Question Bank [2022] — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryQuestion Bank [2022]2 Marks
Question
Write four key points about order of reaction.
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Answer
1. The order of a chemical reaction is experimentally determined.
2. The order can be integer or fractional. Look at the reaction, $ CH _3 CHO _{( g )} \longrightarrow CH _{4( g )}+ CO _{( g )} $ The rate law for the reaction was found to be rate $= k \left[ CH _3 CHO \right]^{3 / 2}$. Here, the order of the reaction is $3 / 2$.
3. The order of the reaction can be zero for: $ NO _{2( g )}+ CO _{( g )} \longrightarrow NO _{( g )}+ CO _{2( g )} $ The rate expression for this is: rate $=k\left[ NO _2\right]^2$. This shows that the order of reaction with respect to $NO _2$ is 2 and with $CO$ is zero or the rate is independent of the concentration of $CO$. The overall order of the reaction is 2
4. Only a few reactions of third-order are known. Reactions with orders higher than three are scanty.
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