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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
Choose the most appropriate answer from the following list of oxides which fit the description.
[SO2, SiO2, Al2O3, MgO, CO, Na2O]
A basic oxide.
Name
a metallic hydroxide soluble in excess of NH4OH.
Name a strong alkali.
Name a weak alkali.
Name the metal hydroxides which are :
(a) Insoluble (b) Soluble in
(i) Caustic soda solution (ii) Ammonium hydroxide solution.
Name the metal hydroxides which are soluble in caustic soda solution.
Name a metallic hydroxide soluble in excess of NH4OH.
Name: A weak alkali.
Name: Two bases which are not alkalis but dissolve in strong alkalis.
Write balanced equations for a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
