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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Correct statement is
  • ✓
    $F -F > Cl -Cl$ bond dissociation energy
  • B
    $HI > HBr > HCl > HF$ thermal stability
  • C
    $HI > HBr > HCl > HF$ reducing power
  • D
    None of these
✓

Answer

Correct option: A.
$F -F > Cl -Cl$ bond dissociation energy
a
$(a)$ Aqueous hydrolysis of $CCl_4$ is not possible due to absence of vacant  orbital on carbon, while hydrolysis of $MgCl_2, AlCl_3 , SiCl_4$ and $PCl_5$ is  possible. Extent of hydrolysis is proportional to the amount of positive formation  charge present on the atomic site prone to attack of $H_2O$ molecules. $CCl_4 < MgCl_2 < AlCl_3 < SiCl_4 < PCl_5$

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