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Test: Dipole Moment


19 Questions MCQ Test Chemistry for JEE | Test: Dipole Moment


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This mock test of Test: Dipole Moment for JEE helps you for every JEE entrance exam. This contains 19 Multiple Choice Questions for JEE Test: Dipole Moment (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Dipole Moment quiz give you a good mix of easy questions and tough questions. JEE students definitely take this Test: Dipole Moment exercise for a better result in the exam. You can find other Test: Dipole Moment extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Number of π bonds in the following structure is–

Solution:

In a given structure there are 4 -pi bonds.Hence, total number of pi electrons are 8.

QUESTION: 2

Correct decreasing order of dipole moment of CH3F, CH3CI and CH3Br is

Solution:




Bond length and (EN) oppose each other, with the larger halogens having longer bonds but weaker (EN). Thus CH3CI > CH3F > CH3Br.

QUESTION: 3

Consider the following compounds

Q. Increasing order of dipole moment of these compounds is 

Solution:



Toluene with one —CH3 is less polar then m - and o-dichlorobenzene. Thus, IV < l < III < II.

QUESTION: 4

Dipole moment of   is 1.5 D. Thus, dipole moment 
Solution:

 If one considers following molecule, it is 


Symmetrical and thus
In the given species

QUESTION: 5

Given for HCI and HI 

Q. Ratio of fraction of electric charge existing on each atom in HCI and HI is
Solution:



QUESTION: 6

Ortho-isomers have dipole moments. In which cases dipole moments are maximum and minimum?
Solution:




Larger the value of θ, smaller the value of μ. Dipole-dipole repulsion (due to large groups (as Cl, Cl) increases , thus decreases p.
Intramolecular H-bonding (as OH and NO2) decreases θ, thus increases μ.

Repulsion
(Cl—Cl) > (OH—OH) > (CH3—CH3)
Thus, μ is minimum when X = V = Cl and μ is maximum when X = OH
Y = NO2

QUESTION: 7

Which of the following is nonpolar but contains polar bonds?
Solution:

Carbon dioxide CO2 has polar bonds but is a nonpolar molecule. The structure of CO2 is linear. The individual bond dipoles cancel each other as they point in opposite direction and are equal in magnitude. Hence, the molecule is non polar with zero dipole moment.

QUESTION: 8

Bond length of H— Cl is 1.2476 Thus, its dipole moment is
Solution:



QUESTION: 9

PCIx F5 - x shows non-polar behaviour when x is
Solution:


The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because the configuration of PF5 has trigonal bipyramidal, and PF5 consists of a central phosphorus atom, surrounded by five fluorine atoms. So the three planar fluorine’s electronegativity cancels out each other, which resulting PF5 is a nonpolar molecule.

similarly, in PCl5 case chlorine's electronegativity cancels out each other.

 In case of PCl3​F2​, the molecule is non-polar, even though the fluorine atoms are slightly more electro-negative than the chlorine. This could be explain in a couple ways. The more intuitive approach is to consider how the presence of two fluorine atoms would create symmetry. The less intuitive, but more accurate, process would be to realize that the structure of the molecule is divided in to two non-polar structure(trigonal planer and linear). With other molecules, like PF3​Cl2​ it's not possible to divide it in to non-polar shapes. The repulsion between the fluorine atom is greater than that between the chlorine. Thus PF3​Cl2​ is polar.

 

QUESTION: 10

Which of the following bonds is the weakest?
Solution:

van der Waals` force is the weakest force of attraction and covalent bond is the strongest. Correct order is 

QUESTION: 11

 In which of the following sets of compounds dipole moment of I is larger than that of II?
Solution:



QUESTION: 12

Which of the following would have a permanent dipole?
Solution:


(c) SF4 has one lone pair making it polar permanently.

sp3d-hybridised S-atom.
(d) XeF4 has two lone pairs in opposite side thus μ = 0 

*Multiple options can be correct
QUESTION: 13

Direction (Q. Nos. 13-15) This section contains 4 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

Q. Which of the following has/have zero dipole moments?
Solution:





CO, SO2, H2O, NH3 and HCI have polarity thus, have dipole moments.

*Multiple options can be correct
QUESTION: 14

Dipole moment is shown by 
Solution:


*Multiple options can be correct
QUESTION: 15

The molecules that will have dipole moment are
Solution:


QUESTION: 16

Direction (Q. Nos. 16-17) This section contains  a paragraph, each describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given options (a),(b),(c),(d).

CH4 is subjected to photochemical reaction and changes to CH3CI, CH2CI2, CHCI3 and CCI4.

Q. 
Select the correct alternate.
Solution:


Resultant dipole moment of CCI4 = 0.

QUESTION: 17

CH4 is subjected to photochemical reaction and changes to CH3CI, CH2CI2, CHCI3 and CCI4.

Q. One of the intermediates of the photochemical reaction is
Solution:


 has one unpaired electron in unhybridised p-orbital.
Thus, sp2-hybridised paramagnetic.

*Answer can only contain numeric values
QUESTION: 18

Direction (Q. Nos. 18 and 19) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive).

Q. How many of the following molecules are polar?

Cl2, ICI, BF3, NO, SO2
XeF4, CH2CI2, OCS, CO2

Solution:

Due to electronegativity difference between the bonded atoms. ICI, NO, SO2, CH2CI2, OCS are polar compounds.




*Answer can only contain numeric values
QUESTION: 19

How many molecules out of the following have non-zero value of dipole moments?

CH2CI2, CH4, CCI4, H2O, CHCI3, p-dichloro benzene, o-cresol, p-xylene, SCI2, BF3, IBr, HCHO

Solution:

CH2CI2,H2O,CHCI3,o-cresol, SCI2, IBr and HCHO (in all seven) have dipole moments.

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