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प्रश्न
Write the observation for the following:
NaOH is added drop-wise till in excess to a solution of zinc sulphate.
उत्तर
When NaOH is added drop-wise to a solution of zinc sulphate, then the following reaction takes place:
\[\ce{ZnSO4 + 2NaOH -> \underset{\text{White gelatinous ppt.}}{Zn(OH)2 v + Na2SO4}}\]
When NaOH becomes in excess, then the following reaction takes place:
\[\ce{Zn(OH)2 + 2NaOH -> \underset{\text{Colourless}}{Na2ZnO2} + 2H2O}\]
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संबंधित प्रश्न
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
CuSO4
Write a balanced equation for this reaction.
Name the method used for preparation of the following salt from the list given below:
Zinc ion and Lead ion.
Choose the correct answer from the options given below :
Which salt solution is soluble in excess of NH4OH
Choose the correct answer from the options given below :
A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is :
State two relevant observations of the following:
Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess
State what do you observe when ammonium hydroxide to Iron (III) sulphate solution.
The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present
|
Chemical Test |
Observation | Conclusion |
| To Solution X, ammonium hydroxide is added in minium quantity first and then in excess | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
| To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess | A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution | (ii) |
| To solution W, A small quantity of sodium hydroxide solution is added and then in excess | A white precipitate is formed which remains insoluble | (iii) |
| To a salt Z, calcium hydroxide solution is added and then heated | A pungent smelling gas turning moist red litmus paper blue is obtained | (iv) |
Write a balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
The metal hydroxide which reacts with both acids and alkalis to form salt and water is ______.
A ______ coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.
