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प्रश्न
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.
उत्तर
Amphoteric oxides : Amphoteric oxides are those compounds, which react with both acids and alkalis to form salt and water.
For example: Oxides of Aluminium, zinc and lead are amphoteric in nature.
Balanced equations for the reaction of different amphoteric oxides with a caustic alkali :
Amphoteric oxide + Alkali → Salt + Water
(a) \[\ce{\underset{\text{White}}{ZnO} + 2NaOH ->\underset{\text{Sodium zincate(Colourless)}}{Na2ZnO2 + H2O}}\]
(b) \[\ce{\underset{\text{White}}{Al2O3} + 2NaOH ->\underset{\text{Sodium aluminate(White)}}{NaAlO2 + 2H2O}}\]
(c) \[\ce{\underset{\text{Yellow}}{PbO} + 2NaOH ->\underset{\text{Sodium plumbite(Colourless)}}{Na2PbO2 + H2O}}\]
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संबंधित प्रश्न
State one relevant observation for the following.
Lead nitrate solution is treated with sodium hydroxide solution dropwise till it is excess.
A compound X (having the vinegar-like smell) when treated with ethanol in the presence of the acid Z, gives a compound Y which has a fruity smell.
The reaction is:
1) Identify Y and Z.
2) Write the structural formula of X.
3) Name the above reaction.
Name a strong alkali.
Name a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
Name: Two coloured ions
Fill in the blank.
To distinguish soluble salts of zinc and lead ______ [NaOH / NH4OH]can be used.
When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?
State your observation when zinc chloride solution, zinc nitrate solution, and zinc sulphate solutions are added individually to barium chloride solution.
Write balanced equations for a metal that evolves 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.
