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

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Among the following statement which one is true?
  • A
    $NH_3$ is less soluble than $PH_3$ in water
  • B
    $NH_3$ is stronger base and stronger reducing agent than $PH_3$
  • C
    $NH_3$ has higher boiling point than $PH_3$ and has lower melting point than $PH_3$
  • ✓
    $PH_3$ is stronger reducing agent than $NH_3$ and it has lower critical temperature than $NH_3$
✓

Answer

Correct option: D.
$PH_3$ is stronger reducing agent than $NH_3$ and it has lower critical temperature than $NH_3$
d
$NH_3$ is a weak reducing agent than $PH_3$, because $X-H$ bond strength decreased down the group. Due to absence of $H-$ bonding, only weak vander Waals force of attraction exists in $PH_3$, It has lower critical temperature than $NH_3$.

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