Chemistry - Nuclear Chemistry
Exam Duration: 45 Mins Total Questions : 30
Which of the following is radioactive?
- (a)
Li
- (b)
Rb
- (c)
Cs
- (d)
Fr
A sample of radioactive element with half-life period of 11.2 years weighs 2 g. After 33.6 years the weight of the element left is
- (a)
1 g
- (b)
0.75 g
- (c)
0.5 g
- (d)
0.25 g
The fundamental particle responsible for keeping the nucleus together is
- (a)
meson
- (b)
antiproton
- (c)
positron
- (d)
hyperon
Which of the following statements is true:
- (a)
Average life is the reciprocal of the disintegration constant:
- (b)
Average life is represented by \(\frac { 1 }{ \alpha } \)
- (c)
Average life is equal to 1.44t1/2
- (d)
ALL OF THE ABOVE
Isobars are produced as a result of emission of
- (a)
\(\alpha\)-particle
- (b)
\(\beta\) -particle
- (c)
X-rays
- (d)
\(\gamma\)-rays
Which of the following particles cannot be accelersted?
- (a)
\(\alpha\) -particles
- (b)
electrons
- (c)
neutrons
- (d)
protons
The artificial transmutation of elements was discovered by
- (a)
Bohr
- (b)
Rutherford
- (c)
J.J. Thomson
- (d)
Madam Curie
Which of the following have been prepared artificially?
- (a)
Uranium and Thorium
- (b)
Einsteinium and Fermium
- (c)
Radium and Polonium
- (d)
Thorium and Hafnium
The half-time of a radioactive element depends on
- (a)
amount of element
- (b)
pressure
- (c)
temperature
- (d)
NONE OF THE ABOVE
Which of the radioactive isotopes is used for temperature control in blood disease?
- (a)
P-32
- (b)
H-3
- (c)
Rn-223
- (d)
I-131
If the half-life for 14C is 5770 years, the n t3/4 is
- (a)
5760 X \(\frac { 3 }{ 4 } \) years
- (b)
5760 X 1 year
- (c)
5760 X2 years
- (d)
5760 X \(\frac { 4 }{ 3 } \) years
The half-life of \(_{ 84 }^{ 216 }{ Po }\) is 0.16 sec. How long will it take a sample of this nucleus to decay to 90 %
- (a)
0.16 sec
- (b)
0.32 sec
- (c)
0.48 sec
- (d)
0.53 sec
In a radioactive decay which one of the following moves dastest?
- (a)
\(\alpha \)-particle
- (b)
\(\beta\)-particle
- (c)
\(\gamma\)-particle
- (d)
positron
Which element is the end product of every of every natural radioactive series?
- (a)
Pb
- (b)
Sn
- (c)
C
- (d)
Bi
A radioactive element X emits 3\(\alpha\), 1 \(\beta\) and 1 \(\gamma\)-particles and forms \(_{ 76 }^{ 225 }{ Y }\). Element X is
- (a)
\(_{ 81 }^{ 237 }{ X }\)
- (b)
\(_{ 80 }^{ 237 }{ X }\)
- (c)
\(_{ 81 }^{ 236 }{ X }\)
- (d)
\(_{ 80 }^{ 236 }{ X }\)
The radioactive decay of \(_{ 35 }^{ 88 }{ X }\) by \(\beta \) -particle emission produces an unstable nucleus which spontaneously emits a neutron. The final product is
- (a)
\(_{ 37 }^{ 88 }{ X }\)
- (b)
\(_{ 35 }^{ 89 }{ Y }\)
- (c)
\(_{ 34 }^{ 88 }{ Z }\)
- (d)
\(_{ 36 }^{ 87 }{ W }\)
If half-life of substance is 5 years, then the total amount of substance left after 15 years, when initial amount is 64 gram.
- (a)
16 g
- (b)
2 g
- (c)
32 g
- (d)
8 g
What is X in the nuclear reaction? 14N + X \(\rightarrow\) 14C + 1H
- (a)
1H
- (b)
\(_{ +1 }^{ 0 }{ e }\)
- (c)
\(_{ 0 }^{ 1 }{ n }\)
- (d)
\(_{ 1 }^{ 0 }{ e }\)
Which of the following will be called projectile in the nucleus reaction? 14N + 4He \(\rightarrow\) 17O + 1H
- (a)
14N
- (b)
4He
- (c)
17O
- (d)
1H
\(_{ 90 }^{ 235 }{ U }\) is a member of the actinium decay series. Another member of the same series is
- (a)
\(_{ 90 }^{ 234 }{ Th }\)
- (b)
\(_{ 93 }^{ 234 }Np\)
- (c)
\(_{ 90 }^{ 235 }Th\)
- (d)
\(_{ 86 }^{ 210 }Rn\)
The activity of a sample is defined as the number of disintegrations per unit time. If \(\lambda \) represents the decay or disintegration constant, the activity of the sample is given by
- (a)
N/No
- (b)
\(\lambda\)N
- (c)
N/\(\lambda\)
- (d)
None of these
Which one of the following projectiles can be used to bombard 7N to give \(_{ 8 }^{ 17 }{ O }\)?
- (a)
\(_{ 1 }^{ 2 }{ H }\)
- (b)
\(_{ 1 }^{ 1 }{ H }\)
- (c)
\(_{ 2 }^{ 4 }{ He }\)
- (d)
\(_{ 0 }^{ 1 }{ n }\)
The end product of (4n+2) disintegration series is
- (a)
\(_{ 82 }^{ 204 }{ Pb }\)
- (b)
\(_{ 82 }^{ 208 }{ Pb }\)
- (c)
\(_{ 82 }^{ 209 }{ Pb }\)
- (d)
\(_{ 82 }^{ 206 }{ Pb }\)
\(_{ 92 }^{ 238 }{ U }\) during a series of \(\alpha\) and \(\beta\) decay; loses in all 8\(\alpha\) and 6\(\beta\) particles. The atomic mass and number of the end product would be
- (a)
206, 82
- (b)
212, 90
- (c)
227, 76
- (d)
238, 90
In the nuclear reaction \(_{ 92 }^{ 238 }U\) \(\rightarrow\) \(_{ 82 }^{ 206 }Pb\) the number of \(\alpha\) and \(\beta\) particles emitted are
- (a)
7\(\alpha\), 5\(\beta\)
- (b)
6\(\alpha\), 4\(\beta\)
- (c)
4\(\alpha\), 3\(\beta\)
- (d)
8\(\alpha\), 6\(\beta\)
A radioactive isotope decays according to the given reaction under STP condition as follows \(_{ Z }^{ A }{ X\quad \longrightarrow _{ Z-2 }^{ A-4 }{ X+_{ 2 }^{ 4 }\quad } }\)He.Its half-time is 10 days The volume of helium collected in 20 days if one mole of \(_{ Z }^{ A }{ X\quad }\)is kept in a sealed container ,is
- (a)
33.6 litres
- (b)
22.4 litres
- (c)
16.8 litres
- (d)
11.4 litres
The end product of (4n+2) disintegration series is
- (a)
\(_{ 82 }^{ 204 }{ Pb }\)
- (b)
\(_{ 82 }^{ 208 }{ Pb }\)
- (c)
\(_{ 82 }^{ 206 }{ Pb }\)
- (d)
\(_{ 82 }^{ 209 }{ Pb }\)
Which one of the following notation shows the product incorrectly?
- (a)
\(_{ 96 }^{ 242 }{ CM(\alpha ,2n)_{ 97 }^{ 243 }{ Bk } }\)
- (b)
\(_{ 5 }^{ 10 }{ B(\alpha ,n)_{ 7 }^{ 13 }{ N } }\)
- (c)
\(_{ 7 }^{ 14 }{ N(n,p)_{ 6 }^{ 14 }{ C } }\)
- (d)
\(_{ 14 }^{ 28 }{ Si(d,n)_{ 15 }^{ 29 }{ P } }\)
Which does not take place by \(\alpha \)-disintegration?
- (a)
\(_{ 92 }^{ 238 }{ U }\rightarrow _{ 90 }^{ 234 }{ U }\)
- (b)
\(_{ 90 }^{ 232 }{ Th }\rightarrow _{ 88 }^{ 228 }{ Ra }\)
- (c)
\(_{ 88 }^{ 226 }{ Ra }\rightarrow _{ 86 }^{ 223 }{ Rn}\)
- (d)
\(_{ 83 }^{ 213 }{ Bi }\rightarrow _{ 84 }^{ 213 }{ Po }\)
Energy released in the nuclear fusion reaction is
\(_{ 1 }^{ 2 }{ H }+_{ 1 }^{ 3 }{ H }\rightarrow _{ 2 }^{ 4 }{ He }+_{ 0 }^{ 1 }{ n }\)
Atomic mass of \(_{ 1 }^{ 2 }{ H=2.014 }\); \(_{ 1 }^{ 3 }{ H=3.016 }\) \(_{ 2 }^{ 4 }{ He=4.003 }\), \(_{ 0 }^{ 1 }{ n=1.009 }\) (all in amu)
- (a)
16.06 MeV
- (b)
500 J
- (c)
4X106 kcal.
- (d)
8.30 eV