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Why does a paper soaked in K(2)Cr(2)O(7)...

Why does a paper soaked in `K_(2)Cr_(2)O_(7)` solution turn green in the detection of `SO_(3)^(2-)` ion?

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The paper turns green because the `SO_(2)` gas evolved `SO_(3)^(2-)` salt reduced `K_(2)Cr_(2)O_(7)` to `Cr_(2)(SO_(4))_(3)` which turns the paper green.
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CENGAGE CHEMISTRY-QUALITATIVE INORGANIC SALT ANALYSIS-Viva Voce Questions And Part-A (Analysis Of Anions)
  1. Why does lime water turns milky on bubbling CO(2) gas through it?

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  2. Name the anions whch giive brown fumes on reacting with dilute/conc. H...

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  3. Why does a paper soaked in K(2)Cr(2)O(7) solution turn green in the de...

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  4. Can filter paper dipped in silver nitrate solution instead of lead ace...

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  5. A gas evolved with effervescence on treating a salt with dil. HCl may ...

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  6. How will you distinguish between carbonate and bocarbonate ions?

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  7. How can sulphide ions be distinguished from sulphite ions?

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  8. How will you distinguish betweebn sulphate and thiosulphate ions?

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  9. How will you distinguish between sulphite and sulphate ions?

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  10. How can nitrite ion be distinguished from nitrate ion?

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  11. What is the formula of compound present in brown ring?

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  12. Why is a freshly prepared solution of FeSO(4) used for the detection o...

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  13. Why does only the organic layer assure colour and not the aqueous laye...

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  14. What happens when chloride, bromide and iodide are separately heated w...

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  15. How do you distinguish between Br^(ɵ) and NO(3)^(ɵ) ions?

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  16. Given salt is a bromide or iodide. How will you identify it by treatin...

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  17. Why does the chromyl chloride test fail with Br^(ɵ) and I^(ɵ)?

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  18. For testing SO(4)^(2-) with BaCl(2) solution why should sodium carbona...

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  19. Can any other reagent in place of limwe water be employed for identifi...

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  20. At times the solution of lime water appears milky. Comment.

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