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self evaluation test on nuclear chemistry with answers., Exercises of Chemistry

It contains objective and assertion- reason type questions with detailed solutions.

Typology: Exercises

2021/2022

Available from 05/24/2022

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Nuclear Chemistry 301
1. When
7
3Li
are bombarded with protons,
-rays
are produced. The nuclide formed is [CPMT 1987]
(a)
8
3Li
(b)
8
4Be
(c)
9
3B
(d)
9
4Be
2. Nuclides [BVP 2003]
(a) Have specific atomic numbers
(b) Have same number of protons
(c) Have specific atomic number and mass
numbers
(d) Are isotopes
3. In the following nuclear reactions
1
17
8
4
2
14
7XOHeN
and
1
X
and
2
X
are respectively [MP PMT 1999]
(a)
1
1H
and
1
0n
(b)
1
0n
and
1
1H
(c)
4
2He
and
1
0n
(d)
1
0n
and
4
2He
4. Gamma rays are
[NCERT 1978; MNR 1990; UP SEAT 1999, 2000]
(a) High energy electromagnetic waves
(b) High energy electrons
(c) High energy protons
(d) Low energy electrons
5. Which particle can be used to change
27
13 Al
into
30
15 P
[MP PMT 2003]
(a) Neutron (b)
-particle
(c) Proton (d) Deuteron
6. Which of the following does not characterise X-
rays
[UPSEAT 2001]
(a) The radiation can ionise gases
(b) It causes ZnS to fluorescence
(c) Deflected by electric and magnetic field
(d) Have wavelengths shorter than ultraviolet
rays
7. During emission of
-particle [Bihar MEE 1996]
(a) One electron increases
(b) One electron decreases
(c) One proton increases
(d) No change
(e) None of these
8. Emission is caused by the transformation of one
neutron into a proton. This results in the
formation of a new element having
(a) Same nuclear charge
(b) Very lower nuclear charge
(c) Nuclear charge higher by one unit
(d) Nuclear charge lower by one unit
9. The end product of
n4
series is [MNR 1983]
(a)
208
82 Pb
(b)
207
82 Pb
(c)
209
82 Pb
(d)
204
83 Bi
10.
235
92 U
belongs to group III B of periodic table. If
it loses one
-particle, the new element will
belong to group
[MNR 1984; CPMT 2001]
(a) I B (b) I A
(c) III B (d) V B
11. Radioactive disintegration differs from a chemical
change in being [UPSEAT 2000, 01, 02]
(a) An exothermic change
(b) A spontaneous process
(c) A nuclear process
(d) A unimolecular first order reaction
12. Half-life is the time in which 50% of radioactive
element disintegrates. Carbon-14 disintegrates
50% in 5770 years. Find the half-life of carbon-14[DPMT 1996]
(a) 5770 years
(b) 11540 years
(c)
5770
years
(d) None of the above
13. The half-life of
C
14
is about [MP PET 1996]
(a) 12.3 years
(b) 5730 years
(c)
9
105.4
years
pf3
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1. When

7 3 Li are bombarded with protons, (^) -rays

are produced. The nuclide formed is [CPMT 1987]

(a)

8 3 Li (b)

8 4 Be

(c)

9 3 B (d)

9 4

Be

2. Nuclides [BVP 2003]

(a) Have specific atomic numbers

(b) Have same number of protons

(c) Have specific atomic number and mass

numbers

(d) Are isotopes

3. In the following nuclear reactions

1

17 8

4 2

14 7 N^  HeOX^ and 2

28 14

2 1

27 13 Al^  DSiX

X 1 and X 2 are respectively [MP PMT 1999]

(a)

1 1 H and

1 0 n (b)

1 0 n and

1 1 H

(c)

4 2 He and

1 0 n (d)

1 0 n and

4 2 He

4. Gamma rays are

[NCERT 1978; MNR 1990; UPSEAT 1999, 2000]

(a) High energy electromagnetic waves

(b) High energy electrons

(c) High energy protons

(d) Low energy electrons

5. Which particle can be used to change

27 13 Al into

30 15

P

[MP PMT 2003]

(a) Neutron (b) -particle

(c) Proton (d) Deuteron

6. Which of the following does not characterise X -

rays

[UPSEAT 2001]

(a) The radiation can ionise gases

(b) It causes ZnS to fluorescence

(c) Deflected by electric and magnetic field

(d) Have wavelengths shorter than ultraviolet

rays

7. During emission of -particle [Bihar MEE 1996]

(a) One electron increases

(b) One electron decreases

(c) One proton increases

(d) No change

(e) None of these

8. Emission is caused by the transformation of one

neutron into a proton. This results in the

formation of a new element having

(a) Same nuclear charge

(b) Very lower nuclear charge

(c) Nuclear charge higher by one unit

(d) Nuclear charge lower by one unit

9. The end product of 4 n series is [MNR 1983]

(a)

208 82 Pb (b)

207 82 Pb

(c)

209 82 Pb (d)

204 83 Bi

235 (^) 92 U belongs to group III B of periodic table. If

it loses one -particle, the new element will

belong to group

[MNR 1984; CPMT 2001]

(a) I B (b) I A

(c) III B (d) V B

11. Radioactive disintegration differs from a chemical

change in being [UPSEAT 2000, 01, 02]

(a) An exothermic change

(b) A spontaneous process

(c) A nuclear process

(d) A unimolecular first order reaction

12. Half-life is the time in which 50% of radioactive

element disintegrates. Carbon- 14 disintegrates

50% in 5770 years. Find the half-life of carbon- 14 [DPMT 1996]

(a) 5770 years

(b) 11540 years

(c) 5770 years

(d) None of the above

13. The half-life of C

14 is about [MP PET 1996]

(a) 12.3 years

(b) 5730 years

(c)

9

  1. 5  10 years

(d)

5

  1. 52  10 years

14. Half-life for radioactive

14 C is 5760 years. In how

many years (^200) mg of

14 C sample will be reduced

to 25 mg

[CBSE PMT 1995]

(a) 11520 years (b) 23040 years

(c) 5760 years (d) 17280 years

15. The decay constant of a radioactive element is

6 1 3 10 min

  . Its half-life is

[MP PET 1993; Pb. CET 2002]

(a) 2. 31 10 min

5 

(b) 2. 31 10 min

6 

(c) 2. 31 10 min

 6 

(d) 2. 31 10 min

 7 

16. A radioactive sample decays to half of its initial

concentration in 6.93 minutes .It further decays

half in next 6.93 minutes. The rate constant for

the reaction is

[RPET 2000]

(a) 0.10 min

  • 1 (b) 0.01 min - 1

(c) 1.0 min

  • 1 (d) 0.001 min - 1 17. The half-life of an isotope is 10 hrs. How much

will be left behind after 4 hrs in 1 gm sample [BHU 1997]

(a)

23

  1. 6  10 atoms

(b)

23

  1. 56  10 atoms

(c)

21

  1. 56  10 atoms

(d)

21 45.^6 ^10 atoms

18. The half-life period t 1 / 2 of a radioactive element

is N years. The period of its complete decay is [KCET 1998]

(a)

2 N years (b) 2 N years

(c)

2

2

1 N years (d) Infinity

19. A radioactive element has a half-life of 20

minutes. How much time should elaspe before the

element is reduced to th 8

1 of the original mass [EAMCET 1990]

(a) 40 minutes

(b) 60 minutes

(c) 80 minutes

(d) 160 minutes

20. The half-life period of a radioactive material is 15

minutes. What % of radioactivity of that material

will remain after 45 minutes [MP

(a) 10 % (b) 12.5%

(c) 15% (d) 17.5%

21. Ra

226 disintegrates at such a rate that after 3160

years only one-fourth of its original amount remains.

The half-life of Ra

226 will be [MP PET 200

(a) 790 years (b) 3160 years

(c) 1580 years (d) 6230 years

22. The ratio of the amount of two elements X and Y

at radioactive equilibrium is

6 1 : 2 10

 . If the half-

life period of element Y is

4

  1. 9 10

  days, then the

half-life period of element X will be

(a)

3

  1. 8 10

  days (b) 245 days

(c) 122.5 days (d) None of these

23. If half-life of a substance is 5 yrs , then the total

amount of substance left after 15 years , when

initial amount is 64 grams is [AIEEE 2002]

(a) 16 grams (b) 2 grams

(c) 32 grams (d) 8 grams

24. An element has half-life 1600 years. The mass left

after 6400 years will be [AFMC 2003]

(a) 1/16 (b) 1/

(c) 1/4 (d) 1/

25. Wooden artitact and freshly cut tree are 7.6 and

1 1

  1. 2 min

  g of carbon ( 5760 t 1 / 2  years)

respectively. The age of the artitact is [AIIMS 1980]

(a) 576 0 years

(b)

  1. 6

  2. 2 5760  years

(c)

  1. 2

  2. 6 5760  years

(d) 5760 (^15.^2 ^7.^6 )years

26. An element has two main isotopes of mass

numbers 85 and 87. In nature they occur in the

ratio of 75% and 25% respectively. The atomic

weight of the element will be approximately

(a) 86.0 (b) 86.

(c) 85.5 (d) 85.

27. A sample of rock from moon contains equal

number of atoms of uranium and lead ( t 1 / 2 for

9 U  4. 5  10 years). The age of the rock would be [MNR 1988; UPSEAT 20

(a)

9

  1. 0  10 years

25. (a) ro  15. 2 and r  7. 6 , r

r t

o log

  1. 303

26. (c) Isotopes have 75% and 25% respectively.

 Atomic mass =  

27. (b) n

N N 2

0  , use N

t N t

o log

  1. 693

  2. 303 1 / 2

 

28. (c) 1 Ci = dps

10

  1. 7  10 or 3. 7 10.

10  Bq

1 mCi = dps

4

  1. 7  10.

29. (d) Tritium ( )

3 1 H consist of 1 proton and 2

neutrons.