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Why is it necessary to use acetic acid a...

Why is it necessary to use acetic acid and not suplhuric acid for the acidification of sodium extract for testing suplhur by lead acetate test?

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Although the addition of sulphuric acid will precipitate lead sulphate, the addition of acetic acid will ensure a complete precipitation of sulphur in the form of lead sulphate due to common ion effect. Hence, it is necessary to use acetic acid for acidification of sodium extract for testing sulphur by lead acetate test.
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NCERT-ORGANIC CHEMISTRY- SOME BASIC PRINCIPLES AND TECHNIQUES-EXERCISE
  1. Discuss the chemistry of Lassaigne’s test.

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  2. Differentiate between the principle of estimation of nitrogen in an or...

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  3. Discuss the principle of estimation of halogens, sulphur and phosphoru...

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  4. Explain the principle of paper chromatography.

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  5. Why is nitric acid added to sodium extract before adding silver nitrat...

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  6. Explain the reason for the fusion of an organic compound with metallic...

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  7. Name a suitable technique of the components from a mixture of calcium ...

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  8. Explain why an organic liquid vaporises at a temperature below its boi...

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  9. Will C Cl4 give white precipitate of AgCl on heating with nitrate? Giv...

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  10. Why is solution of potassium hydroxide used to absorb carbon dioxide e...

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  11. Why is it necessary to use acetic acid and not suplhuric acid for the ...

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  12. An organic compound contains 69% carbon and 4.8% hydrogen, the remaind...

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  13. 0.50 gm of an organic compound was treated according to Kjeldahl's meg...

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  14. 0.3080 gm of and organic chloro compound gave 0.5740 gm of siver chlor...

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  15. In the estimation of sulphur by carius method, 0.468 gm of an organic ...

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  16. In the organic compound CH(2) = CH – CH(2) – CH(2) – C equivCH, the pa...

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  17. In the Lassaigne’s test for nitrogen in an organic compound, the Pruss...

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  18. Which of the following carbocation is most stable ? (a) (CH(3))(3)C....

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  19. For the purification of organic compounds, the latest technique follow...

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  20. The reaction: CH(3)CH(2)I + KOH(aq)toCH(3)CH(2)OH+KI is classified...

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