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Explain why : A blood red colouration...

Explain why :
A blood red colouration is obtained on addition of `FeCl_3 `to Lassaigne's solution when the compound contains both N and S.

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`3NaCNS + FeCl_3 to underset("(Blood red)")(Fe(CNS)_3) + 3 NaCl`
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ICSE-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES AND TECHNIQUES -SHORT ANSWER TYPE QUESTIONS
  1. What is sodium extract and how is it prepared ?

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  2. Lassaigne's test for the detection of nitrogen fails in

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  3. Explain why : A blood red colouration is obtained on addition of Fe...

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  4. Explain why : A black precipitate is obtained in the Lassaigne's te...

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  5. Explain why : A blue or green colour in the flame is obtained during...

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  6. Explain why : Presence of Cl in a compound cannot be detected by ad...

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  7. Explain why : No precipitate is obtained on adding AgNO3 to chlorome...

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  8. Describe the principle involved in the quantitative estimation of nitr...

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  9. Describe the Carius method for the estimation of sulphur in a compound...

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  10. Describe the principle involved in the estimation of phosphorus in an ...

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  11. Describe the principle and procedure of determining molecular mass of ...

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  12. Describe the principle involved in the determination of molecular mass...

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  13. On what principle is the chloroplatinate salt method for the determina...

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  14. What do you understand by inductive effect? Illustrate your answer wit...

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  15. How is + l-effect different from - l-effect? Illustrate with examples.

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  16. Why is +l-effect of t-butyl group greater than that of isopropyl group...

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  17. Why is dichloroacetic acid stronger than monochloroacetic acid ?

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  18. Define electromeric effect.

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  19. What type of effects are involved in the following reactions ?

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  20. What are the main points of difference between inductive and electrome...

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