Paper: CSIR-NET June 2014 · Subject: Inorganic Chemistry · Chapter: Nuclear Chemistry · Topic: Nuclear Reactions Q Value · Marks: 2 · Difficulty: Medium
For a low energy nuclear reaction, ${ }^{24} \mathrm{Mg}(\mathrm{d}, \alpha)^{22} \mathrm{Na}$, the correct statements from the following are
(a)Kinetic energy of d particle is not fully available for exciting $^{24}\mathrm{Mg}$.
(b)Total number of protons and neutrons is conserved
(c)Q value of nuclear reaction is much higher in magnitude relative to heat of chemical reaction
(d)Threshold energy is $\leq$ Q value.
Answer
Answer: A ✓ checked by 4AB · confidence high
Answer: (a), (b) and (c).
Explanation
Answer: (a), (b) and (c) — Part of the deuteron's kinetic energy goes into centre-of-mass motion, the nucleon number is conserved, and nuclear Q-values (MeV) far exceed chemical heats. For an endoergic reaction the threshold is greater than |Q|.