Equilibrium and Dynamic Equilibrium

Irreversible reaction :

They proceed in only one direction
Ex 1 : Neutralization Reaction
HCl + NaOH \rightarrow NaCl + H_{2}O
Ex 2 : Precipitation Reaction 
AgNO_{3} + NaCl \rightarrow AgCl\downarrow + NaNO_{3}(aq)
Pb(NO_{3})_{2} + H_{2}SO_{4} \rightarrow PbSO_{4}\downarrow + 2HNO_{3}

Reversible reaction :

 It is denoted by \rightleftharpoons
ex : H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}
PCl_{5(g)} \rightleftharpoons PCl_{3} + Cl_{2(g)}
2SO_{2(g)} + O_{2(g)} \rightleftharpoons 2SO_{3(g)}

View the Topic in this Video from 0:10 to 6:33

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