• # question_answer Why reaction between $NaCl$ and $AgN{{O}_{3}}$ is very fast but reaction between ${{H}_{2}}$ and $C{{l}_{2}}$ is slow?

$NaCl$and $AgN{{O}_{3}}$ are ionic compounds. In solution, $NaCl$ gives $N{{a}^{+}}$ and $C{{l}^{-}}$ ions and $AgN{{O}_{3}}$ gives $A{{g}^{+}}$and $NO_{3}^{-}$ ions. The oppositely charged $A{{g}^{+}}$ and $C{{l}^{-}}$ ions combine immediately. The reaction between ${{H}_{2}}$and $C{{l}_{2}}$ involves breaking of covalent bonds which requires energy.