The structure of XeF6, is experimentally determined to be distort

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51.

The bond angle in NF3 (102.3°) is smaller than NH4 (107.2°). This is because of

  • large size of F compared to H

  • large size of N compared to F

  • opposite polarity of N in the two molecules

  • small size of H compared to N


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52.

The structure of XeF6, is experimentally determined to be distorted octahedron. Its structure according to VSEPR theory is

  • octahedron

  • trigonal bipyramid

  • pentagonal bipyramid

  • tetragonal bipyramid


C.

pentagonal bipyramid

In XeF6 , Xe, the central atomc ontains, 8 valence electrons. Out of which 6 are utilised with fluorine in bonding (i.e., it contains six bond pairs of electrons) while one pair remains as lone pair.
Thus, the total pairs = 6 + 1 = 7
Hence, its shape is pentagonal bipyramid according to VSEPR theory.

             


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53.

Addition of excess potassium iodide solution to a solution of mercuric chloride gives the halide complex

  • tetrahedral K2[HgI4]

  • trigonal K [HgI3]

  • linear Hg2I2

  • square planar K2[HgCl2I2]


54.

Tautomerism is exhibited by

  • (Me3CCO)3CH


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55.

The increasing order of O - N - O bond angle in the species NO2, NO2+ and NO2- is

  • NO2- < NO2 < NO2+

  • NO< NO2< NO2+

  • NO2< NO2< NO2

  • NO< NO2< NO2-


56.

For BCl3, AlCl3 and GaCl3 the increasing order of ionic character is

  • BCl3 < AlCl3 < GaCl3

  • GaCl< AlCl3 < BCl3

  • BCl3 < GaCl3 < AlCl3

  • AlCl3 < BCl3 < GaCl3


57.

The paramagnetic behaviour of B2 is due to the presence of

  • two unpaired electrons in πb MO

  • two unpaired electrons in π* MO

  • two unpaired electrons in σ* MO

  • two unpaired electrons in σb MO


58.

CO is practically non-polar since

  • the σ-electron drift from C to O is almost nullified by the π-electron drift from O to C

  • the σ-electron drift from O to C is almost nullified by the π-electron drift from C to O

  • the bond moment is low

  • there is a triple bond between C and O


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59.

The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl3 are

  • sp,0

  • sp2, 0

  • sp3, 0

  • dsp2, 1


60.

Which one of the following is paramagnetic?

  • N2

  • NO

  • CO

  • O3


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