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प्रश्न
Write a balanced equation for the following conversion:
\[\ce{ZnSO4 ->[A]Zn(OH)2->[B]Na2ZnO2}\]
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उत्तर
A: \[\ce{\underset{(white gelatinous)}{ZnSO4} + 2NaOH -> Zn(OH)2\downarrow + Na2SO4}\]
In excess Na2ZnO2 dissolves in NaOH
B: \[\ce{Zn(OH)2 + 2NaOH -> \underset{(excess)}{Na2ZnO2} + \underset{(colourless)}{\underset{Soluble}{2H2O}}}\]
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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 observations when barium chloride solution is mixed with sodium sulphate 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 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 a 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 excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide?
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
Name the products formed when the reaction with two different amphoteric oxides with a caustic alkali.
Write a balanced equation for the following conversion:
\[\ce{CuSO4 ->[A]Cu(OH)2 ->[B] [Cu(NH3)4]SO4}\]
A given white crystalline salt was tested as follows:
A flame test on the salt gave a persistent golden-yellow colourisation. What conclusions can be drawn for the observation?
Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. What is the metal ion present in solution A?
An amphoteric oxide.
