Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • During the detection of phosphorus in an organic compound the yellow colour is due to:Option: 1 <img alt="\mathrm{\left( NH _{4}\right)_{3} PO _{4} \

During the detection of phosphorus in an organic compound the yellow colour is due to:

Option: 1

\mathrm{\left( NH _{4}\right)_{3} PO _{4} \cdot 12 MoO _{3}}


Option: 2

\mathrm{F e_{4}\left[F e(C N)_{6}\right]}


Option: 3

\mathrm{NH _{4} I}


Option: 4

\mathrm{N a_{4}\left[ Fe ( CN )_{6}\right]}


Answers (1)

best_answer

As we have learnt,

Test for Phosphorus: The compound is heated with an oxidising agent (sodium  peroxide). The phosphorus present in the compound is oxidised to phosphate. The solution is boiled with nitric acid and then treated with ammonium molybdate.

Result: A yellow colouration or precipitate of Ammonium Phosphomolybdate indicates the presence of phosphorus.

\mathrm{Na}_{3} \mathrm{PO}_{4}+3 \mathrm{HNO}_{3} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+3 \mathrm{NaNO}_{3}

\\\mathrm{H}_{3} \mathrm{PO}_{4}+12\left(\mathrm{NH}_{4}\right)_{2} \mathrm{MoO}_{4}+21 \mathrm{HNO}_{3} \longrightarrow\: \left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} \cdot 12 \mathrm{MoO}_{3}\: +\: 21 \mathrm{NH}_{4} \mathrm{NO}_{3}\: +\:12\mathrm {H_2O}

Hence, the correct answer is Option (1)

Posted by

chirag

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

Punjab’s new 2-year MBBS bond, fee hike ‘exploitation’, ‘unfair’; interns, doctors shut OPDs in protest
anam-khan

NEET UG 2025 counselling likely to begin on July 1; AIQ seat allocation, court hearing updates
anam-khan

NEET UG: Delhi HC seeks NTA's response on plea alleging defective biometric system at centre

Latest Question