NEET · Chemistry · STD 12 - 3. Chemical kinetics
A first order reaction has a specific reaction rate of \(10^{-2}\,sec^{-1}.\) How much time will it take for \(20\, g\) of the reactant to reduce to \(5\, g\,?\) ........ \(\sec\)
- A \(138.6\)
- B \(346.5\)
- C \(693.0\)
- D \(238.6\)
Answer & Solution
Correct Answer
(A) \(138.6\)
Step-by-step Solution
Detailed explanation
\(\mathrm{t}=\frac{2.303}{\mathrm{K}} \log \frac{[ \mathrm{A} ]_{\mathrm{o}}}{\left[\mathrm{A}]_{\mathrm{t}}\right.}\) \(\mathrm{t}=\frac{2.303}{10^{-2}} \log \frac{20}{5} \)\(\Rightarrow \mathrm{t}=138.6\, \mathrm{sec}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula \(\text C _4\text H _8\text O\) is :NEET 2025 Easy
- The decomposition of phosphine \((PH_3)\) on tungsten at low pressure is a first-order reaction. It is because theNEET 2016 Medium
- Which one is the correct order of acidity ?NEET 2017 Hard
- Some \(meta-\) directing substituents in aromatic substitution are given. Which one is most deactivating?NEET 2013 Hard
- The stability of \(Cu ^{2+}\) is more than \(Cu ^{+}\)salts in aqueous solution due to -NEET 2023 Medium
- For a first order reaction \(A \rightarrow\) Products, initial concentration of \(A\) is \(0.1\, M\), which becomes \(0.001 \,M\) after \(5\) minutes. Rate constant for the reaction in \(\min ^{-1}\) is .... .NEET 2022 Medium
More PYQs from NEET
- A parallel plate capacitor has a uniform electric field ' \(\overrightarrow{\mathrm{E}}\) ' in the space between the plates. If the distance between the plates is ' \(\mathrm{d}\) ' and the area of each plate is ' \(A\) ', the energy stored in the capacitor is : \(\left(\varepsilon_{0}=\right.\) permittivity of free space)NEET 2021 Medium
- Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.NEET 2017 Medium
- The dimensions \(\left[ MLT ^{-2} A ^{-2}\right]\) belong to the :NEET 2022 Medium
- The efficiency of a Carnot engine depends uponNEET 2020 Easy
- The intensity at the maximum in a Young's double slit experiment is \(I_0\). Distance between two slits is \(d = 5\lambda,\) where \(\lambda\) is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance \(D = 10\,d\,?\)NEET 2016 Hard
- The number of sigma ( \(\sigma\) ) and pi ( \(\pi\) ) bonds in pent\(- 2 -\)en\(- 4 -\)yne isNEET 2019 Medium