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प्रश्न
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, l, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of white gelatinous precipitate obtained?
उत्तर
(a) Zinc (Zn ) metal salt solution was used.
(b) The formula of white gelatinous precipitate is Zn(OH)2.
Concept Insight :
\[\ce{\underset{\text{Colourless}}{ZnSO4} + 2NH4OH ->\underset{\text{White ppt.}}{Zn(OH)2} + (NH4)2SO4}\]
With excess of NH4OH the oreciojtate of zinc(II) hydroxide dissolves as:
\[\ce{Zn(OH)2 +\underset{\text{In excess}}{(NH4)2SO4 + 2NH4OH} ->\underset{\text{Tetrammine zinc(II)Sulphate(Colourless solution)}}{[Zn(NH3)4]SO4}+ 4H2O}\]
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संबंधित प्रश्न
Write the probable colour of the following salt:
Ammonium salts
Write the probable colour of the following salt:
Cupric salts
Write the probable colour of the following salt:
Calcium salts
Name the probable cation present in each of the following solution:
Light blue coloured solution
Name the probable cation present in each of the following solution:
Pink coloured solution
Write the colour of the following salt : Cupric salts.
A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colorless solution.
Fill in the blanks.
Salts of ______ [normal / transition] elements are generally coloured. From the ions K1+, Cr3+, Fe2+, Ca2+, \[\ce{SO^2-_3}\], \[\ce{Mn^1-_4}\],\[\ce{NO^1_3}\] the ions generally coloured are ______.
Write balanced equation for the following reaction:
Chlorine and cold dilute sodium hydroxide solution.
Name :
a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
