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Why is a freshly prepared solution of Fe...

Why is a freshly prepared solution of `FeSO_(4)` used for the detection of nitrate and nitrite ?

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This is because `Fe^(2+)` ions on long standing are oxidised to `Fe^(3+)` ions which are not used for the detection of nitrate and nitrite.
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RESONANCE-QUALITATIVE ANALYSIS (ANION)-Exercise-1
  1. Identify the gas A, B and C.

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  2. Why heavy metal chlorides such as Hg(2)Cl(2), AgCl, PbCl(2) etc. do no...

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

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  4. Cu^(2+) " and" Ba^(2+) interfere in the flame test for borate, why ?

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  5. In which of the following reagents, the white precipitate fo PbSO(4) i...

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

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  7. When a metal sulphate is heated in dry test tube, the colour changes f...

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  8. Which of the following can not evolve more than one gas (vapour) if he...

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  9. On heating, a white amorphous inorganic compound becomes yellow and on...

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  10. Which of the following metal carbonates liberate. CO(2)(g) on heating ...

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  11. In which of the following reactions a brown coloured gas is evolved ?

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  12. Why is concentrated HCl used to dissovle the given metal salt in the f...

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  13. The hottest part of the flame of a Bunsen burner is the

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  14. Metal (M) shows crimson red colour in flame test and its halide is del...

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  15. In Borax bead test, metal oxides react with B(2)O(3) and form a colour...

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  16. Which does not give borax bead test?

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  17. In the Borax bead test of Co^(2+), the blue colour of bead is due to t...

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  18. A salt gives white residue in charcoal cavity test but in cobalt nitra...

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  19. Which of the following anions are identified by dil. HCl :

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  20. Two inorganic compounds A and B were heated in a dry test tube. A evol...

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