NEET · Chemistry · STD 12 - 3. Chemical kinetics

The rate constant of the reaction \(A\rightarrow B\) is \(0.6 \times 10^{-3}\, mol\, L^{-1}\, s^{-1}.\) If the concentration of \(A\) is \(5\, M,\) then concentration of \(B\) after \(20\) minutes is ......... \(M.\)

A \(3.60\)
B \(0.36\)
C \(0.72 \)
D \(1.08\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(0.72 \)

Step-by-step Solution

Detailed explanation

For zero order reaction: \(x=K . t\)

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

Given below are two statements :
Statement I : Benzenediazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state.
Statement II : Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with KI. In the light of the above statements, choose the most appropriate answer from the options given below :

NEET 2025 Hard

Match the catalyst with the process

Catalyst	Process
\((i) \;\mathrm{Na}_{2} \mathrm{O}\)	\((a)\) The oxidation of ethyne to ethanal
\((ii) \;\mathrm{TiCl}_{4}+ \mathrm{Al(CH_3)}_{3}\)	\((b)\) Polymerisation of alkynes
\((iii)\;\mathrm{PdCl_2} \)	\((c)\) Oxidation of \(SO_2\) in the manufacture of \(H_2SO_4\)
\((iv)\;\)Nickel complexes	\((d)\) Polymerisation of ethylene

Which of the following is the correct option ?

NEET 2019 Hard

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