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For the detection of phosphorus, the org...

For the detection of phosphorus, the organic compound after fustion with `Na_(2)O_(2)` is extracted with water, boiled with `HNO_(3)` and then ammonium molybdate is added to it. A yellow pppt. Is obtained which is due to the formation of

A

ammonium phosphate

B

ammonim phosphomolybdate

C

ferric phosphate

D

disodium ammonium phosphate

Text Solution

Verified by Experts

The correct Answer is:
b
Ammonium phosphomolybdate.
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X+HNO_(3) to Y+NO_(2)+H_(2)O+S , Y+Ammonium molybdate to yellow ppt. identify X:

Here paragraphs are given. Based upon the paragraphs some multiple choice questions are given. Each question has 4 choices A, B, C and D. Out of which one is correct. Choose the correct option Paragraph/comprehension In the detection of elements by Lassaigne’s test, the covalent compounds are converted into ionic compounds on fusion with sodium metal. The nitrogen, sulphur and halides present in the organic compounds are test with their usual tests. In this test blue or green colour is obtained when only nitrogen is present whereas red colour is obtained when both nitrogen and sulphur are present. The Lassaigne’s extract is boiled with HNO_(3) so as to decompose Na_(2) and NaCN if present. Phosphorus is detected in the organic compound by fusing it with sodium peroxide. When sodium phosphate formed is detected with cone. HNO_(3) and ammonium molybdate. Sodium nitroprusside reacts with sulphide ion to give a purple colour due to the formation of

Knowledge Check

  • A compound X react with Na_(2)O_(2) and forms Y , Y is reacted with nitric acid and then treated with ammonium molybdate to give yellow ppt.

    A
    Phosphorus
    B
    Nitrogen
    C
    Fluorine
    D
    Sulphur

  • Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elementsline N,S,P andhalogensaredetected by their usual tests. Q. Yellow precipitate in the detection of phosphorous when an organic compound is heated with Na_2O_2 and then boiled with conc. HNO_3 followed by the addition of ammonium molybdate is duw to the formation of :

    A
    `(NH_4)_3.PO_4.12MoO_3`
    B
    `(NH_4)_3.PO_4.6MoO_3`
    C
    `(NH_4)_3.PO_4.12MoO_2`
    D
    `(NH_4)_3PO_4.6MoO_2`

  • Which of the following compounds on reaction with Na_(2)O_(2) gives yellow colour?

    A
    `Zn(OH)_(2)`
    B
    `Cr(OH)_(3)`
    C
    `Al(OH)_(3)`
    D
    `Fe(OH)_(3)`

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