is a beta active nucleus. A sample of gas kept in a closed vessel shows increase in pressure with ti — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

$\text{C}^{14}$ decays via $\beta$-emission to $\text{N}^{14}$. Consequently, $\text{C}^{14}\text{H}_4$ molecules are converted into $\text{N}^{14}\text{H}_4^+$, which is unstable and dissociates into $\text{N}^{14}\text{H}_3$ and $\text{H}^+$, ultimately forming $\text{H}_2$ gas. This increases the total number of moles of gas, increasing the pressure. Therefore, correct answer is A.