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AIIMS 2016
Exam
AIIMS
Year
2016
Subject
Chemistry
Chapter
Ionic Equilibrium

AIIMS 2016 · Chemistry · Ionic Equilibrium

Assertion : H_2 ~S is stronger acid than PH_3 . Reason : S is more...

Assertion : H2 S\mathrm{H}_2 \mathrm{~S} is stronger acid than PH3\mathrm{PH}_3. Reason : SS is more electronegative than P\mathrm{P}, conjugate base HS−\mathrm{HS}^{-}is more stable than H2P−\mathrm{H}_2 \mathrm{P}^{-}.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

H2 S(g)+aq⟶HS(aq)−+H(aq)+PH3(g)+aq⟶H2P−+H(aq)+\begin{aligned} & \mathrm{H}_2 \mathrm{~S}_{(g)}+a q \longrightarrow \mathrm{HS}_{(a q)}^{-}+\mathrm{H}_{(a q)}^{+} \\ & \mathrm{PH}_{3(g)}+a q \longrightarrow \mathrm{H}_2 \mathrm{P}^{-}+\mathrm{H}_{(a q)}^{+}\end{aligned} As S\mathrm{S} is more electronegative than P\mathrm{P}, conjugate base HS−\mathrm{HS}^{-}is more stable than H2P−\mathrm{H}_2 \mathrm{P}^{-}. Hence, H2 S\mathrm{H}_2 \mathrm{~S} is stronger acid than PH3\mathrm{PH}_3.
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