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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 giving an example.
Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution.
- What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
- Write the balanced chemical equation for the reaction which takes place.
- State the physical conditions of reactants in which the reaction will not take place.
- Name the type of chemical reaction which occurs.
- Give one example of another reaction which is of the same type as the above reaction.
The aqueous solutions of copper sulphate and zinc sulphate appear
(A) blue and green respectively
(B) green and colourless respectively
(C) blue and brown respectively
(D) blue and colourless respectively.
(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
(ii) What type of reaction is this?
(iii) Write a balanced chemical equation to represent the above reaction.
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a:
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
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?
Balance the following chemical equation and identify the type of chemical reaction.
`"TiCl"_4("l") + "Mg"("s") -> "Ti"("s") + "MgCl"_2("s")`
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?
