JEE Main Chemistry - Nuclear Chemistry
Exam Duration: 60 Mins Total Questions : 30
A photon of hard gamma-rays knocks a proton of 26Mg nuclues. The substance produced is
- (a)
an isotope nucleus 25Na
- (b)
an isobar nucleus 23Na
- (c)
an isotope nucleus 26Na
- (d)
an isobar nucleus 26Mg
Which one of the following atom will contain the least number of neutrons?
- (a)
235U
- (b)
238U
- (c)
239U
- (d)
240U
The isotope 40K transforms into the isotope 40Ca. What kind of radioactive decay occurs in this case?
- (a)
k-electron capture
- (b)
\(\alpha-decay\)
- (c)
\(\beta-decay\)
- (d)
positron decay
initial mass of a radioactive element is 160 g. How many grams of it would be left after 24 years if its half-life period is 6 years?
- (a)
6
- (b)
8
- (c)
10
- (d)
40
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
Which one of the following statements is true?
- (a)
Nuclei having 2, 8, 20, 28, 50, 82, or 126 protons or neutrons are stable; these are called magic numbers.
- (b)
one curie=3.7X1010 Bcquerel (or dps).
- (c)
a breeder reactor is the one which non-fissionable U-238 is convered into fissionable plutonium.
- (d)
ALL OF THE ABOVE
Which one of the following statements is true?
- (a)
The difference between mass of an atom and the sum of masses of neutrons and protons present in it is called mass defect.
- (b)
Binding energy is the amount energy lost in the formation of nuclide from its nucleons.
- (c)
Uranium-lead dating is a technique used for estimating the age of rocks and minerals.
- (d)
ALL OF THE ABOVE
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
The isotopic mass of \(_{ 92 }^{ 238 }{ U }\) is 238. 15 amu. its packing fraction is
- (a)
1.25
- (b)
0.125
- (c)
5.25
- (d)
9.5
A device used for the measurement of radioactivity is
- (a)
mass spectrometer
- (b)
cyclotron
- (c)
nuclear reactor
- (d)
G.M. Counter
The radio isotope used in the treatment of cancer:
- (a)
C-12
- (b)
Co-60
- (c)
I-131
- (d)
P-32
Which of the following have been prepared artificially?
- (a)
Uranium and Thorium
- (b)
Einsteinium and Fermium
- (c)
Radium and Polonium
- (d)
Thorium and Hafnium
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
An isotope is formed when successive radioactive emissions of an elements are
- (a)
\(\alpha, \alpha, \alpha\)
- (b)
\(\alpha, \beta, \alpha\)
- (c)
\(\alpha, \beta, \beta\)
- (d)
\(\beta, \beta, \beta\)
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
Number of neutrons in a parent nucleus X, which gives \(_{ 7 }^{ 14 }{ N }\) after two successive \(\beta \) - emissions would be
- (a)
6
- (b)
7
- (c)
8
- (d)
9
The t1/2 of radioactive element is 140 days. In 560 days a sample of this element would be reduced to .... of its initila mass.
- (a)
\(\frac { 1 }{ 2 } \)
- (b)
\(\frac { 1 }{ 4 } \)
- (c)
\(\frac { 1 }{ 8 } \)
- (d)
\(\frac { 1 }{ 16 } \)
In a radioactive decay which one of the following moves dastest?
- (a)
\(\alpha \)-particle
- (b)
\(\beta\)-particle
- (c)
\(\gamma\)-particle
- (d)
positron
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)
\(_{ 36 }^{ 87 }{ W }\)
Which of the following is incorrect?
- (a)
45SC + \(_{ 0 }^{ 1 }{ n }\) \(\rightarrow\) 45Cu + \(_{ 1 }^{ 0 }{ n }\)
- (b)
209Bi + 2H \(\rightarrow\) 210Po + \(_{ 0 }^{ 1 }{ n }\)
- (c)
7Li + 1H \(\rightarrow\) 7Be + \(_{ 0 }^{ 1 }{ n }\)
- (d)
75As + 4He \(\rightarrow\) 78Br + \(_{ 0 }^{ 1 }{ n }\)
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)
\(_{ 86 }^{ 210 }Rn\)
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)
\(_{ 82 }^{ 206 }{ Pb }\)
In the radiaactive change\(_{ Z }^{ A }{ P }\) \(\rightarrow\) \(_{ Z+1 }^{ A }{ Q }\) \(\rightarrow\) \(_{ Z-1 }^{ A-4 }R\) \(\rightarrow\) \(_{ Z-1 }^{ A-4 }{ S }\)
- (a)
\(\alpha, \beta, \gamma\)
- (b)
\(\gamma, \alpha, \beta\)
- (c)
\(\beta, \gamma , \alpha\)
- (d)
\(\beta, \alpha, \gamma\)
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)
\(_{ 82 }^{ 209 }{ Pb }\)
\({ 6 }^{ C^{ 14 } }\)in the upper atmosphere is formed by the action of neutrons on
- (a)
\(_{ 7 }^{ 14 }{ N }\)
- (b)
\(_{ 8 }^{ 17 }{ O }\)
- (c)
\(_{ 6 }^{ 12 }{ C }\)
- (d)
\(_{ 8 }^{ 18 }{ O }\)
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)
\(_{ 14 }^{ 28 }{ Si(d,n)_{ 15 }^{ 29 }{ P } }\)
1654060945.png)
1654060942.png)
1653987551.png)
1653987086.png)
1582095229.jpg)
