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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
The incorrect statement regarding $15^{th}$ group hydrides $(EH_3)$ . $[E = N, P, As, Sb, Bi]$
  • A
    $NH_3 > PH_ 3 > AsH_ 3 > SbH_ 3 > BiH_ 3 :$ Thermal stability
  • B
    $N-H > P-H > As-H > Sb-H > Bi-H : E-H$ bond dissociation enthalpy
  • ✓
    $NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3 :$ Reducing character
  • D
    $NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3 :$ Basicity
✓

Answer

Correct option: C.
$NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3 :$ Reducing character
c
${\text{Reducing character}} \propto \frac{1}{{'E - H'\,bond\,dissociation\,enthalpy}}$

Hence, correct reducing character is $NH_3 < PH_3 < AsH_3 < SbH_3 < BiH_3$

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