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प्रश्न
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
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उत्तर १
Displacement reaction: In a displacement reaction, a more reactive element replaces a less reactive element from a compound.
\[\ce{Zn_{(s)} + CuSO4_{(aq)} -> ZnSO4_{(aq)} + Cu_{(s)}}\]
Double displacement reaction: In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds.
Example: in the reaction between barium chloride and sulphuric acid, barium chloride exchanges its Cl− ions with \[\ce{SO^{2-}4}\] ions of H2SO4.
\[\ce{BaCl2_{(aq)} + H2SO4_{(aq)} -> BaSO4_{(s)} + 2HCl_{(aq)}}\]
उत्तर २
| Sr. No. | Displacement Reaction | Double Displacement Reaction |
| 1. | A displacement reaction is a chemical reaction in which a metal is displaced from its solution by another more reactive metal than the metal being displaced. | A double displacement reaction is a chemical reaction in which ions are exchanged between both reactants. |
| 2. | Example: \[\ce{Zn + CuSO4 -> ZnSO4 + Cu}\] Here, Zinc (Zn), which is more reactive than Cu, displaces copper from its solution. | Example: \[\ce{Na2SO4 + BaCl2 -> BaSO4 + 2NaCl}\] Here, both Na2SO4 and BaCl2 exchange their ions. |
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संबंधित प्रश्न
Give an example of a double displacement reaction other than the one given in the following Activity.
•Take about 3 mL of sodium sulphate
solution in a test tube.
• In another test tube, take about 3 mL of
barium chloride solution.
• Mix the two solutions given in the following fig.
• What do you observe?
What type of chemical reaction is represented by the following equation?
\[\ce{PQ + RS -> PS + RQ}\]
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 along with 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.
- What is metal X?
- What is salt XNO3?
- Name the compound Y.
- 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.
- 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.
Explain the following type of chemical reaction, giving two examples for it:
Double displacement 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.
Choose and write the correct option.
What is the type of the following reaction?
BaCl2 + ZnSO4 → BaSO4 + ZnCl2
If sodium chloride is added to the silver nitrate solution:
a. which precipitate is formed?
b. name the type of reaction.
c. write the chemical equation.
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?
Which among the following is (are) double displacement reaction(s)?
(i) \[\ce{Pb + CuCl -> PbCl2 + Cu}\]
(ii) \[\ce{Na2SO4 + BaCl2 -> BaSO4 + 2NaCl}\]
(iii) \[\ce{C + O2 -> CO2}\]
(iv) \[\ce{CH4 + 2O2 -> CO2 + 2H2O}\]
Balance the following chemical equation and identify the type of chemical reaction.
`"TiCl"_4("l") + "Mg"("s") -> "Ti"("s") + "MgCl"_2("s")`
A chemical reaction in which exchange of ions occurs between the reactants is known as ______.
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.
Give an example of a double displacement reaction.
