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The Lassaigne's extract is boiled with c...

The Lassaigne's extract is boiled with conc `HNO_(3)` with testing for halogens.By doing so it :

A

increases the solubility product of AgCl

B

increasing the concentation `NO_(3)`, ions

C

decomposes `Na_(2)S` and NaCN, if formed

D

helps in the precipitation of AgCl

Text Solution

Verified by Experts

The correct Answer is:
C
`NaCN+HNO_(3)rarrNaNO_(3)+HCN uarr`
`Na_2N+2 HNO_3 rarr 2 NaNO_3+H_2S uarr`
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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

DINESH PUBLICATION-PURIFICATION & CHARACTERISATION OF ORGANIC COMPOUND -Revision Q.F.Competitive exams
  1. 0.1 mol of a carbonhydrate with empirical formula CH(2)O contains 1 g ...

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  2. An organic compound contains carbon, hydrogen and oxygen. Its chemical...

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  3. In Lassaigne's test, a blood red colouration with Fe^(3+) ions indicat...

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  4. The compound formed in the positive test for nitrogen with Lassaigne's...

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  5. In sodium fusion test of organic compounds, the nitrogen of an organic...

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  6. An organic compound which produces a bluish green colored flame on hea...

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  7. Which of the following complex formation indicates presence of sulphur...

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  8. Which of the following compounds gives blood red colouration when its ...

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  9. In the Duma's method of estimation of the organic compound is finaly c...

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  10. Which of the following compounds will not give Lassaigne's test for ni...

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  11. An organic compound on analysis was found to contain 10.06 % Carbon,0....

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  12. In Kjeldahl's method , ammonia from 5 g of food neutralizes 30 cm ^(3)...

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  13. In Lassaigne's test for the detection of halogen , the sodium fusion e...

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  14. In Duma's method,the gas which is collected in Nitromer is 0.35 g of ...

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  15. The Lassaigne's extract is boiled with conc HNO(3) with testing for ha...

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  16. Kjeldahl method for estimation of nitrogen is not applicable to

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  17. A compound contains 38. 8 % C, 16 % H, 42 5 % N. The formula of comp...

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  18. The positive Lassaigne test for nitrogne of any compound from sodium f...

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  19. Correct pair of compounds which gives blue colouration/precipitate and...

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  20. The reaction of nitroprusside anion with sul- phide ion gives purple c...

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