Unit12 Nuclear chemistry qns

Unit12 Nuclear chemistry qns - 1 UNIT 12 NUCLEAR CHEMISTRY...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 12 NUCLEAR CHEMISTRY 1. Rand dioactivity was discovered by (a) Becquereo (b) Curie (c) Rutherford (d) Chadwick 2. The equivalence of mass and energy was stated mathematically (a) Eistein (b) Bohar (c) Oppenheimer (d) curie 3. The endproduct of radioactive is an isotope of the element (a) U (b) Bi (c) Na (d) Pb 4. The element of Z =50 is most stabel when (a) no. of p =no. of n (b) no. of n>no. of p (c) no.of p – no. of e (d) no. of n< no. p 5. Magic number eleemnts are those isotopes of elements (a) in which the number of protons neutrons is 2,8,20,28,50,82,126 (b) are relatively more abundant (c) all of these 6. P 29 15 has p n ratio too low for stability. Its stability can be increased by (a) positron emission (b) beta-decay (c) electron capture 7. Rb 81 37 is neutron poor. Its stability can be increased by (a) position emission (b) beta-decay (c) alpha – decay (d) electron capture 8. The common ore of Ra is (a) sitibinite (b) pitch blende (c) reagler (d) bornite 9. The half-life of R n is (a) 4.5 × 10 9 years (b) 3.8 days (c) 3.1 minutes (d) 24.1 days 10. A radiation detector often used to keep a record of exposure to penetrating rediation is (a) Geiger-Muller Counter (b) Wilson cloud Chamber (c) Scintillation Chamber (d) Film Badge 11. The S.I. unit of radioactivity is (a) cure (b) Micro-Curie (c) Rutherford (d) Becqerel 12. The mass of radium ( ) Ra 226 88 that has radioactivity of one micro-curie(half life for Ra = 5.12 × !0 10 sec) is nearly (a) 10 –6 g (b) 10 –5 g (c) 10 –4 g (d) 10 –3 g 13. The half life of 83 214 Bi is 19.7 minutes. The mass of this isotope that has an activity of 2.5 milli-curie is (a) 5.6 × 10 –11 (b) 2.8 × 10 –12 (c) 1.46 × 10 –13 (d) 7 × 10 –14 14. The half life of 86 222 Rn gas in 4 days. Starting with 10 mgs of the isotope, what amount will remain after 16 days ? (a) mgs 8 5 (b) mgs 16 1 (c) 9 mgs 8 3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 (d) none of these 15. The half of a radio-isotope is 35 sec. In what period of the time would the activity of sample be reduced to 64 1 of the original activity ? (a) 210 sec.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

Unit12 Nuclear chemistry qns - 1 UNIT 12 NUCLEAR CHEMISTRY...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online