NEET AIPMT Chemistry Chapter Wise Solutions – Nuclear Chemistry

NEET AIPMT Chemistry Chapter Wise Solutions – Nuclear Chemistry

NEET AIPMT Chemistry Chapter Wise SolutionsPhysicsBiology

1. A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the α-particles in succession. The group of the periodic table to which the resulting daughter element would belong is (2005)
(a) Gr. 13
(b) Gr. 17
(c) Gr. 14
(d) Gr. 16

2. The radioactive isotope ⁶⁰C₂₇ which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is (2004)

3. The radioisotope, tritium (³H₁) has a half-life 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)
(a) 1 mg
(b) 2 mg
(c) 4 mg
(d) 8 mg

4.

5. A human body required 0.01 m activity 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 injected is (2001)
(a) 0.08
(b) 0.04
(c) 0.16
(d) 0.32

6. If a ^aX_b species emits first a positron, then two a and two b particles and in the last, one a, is also emitted and gets converts to ^cY_d species. So correct relation is (2001)
(a) c = a – 12, d = b – 5
(b) c = a – 5, d = b – 1
(c) c = a – 6, d = b – Q
(d) c = a – 4, d = b – 2

7. A 300 gram radioactive sample at initial half life is 3 hours. After 18 hours remaining quantity (2000)
(a) 4.68 gram
(b) 2.34 gram
(c) 3.34 gram
(d) 9.37 gram

8. Sulphur-35 (34.96903 a.m.u.) emits a β-particle but no γ-ray. The product is chlorine- 35 (34.96885 a.m.u.). The maximum energy emitted by the β-particle is (1999)
(a) 0.16758 MeV
(b) 1.6758 MeV
(c) 16.758 MeV
(d) 0.016758 MeV

9. In the following radioactive decay,

10.

11. Number of neutrons in a parent nucleus X, which gives ¹⁴N₇ nucleus after two successive P emissions, would be (1998)
(a) 7
(b) 6
(c) 9
(d) 8
* Not included in the syllabus of AIPMT since 2006

12. Carbon-14 dating method is based on the fact that (1997)
(a) ratio of carbon-14 and carbon-12 is constant
(b) carbon-14 is the same in all objects
(c) carbon-14 is highly insoluble
(d) all of these.

13.

14. After the emission of one a-particle followed by one β-particle from the atom of ²³⁸X₉₂, the number of neutrons in the atom will be (1996)
(a) 144
(b) 143
(c) 148
(d) 146

15. Half-life for radioactive ¹⁴C is 5760 years. In how many years 200 mg of ¹⁴C will be reduced to 25 mg? (1995)
(a) 17280 years
(b) 23040 years
(c) 5760 years
(d) 11520 years

16. In a radioactive decay, an emitted electron comes from  (1994)
(a) outermost orbit of the atom
(b) orbit having principal quantum number one
(c) nucleus of the atom
(d) inner orbital of the atom.

17. If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be (1992)
(a) 2 and 1
(b) 3 and 1
(c) 1 and 1
(d) 1 and 3

18. The age of most ancient geological formations is estimated by (1989)
(a) potassium – argon method
(b) carbon – 14 dating method
(c) radium – silicon method
(d) uranium – lead method.

19. Emission of an alpha particle leads to a (1989)
(a) decrease of 2 units in the charge of the atom
(b) increase of 2 units in the mass of the atom
(c) decrease of 2 units in the mass of the atom
(d) increase of 4 units in the mass of the atom.

EXPLANATIONS