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The shapes of molecules of BF3, NH3 and ...

The shapes of molecules of `BF_3`, `NH_3` and `ClF_3` are

A

all trigonal planar

B

trigonal planar, trigonal pyramidal and pyramidal

C

trigonal planar. trigonal pyramidal and trigonal planar

D

trigonal planar, trigonal pyramidal and T shaped

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The correct Answer is:
D
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A polar covalent bond with positive and negative charge centres at its ends is called a dipole. The polarity of a dipole is measured by its dipole moment. Mathematically it is expressed as dipole moment, mu=q xx d where q and d are the net charge and the distance between the two charges respectively. Dipole moment is a vector quantity. The net dipole moment of a polyatomic molecule is the resultant of the various bond moments present in the molecule. The values of dipole moment are expressed in Debye (D) or in SI units in terms of coulomb- metre (Cm). One of the most important applications of dipole moment is in the determination of geometry and shape of molecules besides prediction of a number of properties of the molecules. The molecules BF_3 and NH_3 both are covalent compounds but BF_3 is non-polar while NF_3 is polar . The reason is that

The correct increasing bond angle among BF_3 , PF_3 and ClF_3 follows the order

DINESH PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Ultimate Preparatory Package
  1. Consider the b.pr. of Br2 and ICl. The b.pt. of Br2

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  2. The decreasing order of polarity of the bonds in NH3, PH3, AsH3 and Sb...

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  3. The substance with highest boiling point out of the following H2, He, ...

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  4. At 300 K and 1.00 atm. pressure, the density of gaseous HF is 3.17 gL^...

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  5. The suggested molecular orbital electronic configuration of Co is : KK...

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  6. In N2H4 (hydrazine) both the nitrogen atoms are

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  7. The expected shape of Br3^- ion is

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  8. The shapes of molecules of C Cl4, XeF4 and SF4 are

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  9. The shapes of molecules of BF3, NH3 and ClF3 are

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  10. Non-bonding orbitals have

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  11. Suppose energy level diagram used for O2 F2 etc. is used for all homon...

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  12. Arrange the following in the increasing order of melting points (a)N...

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  13. The number of lobes in delta and delta^** formed by the overlap of two...

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  14. Ground state He2 does not exist. An electronic excited state of He2

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  15. The energy of sigma(2s), is greater than that of sigma(1s)^** orbital ...

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  16. A molecule of chloral hydrate contains two -OH groups attached to a si...

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  17. The bond length in O2^+, O2 ,O2^- and O2^(2-) follows the order :

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  18. The order of energies of following combination (a)2HHe (b)H2+He2 (c ...

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