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प्रश्न
Which one is colourless anion?
पर्याय
\[\ce{HCO^-_3}\]
\[\ce{Cr2O^2-_4}\]
\[\ce{Cr2O^2-_7}\]
\[\ce{MnO^-_4}\]
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उत्तर
\[\ce{HCO^-_3}\]
Explanation:
The bicarbonate ion \[\ce{(HCO^-_3)}\] is colourless because it is composed of representative elements (hydrogen, carbon, and oxygen) which do not possess partially filled d-orbitals or undergo charge-transfer transitions in the visible light spectrum. In contrast, the other options contain transition metals that exhibit vibrant colors due to charge-transfer transitions chromate \[\ce{(CrO^{2-}_4)}\] is yellow, dichromate \[\ce{(Cr2O^{2-}_7)}\] is orange, and permanganate \[\ce{(MnO^-_4)}\] is deep purple.
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संबंधित प्रश्न
Identify the salts P and Q from the observations given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in Ammonium hydroxide solution.
Match the salts given in Column I with their method of preparation given in Column II.
| Column I | Column II | ||
| 1 | Pb(NO3)2 from PbO | A | Simple displacement |
| 2 | MgCl2 from Mg | B | Titration |
| 3 | FeCl3 from Fe | C | Neutralization |
| 4 | NaNO3 from NaOH | D | Precipitation |
| 5 | ZnCO3 from ZnSO4 | E | Combination |
You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
- only copper hydroxide
- only zinc hydroxide
- both copper hydroxide and zinc hydroxide.
You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
Only zinc hydroxide
What will you observe when barium chloride solution is added to iron(II) sulphate solution.
Give one chemical test to distinguish between the following pair of compounds:
Iron (II) chloride solution and iron (III) chloride solution
The questions (i) to (v) refer to the following salt solutions listed A to F.
A.Copper Nitrate
B.Iron (II) Sulphate
C.Iron (III) chloride
D.Lead Nitrate
E.Magnesium sulphate
F.Zinc chloride
(I)Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by a barium chloride solution?
(II)Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(III)Which solution will give white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(IV)Which solution becomes a deep/inky blue colour when the excess of ammonium hydroxide is added to it?
(V)Which solution gives a white precipitate with an excess of ammonium hydroxide solution?
Write balanced equation for a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
