# JEE Main & Advanced Chemistry Chemical Kinetics Types Of Chemical Reactions

Types Of Chemical Reactions

Category : JEE Main & Advanced

On the basis of reaction rates, the chemical reactions have been classified into the following three types,

(1) Very fast or instantaneous reactions : These reactions occur at a very fast rate generally these reactions involve ionic species and known as ionic reactions. It is almost impossible to determine the rates of these reactions.

Examples

(i) $AgN{{O}_{3}}+NaCl\to \underset{\text{(PPt}\text{.)}}{\mathop{AgCl}}\,+NaN{{O}_{3}}$ (Precipitation reaction)

(ii) $\underset{\text{(acid)}}{\mathop{HCl}}\,+\underset{\text{(base)}}{\mathop{NaOH}}\,\to \underset{\text{(Salt)}}{\mathop{NaCl}}\,+{{H}_{2}}O$  (Neutralization reaction)

(2) Moderate reaction : These reactions proceed with a measurable rates at normal temperature and it is these reactions are studied in chemical kinetics. Mostly these reactions are molecular in nature.

Examples

(i) Decomposition of ${{H}_{2}}{{O}_{2}}$: $2{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{O}_{2}}$

(ii) Decomposition of ${{N}_{2}}{{O}_{5}}$: $2{{N}_{2}}{{O}_{5}}\to 2{{N}_{2}}{{O}_{4}}+{{O}_{2}}$

(3) Very slow reactions : These reactions are extremely slow and take months together to show any measurable change.

Examples

(i) Rusting of iron : $F{{e}_{2}}{{O}_{3}}+x{{H}_{2}}O\to \underset{\text{Hydrated ferric oxide (Rust)}}{\mathop{F{{e}_{2}}{{O}_{3}}.\,x{{H}_{2}}O}}\,$

(ii) $2{{H}_{2}}+{{O}_{2}}\xrightarrow{\text{Room temperature}}2{{H}_{2}}O$

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