JEE Mains · Chemistry · STD 12 - 3. Chemical kinetics

For the reaction \(\mathrm{A} \rightarrow\) products.

The concentration of A at 10 minutes is _______ \(\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}\) (nearest integer). The reaction was started with \(2.5 \mathrm{~mol} \mathrm{~L}^{-1}\) of A.

A 2435
B 2400
C 2541
D 1254

Verified Solution

Answer & Solution

Correct Answer

(A) 2435

Step-by-step Solution

Detailed explanation

\begin{aligned} & \mathrm{t}_{1 / 2} \propto[\mathrm{A}]_0 \Rightarrow \text { Order }=\text { zero } \\ & \mathrm{t}_{1 / 2}=\frac{\mathrm{A}_0}{2 \mathrm{~K}} \Rightarrow \text { Slope }=\frac{1}{2 \mathrm{~K}}=76.92 \\ & \mathrm{~K}=\frac{1}{2 \times 76.92} \\ &…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List \(-I\) with List \(- II\)

List \(- I\) Electronic configuration of elements	List \(- II\) \(\Delta_{ i }\) in \(kJ\, mol-1\)
\((a)\) \(1 s ^{2} 2 s ^{2}\)	\((i)\) \(801\)
\((b)\) \(1 s ^{2} 2 s ^{2} 2 p ^{4}\)	\((ii)\) \(899\)
\((c)\) \(1 s^{2} 2 s^{2} 2 p^{3}\)	\((iii)\) \(1314\)
\((d)\) \(1 s ^{2} 2 s ^{2} 2 p ^{1}\)	\((iv)\) \(1402\)

Choose the most appropriate answer from the options given below

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Match List - I with List - II.

List - \(I\) (Compound)	List - \(II\) (Use)
\((A)\) Carbon tetrachloride	\((I)\) Paint remover
\((B)\) Methylene chloride	\((II)\) Refrigerators and air conditioners
\((C)\) DDT	\((III)\) Fire extinguisher
\((D)\) Freons	\((IV)\) Non Biodegradable insecticide

Choose the correct answer from the options given below:

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The correct stability order of the following resonance structures of \(\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}\) is _______.

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For the reaction \(\mathrm{A} \rightarrow\) products.The concentration of A at 10 minutes is _______ \(\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}\) (nearest integer). The reaction was started with \(2.5 \mathrm{~mol} \mathrm{~L}^{-1}\) of A.

Step-by-step Solution

For the reaction \(\mathrm{A} \rightarrow\) products.

The concentration of A at 10 minutes is _______ \(\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}\) (nearest integer). The reaction was started with \(2.5 \mathrm{~mol} \mathrm{~L}^{-1}\) of A.