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प्रश्न
Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.
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उत्तर
Zinc oxide:
\[\ce{\underset{white}{ZnO} + \underset{(colourless soluble)}{\underset{caustic soda}{2NaOH}}-> \underset{sodium zincate}{Na2ZnO2} + H2O}\]
Aluminium oxide:
\[\ce{\underset{white}{Al2O3} + \underset{caustic soda}{2NaOH}->\underset{(white)}{\underset{sodium meta aluminate}{2NaAlO2}} + H2O}\]
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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.
_____________ (AgCl / PbCl2), a white precipitate is soluble in excess NH4OH
State your observation When excess sodium hydroxide is added to calcium nitrate solution
Name a solution that will separate the component of the following mixture: CaO from PbO
You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
Only zinc hydroxide
Give one chemical test to distinguish between the following pair of compounds:
Iron (II) chloride solution and iron (III) chloride solution
State the colour of the residue formed when nitrates of :
1. Calcium
2. Zinc
3. Lead
4. Copper are strongly heat
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
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?
An amphoteric oxide.
