COMEDK · Chemistry · 19. Chemical Kinetics
A wooden box excavated from Indus valley had an activity of \(1.18 \times 10^{13}\) disintegration per minute per \(g\) of carbon. What is the approximate age of this civilisation?
- A \(4000\) years
- B \(5700\) years
- C \(8100\) years
- D \(6000\) years
Answer & Solution
Correct Answer
(C) \(8100\) years
Step-by-step Solution
Detailed explanation
\begin{aligned} \frac{d N}{d t} &=\lambda N \\ \frac{d N}{d t} &=\frac{1}{T} \frac{6.023 \times 10^{23}}{12} \\ T &=\frac{6.023 \times 10^{23}}{12 \times 1.18 \times 10^{13}} \quad\left\{\frac{d N}{d t}=1.18 \times 10^{13}\right\} \\ &=42530 \times 10^{6} \mathrm{~min} \\…
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
- If 2 moles of \(\mathrm{C}_6 \mathrm{H}_6(\mathrm{~g})\) are completely burnt \(4100 \mathrm{~kJ}\) of heat is liberated. If \(\Delta H^{\circ}\) for \(\mathrm{CO}_2(\mathrm{~g})\) and \(\mathrm{H}_2 \mathrm{O}(l)\) are \(-410\) and \(-285 \mathrm{~kJ}\) per mole respectively then the heat of formation of \(\mathrm{C}_2 \mathrm{H}_6(g)\) isCOMEDK 2023 Medium
- Presence of halogen in organic compounds can be detected usingCOMEDK 2020 Easy
- An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will beCOMEDK 2020 Hard
- An electron having spin quantum number of \(s=\frac{-1}{2}\) and magnetic quantum number, \(m=+3\) can be present inCOMEDK 2012 Medium
- Two ions \(A^{+}\)and \(B^{-}\)have radii 104 and 200 pm respectively, in a cubic close packed crystal of compound \(A B\). The coordination number of \(A^{+}\) isCOMEDK 2012 Medium
- Identify the 2 chemical tests which is not answered by Glucose having an open chain structure
[A] Reaction with Schiff's reagent and with Sodium bisulphite
[B] Reaction with \(\mathrm{HCN}\) and with \(\mathrm{HI}\)
[C] Reaction with \(\mathrm{HNO}_3\) and with Acetic anhydride
[D] Reaction with aqueous Bromine and with HydroxylamineCOMEDK 2024 Medium
More PYQs from COMEDK
- In Young's double slit experiment, the separation between two slits is \(0.3 \times 10^{-3} \mathrm{~m}\). When light beam is passed through the two slits, then interference pattern is observed on the screen 1.5 m away. If the first violet and red fringes are formed 2.0 mm and 3.5 mm away from the central white fringe, then the difference in wavelength of red and violet light is \(x \times 10^{-9} \mathrm{~m}\). The value of \(x\) isCOMEDK 2024 Hard
- The adsorption of an inert gases on activated charcoal increase withCOMEDK 2019 Medium
- Which of the following will form a biodegradable polymer?COMEDK 2015 Easy
- Which of the following is the correct sequence of relative acidic strength?COMEDK 2015 Medium
- \((32) \times(32)^{\dfrac{1}{6}} \times(32)^{\dfrac{1}{36}} \times-----\infty \text { is equal to }\)COMEDK 2024 Easy
- \(7^{2 \log _{7} 5}\) is equal toCOMEDK 2020 Easy