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JEE Advanced 2008Paper 1
Exam
JEE Advanced
Year
2008
Paper
Paper 1
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Advanced 2008 · Paper 1 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Paragraph: There are some deposits of nitrates and phosphates in...

Paragraph: There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridisation easily explains the ease of sigma donation capability of NH3\mathrm{NH}_3 and PH3\mathrm{PH}_3. Phosphine is a flammable gas and is prepared from white phosphorus.Question: White phosphorus on reaction with NaOH\mathrm{NaOH} gives PH3\mathrm{PH}_3 as one of the products. This is a

Options

  1. Adimerisation reaction
  2. Bdisproportionation reaction
  3. Ccondensation reaction
  4. Dprecipitation reaction

Correct answer

B. disproportionation reaction

Step-by-step solution

White phosphorus on reaction with NaOH\mathrm{NaOH} gives PH3\mathrm{PH}_3 as one of the product in disproportionation reaction P4+3NaOH+3H\mathrm{P}_{4}+3 \mathrm{NaOH}+3 \mathrm{H}}_{2} O⟶3NaH2PO\mathrm{O} \longrightarrow3 \mathrm{NaH}_{2} \mathrm{PO}}_{2}+ PH3\mathrm{PH}_{3}
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