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Nuclear Chemistry
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Nuclear Chemistry
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15 Questions

1. Carbon - 14 dating metho(d)is base(d)on the fact that: [1997]
2. When (a)radioactive element emits successively one alpha-particleand two beetaparticles - the mass number of the daughter element [1999]
3. One microgram of radioactive sodium Na 24/11 with (a)half-life of 15 hours was injected into (a)living system for (a)bio-assay. How long will it take for the radioactive subtance to fall up to 25% of the initial value? [1996]
4. Number of neutrons in (a)parent nucleus X - which gives 14/7 N nucleus - after two successive Eemissions - would be [1998]
5. Ahuman body require(d)0.01Mactivity of radioactive substance after 24 hours. Half life of radioactive substance is 6 hours. Then injection of maximum activity of radioactive substance that can be injecte(d)will be [2001]
6. When (a)radioactive element emits successively one alpha-particleand two beetaparticles - the mass number of the daughter element [1999]
7. If an isotope of hydrogen has two neutrons in its atom - its atomic numberand atomic mass number will respectively be [1992]
8. Number of neutrons in (a)parent nucleus X - which gives 14/7 N nucleus - after two successive Eemissions - would be [1998]
9. Emission of an alph(a)particle leads to a [1989]
10. The radioactive isotope 60/27 Co which isused in the treatment of cancer can be made by(n - p) reaction. For this reaction the target nucleus is
11. One microgram of radioactive sodium Na 24/11 with (a)half-life of 15 hours was injected into (a)living system for (a)bio-assay. How long will it take for the radioactive subtance to fall up to 25% of the initial value? [1996]
12. In (a)radioactive decay - an emitte(d)electron comes from [1994]
13. In (a)radioactive decay - an emitte(d)electron comes from [1994]
14. Half-life for radioactive 14C is 5760 years. In how many years - 200 mg of 14C will be reduced to 25 mg? [1995]
15. The radioactive isotope - tritium - (3/1H) has(a) halflife of 12.3 years. If the initial amount of tritium is 32 mg - how many milligrams of it would remain after 49.2 years? [2003]

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