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प्रश्न
What do you see when sodium hydroxide solution is added to zinc sulphate solution, till it is in excess?
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उत्तर
When sodium hydroxide solution is added to zinc sulphate solution, till it is in excess whi te gelatinous precipi tates of Zn (OH)2 are formed and due to the excess of sodium hydroxide these ppt. get dissolved immidiately :
\[\ce{ZnSO4 + 2NaOH ->\underset{\text{white gelatinous ppt.}}{Zn(OH)2 + Na2SO4}}\]
\[\ce{Zn(OH)2 + 2NaOH ->\underset{\text{colourless}}{Na2ZnO2} + 2H2O}\]
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संबंधित प्रश्न
Give a chemical test to distinguish between the given pairs of chemicals:
Lead nitrate solution and Zinc nitrate solution
Name the metal hydroxides which are :
(a) Insoluble (b) Soluble in
(i) Caustic soda solution (ii) Ammonium hydroxide solution.
What do you observe when caustic soda solution is added to the following solution: first a little and then in excess : FeCl3
What do you understand by amphoteric oxide? Give the balanced equations for the reaction with three different amphoteric oxides with a caustic alkali. Write your observation if any.
Name a metallic hydroxide soluble in excess of NH4OH.
Name: A metallic oxide soluble in excess of caustic soda solution.
Name: A weak alkali.
Fill in the blank.
The hydroxide which is soluble in excess of NaOH is _________ [Zn(OH)2 / Fe(OH)3 / Fe(OH)2].
Write balanced equations for a metal that evolves into a gas which burns with a pop sound when boiled with alkali solutions.
Write balanced equations for a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
