Advertisements
Advertisements
प्रश्न
Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.
Advertisements
उत्तर
Zinc oxide:
\[\ce{\underset{white}{ZnO} + \underset{(colourless soluble)}{\underset{caustic soda}{2NaOH}}-> \underset{sodium zincate}{Na2ZnO2} + H2O}\]
Aluminium oxide:
\[\ce{\underset{white}{Al2O3} + \underset{caustic soda}{2NaOH}->\underset{(white)}{\underset{sodium meta aluminate}{2NaAlO2}} + H2O}\]
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.
Match the salts given in Column I with their method of preparation given in Column II.
| Column I | Column II | ||
| 1 | Pb(NO3)2 from PbO | A | Simple displacement |
| 2 | MgCl2 from Mg | B | Titration |
| 3 | FeCl3 from Fe | C | Neutralization |
| 4 | NaNO3 from NaOH | D | Precipitation |
| 5 | ZnCO3 from ZnSO4 | E | Combination |
Choose the correct answer from the options given below :
Which one is colourless anion?
Choose the correct answer from the options given below :
Sodium zincate (Na2ZnO2) is
You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
Only zinc hydroxide
Sodium hydroxide solution can be used to distinguish between i. iron (II) sulphate solution and (ii) iron (III) sulphate solution; because these solutions give different coloured precipitates with sodium hydroxide solution. Give the colour of the precipitate formed with each of the solution.
Give one chemical test to distinguish between the following pair of compounds:
Zinc sulphate solution and Zinc chloride solution
What do you understand by amphoteric oxide?
Write a balanced equation for the following conversion:
\[\ce{ZnSO4 ->[A]Zn(OH)2->[B]Na2ZnO2}\]
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?
