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Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - JEE MCQ


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30 Questions MCQ Test Chapter-wise Tests for JEE Main & Advanced - Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure

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Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 1

In which of the following species the interatomic bond angle is 109° 28’? [2002]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 1

Both NH3​ and (BF4​)-1 have same hybridisation, sp3, we know in NH3​, there is a lone pair, which makes the bond angle 109°28′. 

(BF4​)-1 and NH3​ has pyramidal structure. So they have same bond angle.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 2

Which of the following are arranged in an increasing order of their bond strengths? [2002]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 2

Bond order = 

Bond order = 

Bond order = (8 – 5) =  1.5

Bond order = (8 –6 ) =  1

NOTE : As we know that as the bond order decreases, stability also decreases and hence the bond strength also decreases. Hence the correct order of their increasing bond strength is

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Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 3

Hybridisation of the underline atom changes in: [2002]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 3

 

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 4

An ether is more volatile than an alcohol having the same molecular formula. This is due to [2003]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 4

There is inter-molecular H binding in alcohols, thus giving them higher boiling point and lower volatility.

Hence C is correct.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 5

Which one of the following pairs of molecules will have permanent dipole moments for both members ? [2003]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 5

Both NO2 and O3 have angular shape and hence will have net dipole moment.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 6

Which one of the following compounds has the smallest bond angle in its molecule ? [2003]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 6

In H2S, due to low electronegativity of sulphur the L.P. - L. P. repulsion is more than B. P. - B. P. repulsion and hence the bond angle is minimum.

                      SO2    H2O   H2S    NH3
Bond angle 119.5° 104.5° 92.5° 106.5°

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 7

The pair of species having identical shapes for molecules of both species is [2003]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 7

Both XeF2 and CO2 have a linear structure.
F — Xe — F O = C = O

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 8

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is [2004]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 8

The order of bond angles

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 9

The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species ? [2004]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 9

Now sin ce bond order of NO+ given (3) is higher than that of NO (2.5). Thus bond length of NO+ will be shorter.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 10

The states of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively [2004]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 10

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 11

Which one of the following has the regular tetr ahedral structure ? [2004]

(Atomic nos. : B = 5, S = 16, Ni =28, Xe = 54)

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 11

 XeF4 (sp3d2 square planar),
[ Ni(CN)4 ]2- (dsp2 square planar ),  
BF4- (sp3 tetrahedral), SF4 (sp3d see saw shaped)

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 12

The maximum number of 90º angles between bond pair-bond pair of electrons is observed in [2004]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 12

  

 

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 13

Lattice energy of an ionic compound depends upon

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 13

The value of lattice energy depends on the charges present on the two ions and the distance between them.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 14

Which of the following molecules/ions does not contain unpaired electrons? [2006]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 14

The distribution of electrons in MOs is as follows :

N2+(electrons 13) 

O2 (electrons 16)

O22– (electrons 18) 

B2 (electrons 10)  

Only O22– does not contain any unpaired electron.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 15

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

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 15

In SF4 the hybr idisation is sp3d and the shape of molecule is

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 16

The decreasing values of bond angles from NH3 (106º) to SbH3 (101º) down group-15 of the periodic table is due to [2006]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 16

The bond angle decreases on moving down the group due to decrease in bond pair-bond pair repulsion.

NOTE : This can also be explained by the fact that as the size of central atom increases sp3 hybrid orbital becomes more distinct with increasing size of central atom i.e. pure p- orbitals are utilized in M–H bonding

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 17

Which of the following species exhibits the diamagnetic behaviour ? [2007]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 17

Diamagnetic species have no unpaired electrons

Whereas paramagnetic species has one or more unpaired electrons as in

   unpaired electrons

unpaired electron

 unpaired electron

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 18

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+? [2007]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 18

Smaller the size and higher the charge more will be polarising power of cation. Since the order of the size of cati on is K+ > Ca++ > Mg ++> Be++ . So the correct order of polarising power is K+ < Ca2+ < Mg2+ < Be2+

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 19

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed? [2007]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 19

(a)N2 : bond order 3, paramagnetic
N2 : bond order, 2.5, paramagnetic
(b) C2 : bond order 2, diamagnetic
C2+ : bond order 1.5, paramagnetic
(c) NO : bond order 2.5, paramagnetic
NO+ : bond order 3, diamagnetic
(d) O2 : bond order 2, paramagnetic
O2+ : bond order 2.5, paramagnetic

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 20

Which of the following hydrogen bonds is the strongest? [2007]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 20

NOTE : Greater the difference between electronegativity of bonded atoms, stronger will be bond. Since F is most electronegative hence F – H ...... F is the strongest bond.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 21

Which one of the following pairs of species have the same bond order? [2008]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 21

For any species to have same bond order we can expect them to have same number of electrons. Calculating the number of electrons in various species.
O2 (8 + 8 +1= 17) ; CN- (6 + 7 +1= 14)
NO+(7 + 8 – 1= 14); CN+ (6 + 7 –1 = 12)
We find CN and NO+ both have 14 electrons so they have same bond order. Correct answer is (a).

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 22

The bond dissociation energy of B – F in BF3 is 646 kJ mol–1 whereas that of  C – F in CF4 is 515 kJ mol–1. The correct reason  for higher B – F bond dissociation energy as compared to that of C – F is [2008]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 22

NOTE : The delocalised pπ -pπ bonding between filled p-orbital of F and vacant p-orbital of B leads to shortening of B–F bond length which results in higher bond dissociation energy of the B–F bond.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 23

Using MO theory, predict which of the following species has the shortest bond length? [2008]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 23

Bond order

Bond order in

Bond order in

Bond order in

Bond order in

Since Bond order

∴  Bond length is shortest in O22+ .

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 24

Among the following the maximum covalent character is shown by the compound [2011]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 24

The proportion of covalent character in an ionic bond is decided by polarisability of the metal cation as well as the electrongativity of both elements involved in bonding. Polarisability is further decided by the density of positive charge on the metal cation. AlCl3 is considered to show maximum covalent character among the given compounds. This is because Al3+ bears 3 unit of positive charge and shows strong tendency to distort the electron cloud, thus the covalent character in Al-Cl bond dramatically increases.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 25

The hybridization of orbitals of N atom in NO3 , NO2+ and NH4+ are respectively : [2011]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 25

The formula to find the hybridisation of central atom is
Z =   [Number of valence electrons on central atom +No. of monovalent  atom altached to it + negative charge if any – positive charge if any]
For NO– Z 

For 

For 

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 26

The structure of IF7 is [2011]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 26

Pentagonal bipyramidal shape.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 27

Ortho-Nitrophenol is less soluble in water than p- and mNitrophenols because : [2012]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 27

Compounds involved in chelation become non-polar.
Consequently such compounds are soluble in nonpolar solvents like ether, benzene etc. and are only sparingly soluble in water whereas meta and para isomers are more soluble in water & less soluble in non-polar solvents.

intra-molecular H-bonding

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 28

In which of the following pairs the two species are not isostructural ? [2012]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 28

PF5 trigonal bipyramidal

BrF5 square pyramidal (distorted)

*Multiple options can be correct
Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 29

Which one of the following molecules is expected to exhibit diamagnetic behaviour ? [JEE M 2013]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 29

The molecular orbital structures of C2 and N2 are

both N2 and C2 have paired electrons in its molecular orbital hence are diamagnetic.

Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 30

Which of the following is the wrong statement ? [JEE M 2013]

Detailed Solution for Test: JEE Main 35 Year PYQs- Chemical Bonding & Molecular Structure - Question 30

(a) 

(b) The central atom is sp2 hybridized with one lone pair.

(c) It is a pale blue gase. At – 249.7°, it forms violet black crystals.

(d) It is diamagnic in nature due to presence of paired electrons.

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