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प्रश्न
Explain the following type of chemical reaction, giving two examples for it:
Double displacement reaction
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उत्तर
A chemical reaction in which two compounds in their aqueous state exchange their ions to form new compounds is called a double decomposition reaction.
Examples:
- When barium chloride solution reacts with sodium sulphate solution, a white precipitate of barium sulphate and a soluble salt, sodium chloride, are obtained.
\[\ce{\underset{chloride]}{\underset{[barium]}{BaCl2_{(aq)}}} + \underset{[Sodium sulphate]}{Na2SO4_{(aq)}} -> \underset{[Barium sulphate]}{BaSO4 \downarrow} + \underset{[Sodium chloride]}{2NaCl_{(aq)}}}\] - Zinc oxide, a base, reacts with nitric acid to form a salt, zinc nitrate. and water.
\[\ce{\underset{[Zinc oxide]}{ZnO_{(s)}} + \underset{[Nitric acid]}{2HNO3_{(aq)}} + \underset{[Water]}{H2O}}\]
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संबंधित प्रश्न
What do you mean by a precipitation reaction? Explain by giving examples.
What type of reaction is represented by the following equation?
CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4
Consider the reaction:
KBr (aq) + AgNO3 (aq) → KNO3 (aq) + AgBr (s)
This is an example of:
(a) decomposition reaction
(b) combination reaction
(c) double displacement reaction
(d) displacement reaction
Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observe in
(A) I and II
(B) II and III
(C) III and I
(D) All the three
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
List two types of reactions in which this reaction can be placed.
Classify the following reaction into –
- Direct combination
- Decomposition
- Displacement
- Double decomposition
The reaction is – Zinc sulphate reacts with ammonium hydroxide to give ammonium sulphate and zinc hydroxide.
The following reaction is an example of:
\[\ce{4NH3_{(g)} + 5O2_{(g)} -> 4NO_{(g)} + 6H2O_{(g)}}\]
(i) displacement reaction
(ii) combination reaction
(iii) redox reaction
(iv) neutralisation reaction
Which option denotes a double displacement reaction?
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
