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The concentration dependence of the rate of a reaction is called the differential rate equation. It is not always convenient to determine the instantaneous rate, as it is measured by calculating the slope of the tangent at point 't' in the concentration vs time plot. This makes it difficult to determine the rate and hence the order of the reaction. This difficulty is overcome by integrating the differential rate equation. This integrated rate equation gives a direct relation between concentrations at different times and the rate constant. The integrated rate equations are different for the reactions having different reaction orders.
The rate constant of a reaction is 2.1 mol L-'s-¹. What is the order of the reaction?

Question

Accepted Answer

(A) Zero order

Answer

(B) First order

Answer

(C) Secondorder

Answer

(D) Third order

List-l (Complex)	List-II (Property)
(A) Fuel Cell	(I) Anode: \(Zn (s) \rightarrow Zn ^{2+}+2 e^{-}\) Cathode: \(MnO _2+ NH _4^{+}+e^{-} \rightarrow MnO ( OH )+ NH _3\)
(B) A secondary cell	(II) Cathode: \(O _2(g)+2 H _2 O (l)+4 e^{-} \rightarrow 4 OH ^{-}(a q)\) Anode: \(2 H _2(g)+4 OH ^{-}(a q) \rightarrow 4 H _2 O (l)+4 e^{-}\)
(C) Mercury cells	(III) \(Pb (s)+ PbO _2(s)+2 H _2 SO _4(a q) \rightarrow 2 PbSO _4(s)+2 H _2 O (l)\)
(D) Leclanche cell (Simplified)	\((I V) Zn ( Hg )+ HgO (s) \rightarrow ZnO (s)+ Hg (l)\)

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