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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

Yellow ppt of `(NH_(3))_(3)PO_(4)`

B

Yellow ppt of `C_(6)H_(5)-N=N-C_(6)H_(5)`

C

white ppt of `(NH_(4))_(3)PO_(4)`

D

whit ppt of `(NH_(4))_(2)HPO_(3)`

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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.

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 :

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

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

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. The Lassaigne's extract is boild with dil. HNO_(3) before testing for halogens because

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. Which of the following compound will answer Lassigne's test for nitrogen ?

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. Which of the following will give blood red colour in Lassaigne's test for nitrogen

Acidified K_(2)Cr_(2)O_(7) solution turns green when NasO_(3) is added to it. This is due to the formation of :

AAKASH INSTITUTE-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES AND TECHNIQUES -Assignment(SECTION-A)
  1. A mixture containing urea and napthalene can be separated by

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  2. Principle of crystallization method depends on

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  3. Chloroform and aniline can be purified by

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  4. The principle involved in gas liquid chromatography (GLC) is

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  5. Steam distillation is applied for the separation of those compounds wh...

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  6. The process of differential extraction is based upon

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  7. Glycerol decomposes at its boiling point, the purification of glycerol...

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  8. The Na metal is used in "Lassaigne’s test" is due to

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  9. Which of the following compound will give blood red colour while doing...

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  10. The violet-red colour in the Lassaigne’s test of sulphur is due to ...

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  11. The function of boiling the sodium extract with concentrated nitric ac...

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  12. A mixture of acetone and methanol can be separated by

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  13. In Duma's method for determining the nitrogen content of an organic co...

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  14. 0.2 g of an organic compound on comptete combustion produces 0.18 g of...

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  15. The substance which can be used as an adsorbent in column chromatograp...

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  16. In the estimation of Duma's method 1.18 of an organic compound gave 22...

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  17. 0.5 g of an organic compound cantaining N on Kjeldahlising required 29...

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  18. 0.4 g of Organic Compound gave 0.188g of AgBr. The percentage of Br in...

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  19. Which of the following will not give the Lassaigne test for nitrogen?

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  20. For the detection of phosphorus, the organic compound after fustion wi...

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