Advertisements
Advertisements
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?
Advertisements
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:
\[\ce{Zn(OH)2 +\underset{\text{In excess}}{(NH4)2SO4 + 2NH4OH} ->\underset{\text{Tetrammine zinc(II)Sulphate(Colourless solution)}}{[Zn(NH3)4]SO4}+ 4H2O}\]
APPEARS IN
संबंधित प्रश्न
Write the probable colour of the following salt:
Calcium salts
Write the probable colour of the following salt:
Potassium nitrate
Name the probable cation present in each of the following solution:
Light blue coloured solution
Write the colour of the following salt : Ferrous salts.
Write the colour of the following salt : Ferric salts.
One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Sodium sulphate solution and sodium chloride solution.
Write balanced equation for the following reaction:
Iron(II) chloride solution with sodium hydroxide solution.
Write the observation, and balanced equation for the following reaction:
Moist starch iodide paper is placed at the mouth of a test tube containing chlorine gas.
Name :
a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is ______.
