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Physical Chemistry -- Nuclear Chemistry
21.
As the mass number A increases, the binding energy per nucleon of the
nucleus
- A.decreases
- B.varies in a way that depends upon the actual value of A
- C.remains unchanged
- D.increases
- Answer
- Report
Answer : [B]
22.
During a nuclear fission reaction
- A.a heavy nucleus bombarded by thermal neutrons, splits
- B.two light nuclei combine to give a heavier nucleus
- C.a heavy nucleus splits into two fragments by itself
- D.a light nucleus bombarded by thermal neutrons, splits
- Answer
- Report
Answer : [A]
23.
Two deuterium nuclei in a deuterium vapour state at room temperature
do not combine to form a helium nucleus because
- A.He2+ nucleus is unstable
- B.coulombic repulsion does not allow the nuclei to come close together
- C.a deuterium nucleus is more tightly bound than a helium nucleus
- D.it is not energetically favourable
- Answer
- Report
Answer : [B]
24.
A heavy nucleus has larger N/Z ratio because
- A.a neutron has large mass compared to a proton and an electron
- B.mean life of neutron is greater than that of a proton
- C.a neutron exerts electric repulsion
- D.the nucleus has larger number of neutrons
- Answer
- Report
Answer : [D]
25.
During nuclear fission, the final state has lesser energy than the reactant.
The nuclear reaction takes place even though intermediate state has
greater energy than the initial one and no energy is supplied externally.
This process is called
- A.barrier penetration
- B.tunnelling
- C.formation of compound nucleus
- D.binding energy
- Answer
- Report
Answer : [A]
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