iCON Education - Chemical Bonding and Molecular Structure

2015 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2015 Cancelled Paper

Which of the following pairs of ions are isoelectronic and isostructural ?

A.

SO₃^2$-$, NO₃^$-$

B.

ClO₃^$-$, SO₃^2$-$

C.

CO₃^2$-$, SO₃^2$-$

D.

ClO₃^$-$, CO₃^2$-$,

Correct Answer: B

Explanation:

Species	Hybridisation	Shape	No. of e^-
$SO_3^{2-}$	sp³	Pyramidal	42
$ClO_3^{-}$	sp³	Pyramidal	42
$CO_3^{2-}$	sp²	Triangular planar	32
$NO_3^{-}$	sp²	Triangular planar	32

2015 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2015 Cancelled Paper

Which of the following options represents the correct bond order ?

A.

O₂^$-$ > O₂ < O₂⁺

B.

O₂^$-$ < O₂ > O₂⁺

C.

O₂^$-$ > O₂ > O₂⁺

D.

O₂^$-$ < O₂ < O₂⁺

Correct Answer: D

Explanation:

$\,$ Bond order $ = {1 \over 2}$ [N_b $-$ N_a]

N_b = No of electrons in bonding molecular orbital

N_a $=$ No of electrons in anti bonding molecular orbital

In O atom 8 electrons present, so in O₂, 8 $ \times $ 2 = 16 electrons present.

Then in $O_2^ + $ no of electrons = 15

in $O_2^ - $ no of electrons = 17

$\therefore\,\,\,\,$ Molecular orbital configuration of O₂ (16 electrons) is

${\sigma _{1{s^2}}}\,\,\sigma _{1{s^2}}^ * \,$ ${\sigma _{2{s^2}}}\,\,\sigma _{2{s^2}}^ * \,$ ${\sigma _{2p_z^2}}\,\,{\pi _{2p_x^2}} = {\pi _{2p_y^2}}\,\,\pi _{2p_x^1}^ * \,\, = \pi _{2p_y^1}^ * $

$\therefore\,\,\,\,$N_a = 6

N_b = 10

$\therefore\,\,\,\,$ BO = ${1 \over 2}\left[ {10 - 6} \right] = 2$

Molecular orbital configuration of O$_2^ + $ (15 electrons) is

${\sigma _{1{s^2}}}\,\sigma _{1{s^2}}^ * \,{\sigma _{2{s^2}}}\,\sigma _{2{s^2}}^ * \,{\sigma _{2p_z^2}}\,{\pi _{2p_x^2}}\, = \,{\pi _{2p_y^2}}\,\pi _{2p_x^1}^ * \, = \,\pi _{2p_y^o}^ * $

$\therefore\,\,\,\,$ N_b = 10

N_a = 5

$\therefore\,\,\,\,$ BO = ${1 \over 2}\left[ {10 - 5} \right]$ = 2.5

Molecular orbital configuration of $O_2^ - $ (17 electrons) is

${\sigma _{1{s^2}}}\,\sigma _{1{s^2}}^ * \,{\sigma _{2{s^2}}}\,\sigma _{2{s^2}}^ * \,{\sigma _{2p_z^2}}\,{\pi _{2p_x^2}}\, = \,{\pi _{2p_y^2}}\,\pi _{2p_x^2}^ * \, = \,\pi _{2p_y^1}^ * $

$\therefore\,\,\,\,$ N_b = 10

N_a = 7

$\therefore\,\,\,\,$ BO = ${1 \over 2}\left[ {10 - 7} \right]$ = 1.5

	$O_2^-$	$O_2$	$O_2^+$
B.O. :	1.5	2.0	2.5

2014 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2014

Which of the following molecules has the maximum dipole moment ?

A.

CO₂

B.

CH₄

C.

NH₃

D.

NF₃

2014 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2014

Which one of the following species has plane triangular shape ?

A.

N₃

B.

NO₃^$-$

C.

NO₂^$-$

D.

CO₂

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013 (Karnataka)

The outer orbitals of C in ethane molecule can be considered to be hybridized to give three equivalent sp² orbitals. The total number of sigma $\left( \sigma \right)$ and pi $\left( \pi \right)$ bonds in ethane molecule is

A.

3 sigma $\left( \sigma \right)$ and 2 pi $\left( \pi \right)$ bonds

B.

4 sigma $\left( \sigma \right)$ and 1 pi $\left( \pi \right)$ bonds

C.

5 sigma $\left( \sigma \right)$ and 1 pi $\left( \pi \right)$ bonds

D.

1 sigma $\left( \sigma \right)$ and 2 pi $\left( \pi \right)$ bonds

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013 (Karnataka)

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic.

A.

O₂ $ \to $ O₂⁺

B.

C₂ $ \to $ C₂⁺

C.

NO $ \to $ NO⁺

D.

N₂ $ \to $ N₂⁺

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013 (Karnataka)

The pair of species that has the same bond order in the following is

A.

CO, NO⁺

B.

NO^$-$, CN^$-$

C.

O₂, N₂

D.

O₂, B₂

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013 (Karnataka)

In which of the following pair both the species have sp³ hybridization ?

A.

SiF₄, BeH₂

B.

NF₃, H₂O

C.

NF₃, BF₃

D.

H₂S, BF₃

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

XeF₂ is isostructural with

A.

SbCl₃

B.

BaCl₂

C.

TeF₂

D.

ICl₂^$-$

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

Dipole-induced dipole interactions are present in which of the following pairs

A.

HCl and He atoms

B.

SiF₄ and He atoms

C.

H₂O and alcohol

D.

Cl₂ and CCl₄

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

Which of the following is electron-deficient ?

A.

(BH₃)₂

B.

PH₃

C.

(CH₃)₂

D.

(SiH₃)₂

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

Which of the following is a polar molecule?

A.

SiF₄

B.

XeF₄

C.

BF₃

D.

SF₄

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

Which of the following is paramagnetic?

A.

CN^$-$

B.

NO⁺

C.

CO

D.

O₂^$-$

2013 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 NEET 2013

Identify the correct order of solubility in aqueous medium.

A.

Na₂S > CuS > ZnS

B.

Na₂S > ZnS > CuS

C.

Cus > ZnS > Na₂S

D.

ZnS > Na₂S > CuS

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Mains

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

A.

$NO < {O_2}^ - < {C_2}^{2 - } < He_2^ + $

B.

${O_2}^ - < NO < {C_2}^{2 - } < He_2^ + $

C.

${C_2}^{2 - } < He_2^ + < {O_2}^ - < NO$

D.

$He_2^ + < {O_2}^ - < NO < {C_2}^{2 - }$

Correct Answer: D

Explanation:

Diatomic species	Bond order
NO	2.5
$O_2^-$	1.5
$C_2^{2-}$	3.0
$He_2^+$	0.5

The increasing order: $He_2^ + < {O_2}^ - < NO < {C_2}^{2 - }$

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Mains

During change of O₂ to O$_2^{ - }$ ion, the electron adds on which one of the following orbitals ?

A.

${\pi ^ * }$ orbital

B.

$\pi $ orbital

C.

${\sigma ^ * }$ orbital

D.

$\sigma $ orbital

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Prelims

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

A.

[BCl₃ and BrCl₃]

B.

[NH₃ and NO$_3^ - $]

C.

[NF₃ and BF₃]

D.

[BF$_4^ - $ and NH$_4^ + $]

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Prelims

Which of the following species contains three bond pairs and one lone pair arround the central atom ?

A.

H₂O

B.

BF₃

C.

NH₂^$-$

D.

PCl₃

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Prelims

The pair of species with the same bond order is

A.

O$_2^{2 - }$, B₂

B.

O$_2^{ + }$, NO⁺

C.

NO, CO

D.

N₂, O₂

2012 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2012 Prelims

Bond order of 1.5 is shown by

A.

O₂⁺

B.

O₂^$-$

C.

O₂2^$-$

D.

O₂

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Mains

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

A.

$O_2^ - ,O_2^{2 - }$ - Both diamagnetic

B.

$O_2^ + ,{O_2}$ - Both paramagnetic

C.

O, $O_{2}^{2-}$ - Both paramagnetic

D.

${O^ + },O_2^{2 - }$ - Both paramagnetic

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Mains

Which of the following structures is the most preferred and hence of lowest energy for SO₃?

A.

AIPMT 2011 Mains Chemistry - Chemical Bonding and Molecular Structure Question 45 English Option 1

B.

AIPMT 2011 Mains Chemistry - Chemical Bonding and Molecular Structure Question 45 English Option 2

C.

AIPMT 2011 Mains Chemistry - Chemical Bonding and Molecular Structure Question 45 English Option 3

D.

AIPMT 2011 Mains Chemistry - Chemical Bonding and Molecular Structure Question 45 English Option 4

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Prelims

Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, NO$_2^ - $. NO$_3^ - $, NH$_2^ - $, NH$_4^ + $, SCN^$-$?

A.

NO$_2^ - $ and NO$_3^ - $

B.

NH$_4^ + $ and NO$_3^ - $

C.

SCN^$-$ and NH$_2^ - $

D.

NO$_2^ - $ and NH$_2^ - $

Correct Answer: A

Explanation:

Ions	Hybridisation
$NO_2^-$	$sp^2$
$NO_3^-$	$sp^2$
$NH_2^-$	$sp^3$
$NH_4^+$	$sp^3$
$SCN^-$	sp

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Prelims

The pairs of species of oxygen and their magnetic behavior are noted below. Which of the following presents the correct description?

A.

O$_2^ - $, O$_2^{2 - }$ - Both diamagnetic

B.

O⁺, O$_2^{2 - }$ - Both paramagnetic

C.

O$_2^{ + }$, O₂ - Both paramagnetic

D.

O, O$_2^{2 - }$ - Both paramagnetic

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Prelims

The correct order of increasing bond length of C $-$ H, C $-$ O, C $-$ C and C$=$C is

A.

C $-$ H < C$=$C < C $-$ O < C $-$ C

B.

C $-$ C < C$=$C < C $-$ O < C $-$ H

C.

C $-$ O < C $-$ H < C $-$ C < C$=$C

D.

C $-$ H < C $-$ O < C $-$ C < C$=$C

2011 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2011 Prelims

Which of the following has the minimum bond length ?

A.

O₂⁺

B.

O₂^$-$

C.

O₂^2$-$

D.

O₂

2010 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2010 Mains

Some of the properties of the two species, $NO_3^ - $ and ${H_3}{O^ + }$ are described below. Which one of them is current?

A.

Dissimilar in hybridization for the central atom with different structures.

B.

Isostructural with same hybridization for the central atom.

C.

Isostructural with different hybridization for the central atom

D.

Similar in hybridization for the central atom with different structures.

2010 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2010 Mains

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

A.

CH₄

B.

SF₄

C.

BF₄^$-$

D.

NH₄⁺

2010 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2010 Prelims

In which of the following pairs of molecules/ ions, the central atoms have sp² hybridisation ?

A.

NO$_2^{ - }$ and NH₃

B.

BF₃ and NO$_2^{ - }$

C.

NH$_2^{ - }$ and H₂O

D.

BF₃ and NH$_2^{ - }$

2010 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2010 Prelims

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 ?

A.

SF₄

B.

I₃^$-$

C.

SbCl₅^2$-$

D.

PCl₅

2010 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2010 Prelims

Which one of the following species does not exist under normal conditions?

A.

Be₂⁺

B.

Be₂

C.

B₂

D.

Li₂

2009 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2009

According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order ?

A.

$N_2^{2 - } < N_2^ - < {N_2}$

B.

${N_2} < N_2^{2 - } < N_2^ - $

C.

$N_2^ - < N_2^{2 - } < {N_2}$

D.

$N_2^ - < {N_2} < N_2^{2 - }$

2009 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2009

In which of the following molecules/ions BF₃, NO$_2^ - $, NH$_2^ - $ and H₂O, the central atom is sp² hybridised?

A.

NH$_2^ - $ and H₂O

B.

NO$_2^ - $ and H₂O

C.

BF₃ and NO$_2^ - $

D.

NO$_2^ - $ and NH$_2^ - $

2009 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2009

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

A.

Dipole-dipole interaction

B.

Covalent bonds

C.

London dispersion force

D.

Hydrogen bonding

2008 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2008

The correct order of increasing bond angles in the following triatomic species is

A.

NO$_2^ + $ < NO₂ < NO$_2^ - $

B.

NO$_2^ + $ < NO$_2^ - $ < NO₂

C.

NO$_2^ - $ < NO$_2^ + $ < NO₂

D.

NO$_2^ - $ < NO₂ < NO$_2^ + $

2008 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2008

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

A.

$NO < {O_2}^ - < {C_2}^{2 - } < He_2^ + $

B.

${O_2}^ - < NO < {C_2}^{2 - } < He_2^ + $

C.

${C_2}^{2 - } < He_2^ + < {O_2}^ - < NO$

D.

$He_2^ + < {O_2}^ - < NO < {C_2}^{2 - }$

2007 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2007

The correct order of C $-$ O bond length among CO, CO${_3^{2 - }}$, CO₂ is

A.

CO < CO${_3^{2 - }}$ < CO₂

B.

CO${_3^{2 - }}$ < CO₂ < CO

C.

CO < CO₂ < CO${_3^{2 - }}$

D.

CO₂ < CO${_3^{2 - }}$ < CO

2007 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2007

In which of the following pairs, the two species are isostructural?

A.

SO${_3^{2 - }}$ and NO${_3^{ - }}$

B.

BF₃ and NF₃

C.

BrO${_3^{ - }}$ and XeO₃

D.

SF₄ and XeF₄

2006 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2006

Which of the following is not a correct statement?

A.

Multiple bonds are always shorter than corresponding single bonds.

B.

The electron-deficient molecules can act as Lewis acids.

C.

The canonical structures have no real existence.

D.

Every AB₅ molecule does in fact have square pyramid structure.

2006 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2006

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

A.

in NH₃ the atomic dipole and bond dipole are in the opposite directions whereas in NF₃ these are in the same direction

B.

in NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction

C.

in NH₃ the atomic dipole and bond dipole are in the same direction whereas in NF₃ these are in opposite directions

D.

in NH₃ as well as in NF₃ the atomic dipole and bond dipole are in opposite directions.

2006 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2006

Which of the following species has a linear shape?

A.

O₃

B.

NO₂^$-$

C.

SO₂

D.

NO₂⁺

2006 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2006

Which of the following is not isostructural with SiCl₄ ?

A.

NH₄^$-$

B.

SCl₄

C.

SO₄^2$-$

D.

PO₄^3$-$

2005 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2005

The correct sequence of increasing covalent character is represented by

A.

LiCl < NaCl < BeCl₂

B.

BeCl₂ < LiCl < NaCl

C.

NaCl < LiCl < BeCl₂

D.

BeCl₂ < NaCl < LiCl

2005 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2005

The correct order in which the O $-$ O bond length increases in the following is

A.

O₂ < H₂O₂ < O₃

B.

O₃ < H₂O₂ < O₂

C.

H₂O₂ < O₂ < O₃

D.

O₂ < O₃ < H₂O₂

2005 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2005

The surface tension of which of the following liquid is maximum ?

A.

C₂H₅OH

B.

CH₃OH

C.

H₂O

D.

C₆H₆

2005 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2005

Which of the following would have a permanent dipole moment?

A.

SiF₄

B.

SF₄

C.

XeF₄

D.

BF₃

2005 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2005

Which of the following molecules has trigonal planar geometry?

A.

BF₃

B.

NH₃

C.

PCl₃

D.

IF₃

2004 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2004

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

A.

lone pair - bond pair repulsion only

B.

bond pair - bond pair repulsion only

C.

lone pair - lone pair repulsion and lone pair - bond pair repulsion

D.

lone pair - lone pair repulsion only.

2004 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2004

H₂O is dipolar, whereas BeF₂ is not. It is because

A.

the electronegativity of F is greater than that of O

B.

H₂O involves hydrogen bonding whereas BeF₂ is a discrete molecule

C.

H₂O is linear and BeF₂ is angular

D.

H₂O is angular and BeF₂ is linear.

2004 NEET MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIPMT 2004

In a regular octahedral molecule, MX₆ the number of X $-$ M $-$ X bonds at 180^o is

A.

three

B.

two

C.

six

D.

four

Chemistry Chapters

Chemical Bonding and Molecular Structure

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