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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Reaction of thionyl chloride with white phosphorus forms a compound $[ A ]$, which on hydrolysis gives $[B]$, a dibasic acid.$[A]$ and $[B]$ are respectively
  • A
    $P _4 O _6$ and $H _3 PO _3$
  • ✓
    $PCl _3$ and $H _3 PO _3$
  • C
    $PCl _5$ and $H _3 PO _4$
  • D
    $POCl _3$ and $H _3 PO _4$
✓

Answer

Correct option: B.
$PCl _3$ and $H _3 PO _3$
b
$P _4+8 SOCl _2 \rightarrow 4 PCl _3+4 SO _2+2 S _2 Cl _2$

$PCl _3+3 H _2 O \rightarrow H _3 PO _3+3 HCl$

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