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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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Aqueous solution of FeSO_(4) does not produce precipitate with:

Aqueous solution of FeSO_(4) does not produce precipitate with:

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. The salt A is:

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. On treatment with a KI solution, an aqueous solution of A will give:

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. A solution of A, when treated with NH_(3) , gives:

RESONANCE ENGLISH-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. Interfering radicals interfere the test of

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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. A current of 2.0 A when passed for 5 hrs through a molten slat deposit...

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  8. Which of the following can evolve more than one gas (vapour) if heated...

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  9. Zinc sulphide reacts with dilute H(2)SO(4) to liberate which gas.

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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. An electric kettle has two coils. When one of these is switched on, th...

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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 one of the following ions does not give borax bead test ?

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  17. Concrete is produced form a mixture of cement, water and small stones....

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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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