WBJEE · Chemistry · Chemical Kinetics
The half-life for decay of \({ }^{14} \mathrm{~C, by~} \beta\) -emission is \(5730 \mathrm{yr}\). The fraction of \({ }^{14} \mathrm{C}\) decays, in a sample that is 22920 yr old, would be
- A \(\frac{1}{8}\)
- B \(\frac{1}{16}\)
- C \(\frac{7}{8}\)
- D \(\frac{15}{16}\)
Answer & Solution
Correct Answer
(D) \(\frac{15}{16}\)
Step-by-step Solution
Detailed explanation
\(n=\frac{\text { total time }(t)}{\text { half -lite }(t / 2)}=\frac{22920}{5730}=4\)…
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
- The conductivity measurement of a coordination compound of cobalt (III) shows that it dissociates into 3 ions in solution. The compound isWBJEE 2019 Hard
- Dissolving NaCN in de-ionised water will result in a solution havingWBJEE 2017 Easy
- \[
\text { The two structures written below represent }
\]
WBJEE 2009 Medium - The exact order of boiling points of the compounds \(\mathrm{n}\)-pentane, isopentane, butanone and 1 -butanol isWBJEE 2021 Medium
- The equilibrium constant for the reaction \(\mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})\) is \(4 \times 10^{-4}\) at \(2000 \mathrm{~K}\). In presence of a catalyst the equilibrium is attained 10 times faster. Therefore, the equilibrium constant, in presence of the catalyst at \(2000 \mathrm{~K}\) isWBJEE 2021 Easy
- 1,4 -dimethylbenzene on heating with anhydrous \(\mathrm{AlCl}_{3}\) and HCl producesWBJEE 2015 Medium
More PYQs from WBJEE
- Oxidation states of \(\mathrm{Cr}\) in \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and \(\mathrm{CrO}_5\) are, respectivelyWBJEE 2022 Easy
- Of the following compounds the most acidic isWBJEE 2009 Easy
- For positive integer \(n, n^{3}+2 n\) is always divisible byWBJEE 2016 Easy
- In the following sequence of reaction compound M is
\(\mathrm{M} \xrightarrow{\mathrm{CH}_3 \mathrm{MgBr}} \mathrm{N}+\mathrm{CH}_4 \uparrow \xrightarrow{\mathrm{H}^{+}} \mathrm{CH}_3 \mathrm{COCH}_2 \mathrm{COCH}_3\)WBJEE 2024 Medium - Li occupies higher position in the electrochemical series of metals as compared to Cu sinceWBJEE 2012 Easy
- If three positive real numbers \(a, b, c\) are in A.P. and \(a b c=4\) then minimum possible value of \(b\) isWBJEE 2009 Medium