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Q.

The equation Ba(OH)2 +2NH4Cl → BaCl2 + 2NH3 + 2H2O is an example of which of the following reaction?


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a

Exothermic reaction

b

Endothermic reaction

c

Double displacement reaction

d

Both 2 and 3 

answer is D.

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Detailed Solution

The equation Ba(OH)2 +2NH4Cl → BaCl2 + 2NH3 + 2H2O is an example of an endothermic and double displacement reaction.
Endothermic reactions are chemical reactions where the reactants absorb the heat from the environment to produce products. These reactions form a cooling effect by lowering the temperature of the surrounding area.
On the other side, reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double replacement reactions, the positive ions exchange with the negative ions. The same process occurs in this reaction.
So, the ammonium chloride and barium hydroxide reactions are endothermic and double displacement reactions.
The reaction is:
Ba(OH)2 +2NH4Cl → BaCl2 + 2NH3 + 2H2O
In this reaction, ammonium chloride is slightly acidic, and barium hydroxide is very basic, so we get an acid-base reaction.
This reaction is used to recover the ammonia to prepare sodium carbonate from sodium chloride.
 
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