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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Which of the following statements is not true
  • A
    The spin magnetic moment of $KO_2$ is $1.73\,BM$
  • B
    The hybridisation of $B$ in $H_3BO_3$ is $sp^2$
  • C
    In $H_2S_2O_8\, S-S$ linkage is present
  • ✓
    In $ClF_3$ axial and Equatorial bonds are not identical
✓

Answer

Correct option: D.
In $ClF_3$ axial and Equatorial bonds are not identical
d
The valence shell electron configuration of ground state of sulphur is $3 \mathrm{s}^{2} 3 \mathrm{p}^{4}$

The valence shell electron configuration of first excited state of sulphur is $3 \mathrm{s}^{2} 3 \mathrm{p}^{3} 3 \mathrm{d}^{1}$

The valence shell electron configuration of second excited state of sulphur is $3 \mathrm{s}^{1} 3 \mathrm{p}^{2} 3 \mathrm{d}^{2}$.

This is followed by sp ${ }^{3} \mathrm{d}^{2}$ hybridization to form $\mathrm{SF}_{6}$.

Thus $\mathrm{SF}_{6}$ is formed in the second excitation state of sulphur atom.

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