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प्रश्न
Ammonia solution in water gives a blue precipitate when it combines with a solution of copper salt. The blue precipitate further dissolves in excess of an ammonia solution to give the azure blue solution. Explain with the equation.
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उत्तर
When ammonia (NH3) is added to water, it forms ammonium hydroxide (NH4OH).
\[\ce{NH3 + H2O <=> NH4OH}\]
Copper (II) sulphate (CuSO4) reacts with ammonium hydroxide to form a pale blue precipitate of copper (II) hydroxide (Cu(OH)2).
\[\ce{CuSO4 + 2NH4OH -> \underset{(Pale Blue ppt.)}{(NH4)2SO4} + Cu(OH)2↓}\]
The precipitate is a pale blue colour.
The pale blue precipitate of Cu(OH)2 dissolves in excess ammonium hydroxide to form a deep blue (azure) solution of tetraammine copper (II) sulphate.
\[\ce{Cu(OH)2 + 4NH4OH -> [Cu(NH3)4]SO4 + 4H2O}\]
The product is a deep blue complex ion. [Cu(NH3)4]2+ known as tetraammine copper (II).
The deep blue coloration confirms the formation of this complex.
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संबंधित प्रश्न
State one relevant observation for the following
When ammonia gas is burnt in an atmosphere of excess oxygen.
Identify the substance underlined:
The organic compound which when solidified, forms an ice like mass.
Name the following
Ammonium salt used in explosive.
Copy and complete the following equations :
(i) Mg3N2 + 6H2O →
(ii) 2NH3 + 3CuO →
(iii) 8NH3 + 3Cl2 →
(iv) 4NH3 + 5O2 →
Look at the following reaction :
A. Nitrogen + metal → compound X
B. X + water → ammonia + another compound
C. Ammonia + metal oxide → metal + water + N2
(i) One metal that can be used for reaction in A is magnesium.
(a) Write the formula of the compound X, that is formed.
(b) Write the balanced equation for reaction B, where Xis the compound formed.
( c) Which property of ammonia is demonstrated by reaction C?
An element has 2 electrons in its N shell. It reacts with a non-metal of atomic number 7. The compound formed reacts with warm water and produces a basic gas. Identify the elements and write a balanced chemical reaction.
The catalyst used in the oxidation of ammonia is ______.
