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Question
Explain the following type of chemical reaction, giving two examples for it:
Double displacement reaction
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Solution
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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RELATED QUESTIONS
What is meant by double displacement reaction? Explain with help of one example.
A metal X forms a water soluble salt XNO3. When an aqueous solution of XNO3 is added to common salt solution, then a white precipitate of compound Y is formed alongwith sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrohloric acid.
(a) What is metal X?
(b) What is salt XNO3?
(c) Name the compound Y.
(d) Write the chemical equation of the reaction which takes place on reacting XNO3 solution and common salt solution giving the physical states of all the reactants and products.
(e) What type of chemical reaction is illustrated by the above equation?
Fill in the blank
In the type of reaction called ....................................., ions two compounds exchange their positive and negative radicals ions respectively.
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
In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
- exchange of atoms takes place
- exchange of ions takes place
- a precipitate is produced
- an insoluble salt is produced
The correct option is:
Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.
Differentiate between displacement reaction and a neutralization reaction.
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
Add potassium chromate (K2CrO4) into the solution of barium sulphate (BaSO4).
- What was the colour of the precipitate formed? Also, write the name of the precipitate.
- Write down the balanced equation for this reaction.
- Will you call this reaction a displacement reaction or a double displacement reaction? Why?
Identify the product which represents the solid state in the above reaction.
