CBSE 2025 Β· Region 2 Β· Set 1 Β· Q17 Β· 2 marks
The rate constant for a zero order reaction A β P is $\displaystyle 0.0030 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$. How long will it take for the initial concentration of A to fall from $\displaystyle 0.10$ M to $\displaystyle 0.075$ M ?The decomposition of $\displaystyle \mathrm{NH}_{3}$ on platinum surface is zero order reaction. What are the rates of production of $\displaystyle \mathrm{N}_{2}$ and $\displaystyle \mathrm{H}_{2}$ if $\displaystyle \mathrm{k}=2.5 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ ?
The rate constant for a zero order reaction A β P is $\displaystyle 0.0030 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$. How long will it take for the initial concentration of A to fall from $\displaystyle 0.10$ M to $\displaystyle 0.075$ M ?
The decomposition of $\displaystyle \mathrm{NH}_{3}$ on platinum surface is zero order reaction. What are the rates of production of $\displaystyle \mathrm{N}_{2}$ and $\displaystyle \mathrm{H}_{2}$ if $\displaystyle \mathrm{k}=2.5 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ ?
Marking-scheme solution
Rate =
βπ β[π΅π―π]
π βπ =
β[π΅π]
βπ =
+$\displaystyle 1$ β[π―π]
π βπ
βπ β[π΅π―π]
π βπ =
β[π΅π]
βπ =
+ π β[π―π]
π βπ = k
β[π΅π]
βπ = $\displaystyle 2.5$ x $\displaystyle 10$-$\displaystyle 4$ mol L-$\displaystyle 1$ s-$\displaystyle 1$
β[π―π]
βπ = $\displaystyle 3$ x $\displaystyle 2.5$ x $\displaystyle 10$-$\displaystyle 4$
= $\displaystyle 7.5$ x $\displaystyle 10$-$\displaystyle 4$ mol L-$\displaystyle 1$ s-$\displaystyle 1$
Chemical KineticsIntegrated Rate EquationsApplyvery_short_answereasy
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSEβs own marking scheme gives it. Where our answers come from.