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What is zero order reaction? Give an example? and What is a pseudo first order reaction or pseudo unimolecular reaction

What is zero order reaction? Give an example?

and
What is a pseudo first order reaction or pseudo unimolecular reaction
 
 

Grade:12

3 Answers

vamshi
199 Points
5 years ago
The Reaction in which rate of the reaction is independent of the concentration of the reacting
substances is called zero order reaction.
E.g. Decomposition of ammonia gas on hot platinum surface
2NH3 (g) ⎯⎯ N2 (g) + 3H2 (g) ,

Rate = k [NH3]o
 
 
A First order reaction with molecularity two is called a pseudo first order reactions or pseudo
unimolecular reaction.
Ex; Acid catalysed hydrolysis of ethyl acetate is a pseudo first order reaction, because water is
taken large in excess and hence ethyl acetate is said to be isolated.
+
H
CH3COOC2H5 + H2O ⎯⎯→ CH3COOH + C2H5OH
Rate of the reaction, rate = k [CH3COOC2H5]
Its molecularity is 2 but the order of reaction is 1.
 
T.kumar
281 Points
5 years ago
The Reaction in which rate of the reaction is independent of the concentration of the reacting
substances is called zero order reaction.
E.g. Decomposition of ammonia gas on hot platinum surface
2NH3 (g) ⎯⎯ N2 (g) + 3H2 (g) ,

Rate = k [NH3]o
 
 
A First order reaction with molecularity two is called a pseudo first order reactions or pseudo
unimolecular reaction.
Ex; Acid catalysed hydrolysis of ethyl acetate is a pseudo first order reaction, because water is
taken large in excess and hence ethyl acetate is said to be isolated.
+
SAI SARDAR
1700 Points
5 years ago
Srinivas, A chemical reaction in which the rate of reaction is constant and independent of the concentration of the reacting substances.

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