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(A) Xenon tetrafluoride molecule is deno...

(A) Xenon tetrafluoride molecule is denoted as `AB_4E_4`, where E is a lone pair
(R) All `AB_4` type molecules have no dipolemoment, because of symmetrical tetrahedral structure.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
D
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During chemical bond formation the potential energy of the bonding atoms decreases. According to VBT bond strength depends on extent of over lapping. Shapes and bond angles of the molecules were explained by VSEPR theory. This theory explains the Geometry of the molecules based on the repulsions among the valance shell electron pairs. As number of lone pairs increases repulsions increases apd the shape is altered accordingly. AB_(4) E_(2) type of molecule with square planar shape is

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 The dipole moment of NF_(3) is very much less than that of NH_(3) because :

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AAKASH SERIES-NOBLE GASES-OBJECTIVE EXERCISE - 4 (ASSERTION (A) AND REASON (R ) TYPE QUESTIONS)
  1. (A) Atomicity of argon is unity (R) Ratio of molar heat capacities...

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  2. (A) Density of nitrogen obtained in chemical methods is more than that...

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  3. (A) Xenon tetrafluoride molecule is denoted as AB4E4, where E is a lo...

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  4. (A) First ionisation potential of helium is highest (R) The electro...

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  5. (A) Valency of xenon in second excited state is two (R) Xenon forms ...

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  6. (A) Boiling point of helium is least (R) Intermolecular forces of ...

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  7. (A) All the noble gases have ns^2 np^6 electronic configuration in the...

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  8. (A) Helium is regarded as the least volatile of all liquids. (R) ...

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  9. (A) Deep sea divers use helium-oxygen mixture for respiration (R)...

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  10. (A) Xenonmonoxytetrafluoride has square planar structure. (R) Xeno...

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  11. (A) Group 18 elements are called noble gases (R) group 18 elements...

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  12. (A) All noble gases occur in atmosphere (R) Among noble gases 'R' ...

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  13. (A) 1 lit of dry air contains 10ml of noble gas mixture (R) The a...

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  14. (A) Helium is present in radio active minerals like pitchblende, monaz...

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  15. (A) 1 mole Ra^226 on alpha disintegration will give 44.8 lit of gaseou...

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  16. (A) Noble gases have very high ionization enthalpies in periodic table...

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  17. (A) Noble gas elements have very low melting and boiling points (...

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  18. (A) The first noble gas compound synthesised is Xe[PtF6 ] (R) Io...

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  19. (A) XeF2 is a linear molecule (R) In XeF2 xenon undergoes sp^3d ...

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  20. The hydrolysis of XeF6 is not a redox reaction (R) XeF6 on comp...

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