorine atoms are arranged as follows :

Here two bonds are in equitorial plane & one bond is in axial plane.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 10

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2D). This is because [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 10

In NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite direction so in the former case they are added up whereas in the latter case net result is reduction of dipole moment. It has been shown in the following figure :

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 11

Which of the following species has a linear shape ?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 11

NO2+ will have linear shape as it will have sp hybridisation.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 12

Which of the following is not isostructural with SiCl4?[2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 12

In SiCl4 there is sp3 hybridisation so the structure is tetrahedral. In SO42–, PO43–, NH4+ the structure is tetrahedral because in all hybridisation is sp3. But in SCl4, sp3d hybridisation present so shape is different which is see saw.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 13

In which of the following pairs, the two species are iso-structure?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 13

Hybridization of Br is BrO3
Total valence elctrons = 7 + 3 × 6 = 25
Charge = –1 hence
Total = 25 + 1 = 26

hybridization = dsp3 hybridization of Xe in XeO3 Total valence electrons

Hybridization = dsp3 In both cases, the structure is trigonal pyramidal.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 14

The correct order of C–O bond length among CO, CO32- , CO2 is [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 14

All these structures exhibits resonance and can be represented by the following resonating structures.

(i) 

(ii) 

(iii)

More is the single bond character. More will be the bond length. Hence, the corret order is :

CO < CO2 < CO3– –

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 15

The angular shape of ozone molecule (O3) consists of : [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 15

Single bond contains = 1 σ bond
Double bond contains = 1 σ bond + 1 π bond
Triple bond contains = 1σ  bond + 2 π bond

The molecule of O3 is bent with an angle of 116.8o and equal O-O distance of 128 pm. The ozone molecule consists of 2 sigma bond and 1 pi bond.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 16

The correct order of increasing bond angles in the following triatomic species is : [2008]  

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 16

From the structure of three species we can determine the number of lone pair electrons on central atom (i.e. N atom) and thus the bond angle.

We know that higher the number of lone pair of electron on central atom, greater is the lp – lp repulsion between Nitrogen and oxygen atoms. Thus smaller is bond angle..
The correct order of bond angle is

NO2- <NO2<NO2 i .e. opti on (b) is correct.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 17

Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order ? [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 17

Calculating the bond order of various species.

From these values we find the correct order of increasing bond order is

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 18

What is the dominant intermolecular force or bond that must be overcome in converting liquid CH3OH to a gas? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 18

Due to intermolecular hydrogen bonding in methanol, it exist as assosiated molecule.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 19

In which of the following molecules / ions BF3, NO2-, NH2- and H2O , [2009] the central atom is sp2 hybridized ?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 19

For neutral molecules: No. of electron pairs = No. of atoms bonded
to it + [Group number of central atom –Valency of the central atom].
For ions : No. of electron pairs = No. of atoms bonded
to it +[Group no. of central atom – valency of the central atom ± no. of electrons] On calcuting no. of electron pairs in given molecules. We find that in the given molecules hybridisation is

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 20

In which of the following pairs of molecules/ ions, the central atoms have sp2 hybridization? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 20

  3 means sp2

3 means sp2

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 21

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three?

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 21

  6 means sp3d2

I3 , SF4 , and PCl5 ; all have sp3d hybridization.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 22

Some of the properties of the two species, NO3- and H3O+ are described below. Which one of them is correct? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 22

In NO3-2 , nitrogen is in sp2 hybridisation, thus planar in shape. In H3O+ , oxygen is in sp3 hybridisation, thus tetrahedral in shape.
∴ Correct choice : (b)

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 23

In which of the following molecules the central atom does not have sp3 hybridization? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 23

(a) NH+4  : sp3 hybridisation
(b) CH4: sp3 hybridisation
(c) SF4: sp3 d hybridisation
(d) BF4 : sp3 hybridisation
∴ Correct choice : (c)

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 24

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 24

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 25

Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, NO2, NO3, NH2, NH4+, SCN ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 25

Hybridisation =  [No. of valenceelectrons of central atom + no. of monovalent atoms attached to it – Negative charge if any – positive charge if any]

SCN  = sp i.e., NO2and NO3 have same hybridisation.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 26

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 26

BF4- hybridisation sp3, tetrahedral  structure.
NH4+ hybridisation sp3, tetrahedral structure.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 27

Bond order of 1.5 is shown by : [2012]  

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 27

(O2) =

Bond order

Bond order 

Bond order

Bond order 

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 28

Which of the following species contains three bond pairs and one lone pair around the central atom ?[2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 28

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 29

The pair of species with the same bond order is : [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 29

Both O22– and B2 has bond order equal to 1.

Bondorder = 

B2 is known in the gas phase

Bond order  = 

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 30

During change of O2 to O2- ion, the electron adds on which one of the following orbitals ? [2012 M] 

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 30

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 31

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them: [2012 M]

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

Bond order  = 

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 32

Which of the following is electron - deficient ? [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 32

It contains two 3 centre - 2 electron bonds and present above and below the plane of molecules compounds which do not have sufficient number of electrons to form normal covalent bonds are called electron deficient molecules.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 33

Which one of the following molecules contains no pi -bond?

[NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 33

All the molecules have O atom with lone pairs, but in H2O the H atom has no vacant orbital for pi-bonding. That's why it does not have any pi- bond.
 
In all other given molecules, the central atom because of the presence of vacant orbitals is capable to farm Pi- bonds.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 34

Which of the following is paramagnetic ? [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 34

Molecular orbital configuration of O2- is

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 35

XeF2 is isostructural with : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 35

           sp3d and Linear

            sp3d and Linear

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 36

In which of the following pair both the species have sp3 hybridization? [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 36

Applying VSEPR theory, both NF3 and H2O are sp3 hybridized.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 37

The pair of species that has the same bond order in the following is: [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 37

No. of electrons in CO = 6 + 8 = 14 No. of electrons in NO+ = 7 + 8 – 1 = 14
∴ CO and NO+ are isoelectronic species.
Isoelectronic species have identical bond order.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 38

In which of the following ionisation processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic? [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 38

A) Going from N2 to N2+, bond order decreases from 3 to 2.5
B) Going from O2 to O2+, bond order increases from 2 to 2.5, but magnetic behavior does not change. Both of these species are paramagnetic.
C) Going from C2 to C2+, bond order decreases from 2 to 1.5.
D) Going from NO to NO+, bond order increases from 2.5 to 3, and the magnetic behavior changes from paramagnetic to diamagnetic.
So, option d is correct.

31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 39

The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp2 orbitals. The total number of sigma (σ) and pi (π) bonds in ethene molecule is [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Chemical Bonding & Molecular Structure - 1 - Question 39

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