Q28 / 160 · TS EAMCET 2024 (10 May Shift 1) · Chemistry

Among the hybrides $\mathrm{NH}_3, \mathrm{PH}_3$ and $\mathrm{BiH}_3$, the hybride with highest boiling point is X and the hybride with lowest boiling point is Y . What are X and Y respectively?

  • A
    $\mathrm{PH}_3, \mathrm{NH}_3$
  • B
    $\mathrm{NH}_3, \mathrm{PH}_3$
  • Correct answer
    C
    $\mathrm{BiH}_3, \mathrm{PH}_3$
  • D
    $\mathrm{NH}_3, \mathrm{BiH}_3$

Solution

Order of boiling point of hydride of nitrogen family $\mathrm{PH}_3 \lt \mathrm{AsH}_3 \lt \mathrm{NH}_3 \lt \mathrm{SbH}_3 \lt \mathrm{BiH}_3$ B.P. highest X is $\mathrm{BiH}_3$ B.P. lowest Y is $\mathrm{PH}_3$

Hence, the correct answer is option: 'C'.

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