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MAH-MHT CET (PCM/PCB)
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पाठ्यक्रम

Rate of Reactions

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Maharashtra State Board: Class 12

Definition: Rate of Reactions

The rate of change of concentration of either products or reactants per unit time is termed the rate of reaction.

Reactants ⟶ Products

Maharashtra State Board: Class 12

Definition: Average Rate

It is the ratio of the total change in concentration of a reactant or product to the total time taken by the reaction.

\[r_{\mathrm{av}}=-\frac{\Delta[R]}{\Delta t}=+\frac{\Delta[P]}{\Delta t}\]

Maharashtra State Board: Class 12

Definition: Instantaneous Rate

The rate of a reaction at any instant of time is called the instantaneous rate of reaction. It is equivalent to the small change in concentration (dx) in a small interval of time (dt).

Instantaneous rate of reaction,

\[r_{\mathrm{inst}}=\frac{-dx}{dt}\]

Related QuestionsVIEW ALL [12]

Answer the following in one or two sentences.

For the reaction,

\[\ce{N2_{(g)} + 3H2_{(g)} -> 2NH3_{(g)}}\],

what is the relationship among `("d"["N"_2])/"dt"`, `("d"["H"_2])/"dt"` and `("d"["NH"_3])/"dt"`?

In the reaction A + 3B → 2C, the rate of formation of C is ______.

Define the rate of a reaction.

Explain factors affecting the rate constant of a chemical reaction.

For the reaction, \[\ce{3I^-(aq) + S2O^2-_8(aq) -> I^-_3(aq) + 2SO^2-_4(aq)}\]

`(d[SO_4^(2-)])/dt = 2.2 xx 10^(-2)` M/s at a particular time.

Calculate `(a) -(d[I^-])/dt   (b) -(d[S_2O_8^(2-)])/dt   (c) (d[I_3^-])/dt`

For the reaction,

\[\ce{2NO(g) + O2(g) -> 2NO2(g) ->[d(NO2)][dt] = 0.052 mol dm^{-3} s^{-1}}\]

Calculate rate of consumption of NO (g).

Rate constant for the reaction \[\ce{2N2O5 -> 4NO2 + O2}\] is 4.98 × 10–4 s–1. Find the order of reaction?

Explain the term instantaneous rate of a reaction.

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