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What is Zero Order reaction ?...

What is Zero Order reaction ?

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Order of reaction : The sum of the powers of the oncentration, terms of the reactants in the rate law expression is called order of reaction.
Molecularity of reaction: The number of reacting species (atoms, ions or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction is collide molecularity of a reaction.
Differences between order and molecularity:

Example for first order reaction ` : N_(2) O_(s) (g) to 2 NO_(2) ( g) + 1//2 O_(2) ( g)`
Example for second order reation ` : 2 H l to H_(2) + l_(2)`
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