The bond angle in NF3 (102.3°) is smaller than NH4 (107.2°

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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


C.

opposite polarity of N in the two molecules

In NF3 N is less electronegative as compared to F but in NH3 it is more electronegative than H. And in case of same central atom, as the electronegativity of other atoms increases, bond angle decreases. Thus, bond angle in NF3 is smaller than that in NH3 because of the difference in the polarity of N in these molecules.

                


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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


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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