differenciate between displacement reaction and double displacement
Answers
(i) A reaction in which one element displaces another element from its compound, is known as displacement reaction.
(ii) In displacement reactions only 'one element' displaces 'another element' from its compound.
Eg: Zn + 2 HCl → ZnCl₂ + H₂
Here, Zn displaces Hydrogen from Hydrochloric acid.
Double displacement reaction:
(i) The reaction in which two compounds react by exchanging their ions to form two new compounds is called double displacement reaction.
(or)
A reaction in which positive and negative radicals of two reactants are exchanged leading to precipitation of a product is called a double displacement reaction.
In double displacement reaction ''Two ions'' exchange their compounds.
Eg : Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2 NaCl.
Here two compounds sodium sulphate and barium chloride react by exchanging their ions to form two new compounds, Barium Sulphate and Sodium Chloride.
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ANSWER :
DISPLACEMENT REACTION :
A single-replacement reaction is a chemical reaction in which one element is substituted for another element in a compound, generating a new element and a new compound as products.
For example,
2HCl(aq)+Zn(s)→ZnCl2(aq)+H2(g)
The hydrogen atoms in HCl are replaced by Zn atoms, and in the process a new element hydrogen is formed.
DOUBLE DISPLACEMENT REACTION:
A double-displacement reaction occurs when parts of two ionic compounds are exchanged, making two new compounds. A characteristic of a double-replacement equation is that there are two compounds as reactants and two different compounds as products.
An example :
CuCl2(aq)+2AgNO3(aq)→Cu(NO3)2(aq)+2AgCl(s)
There are two equivalent ways of considering a double-replacement equation,either the cations are swapped, or the anions are swapped.
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