In the trimer form of sulphur trioxide $(S_3O_9)$,each sulphur atom is bonded with:

  • A
    four oxygen atoms
  • B
    three oxygen atoms
  • C
    two oxygen atoms
  • D
    two sulphur atoms

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The total number of lone pairs of electrons in the given molecule is

The number of molecules from the following which contain only two lone pairs of electrons is $........$.
$H_2O, N_2, CO, XeF_4, NH_3, NO, CO_2, F_2$

Which of the following species are isoelectronic?
$I. CH_3^+$
$II. NH_2^-$
$III. NH_4^+$
$IV. NH_3$

Choose the incorrect order of the given properties.

$BCl_3$ does not exist as a dimer,but $BH_3$ exists as a dimer $(B_2H_6)$ because:

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