JEE Questions for Chemistry Nuclear Chemistry Quiz 1 - MCQExams.com

The half-life of Ra 226 is 1620 yr, the decay constant (k) is
  • 0.000452
  • 0.0004278
  • 0.04278
  • 0.004278
A radioactive isotope has a half-life of 27 days. Starting with 4 g of the isotope, what will be mass remaining after 75 days ?
  • 100 g
  • 50 g
  • 0.58 g
  • 1.58 g
In a radioactive decay, an emitted electron comes from
  • the nucleus of atom
  • the orbit with principal quantum number 1
  • the inner orbital of the atom
  • the outermost orbit of the atom
If half-life period is 100 yr, average life is nearly
  • 100 yr
  • 70 yr
  • 144 yr
  • 90 yr
What is the fuel of atomic pile ?
  • Thorium
  • Sodium
  • Uranium
  • Petroleum
Which of the following has magic number of neutrons?
  • 13Al27
  • 26Fe56
  • 83Bi209
  • 92U238
The cause of instability of nucleus is
  • high proton, electron ratio
  • high proton, neutron ratio
  • low proton, electron ratio
  • low proton, neutron ratio
If the mass defect of 5B11 is 0.081 u, its average binding energy (in MeV) is
  • 8.60
  • 6.85
  • 5.60
  • 5.86
In terms of energy 1 u is equal to
  • 100 J
  • 931.1 kcal
  • 931.1 MeV
  • 107 erg
The energy released in an atom bomb explosion is mainly due to
  • release of neutrons
  • release of electrons
  • greater mass of products than initial material
  • lesser mass of products than initial material
Nuclides
  • have specific atomic numbers
  • have same number of protons
  • have specific atomic number and mass numbers
  • are isotopes
Decrease in atomic number is not observed during
  • α - emission
  • β - emission
  • positron emission
  • electron capture
Which of the following has the maximum penetrating power ?
  • α - particle
  • Proton
  • γ - radiation
  • Positron
In successive emission of α and β-particles, the number of α and β-particles should be emitted for the conversion of 92 U 238 to 82 Pb 206 are
  • 7α, 5β
  • 6α, 4β
  • 4α, 3β
  • 8α, 6β
Which one of the following statements is not correct?

  • Chemistry-Nuclear Chemistry-5451.png
  • 2)
    Chemistry-Nuclear Chemistry-5452.png
  • BF3 is a Lewis acid
  • CN- is a very strong ligand

Chemistry-Nuclear Chemistry-5454.png
  • 10
  • 8
  • 6
  • 2
Highest ionising power is exhibited by
  • α - rays
  • β - rays
  • γ - rays
  • X - rays

Chemistry-Nuclear Chemistry-5457.png
  • 22/10
  • 22/11
  • 23/10
  • 23/12
A radioactive substance 88 X 228 (IIA) emits 3 α and 3 β particles to form 'Y '. To which group of long form of the periodic table does 'Y ' belong ?
  • IVA
  • VA
  • VIA
  • VIIA
Uranium with a mass number 237 and atomic number 92, changes to a nucleus with atomic number 90 and mass number 233 on emission of
  • β-particle
  • γ-particle
  • α -particle
  • positron
Gamma rays have
  • no mass and no charge
  • Only mass
  • Only charge
  • Both mass and charge
When any radioactive element emits β-particle some product is obtained. They both are
  • isotopes
  • isobars
  • isomers
  • isotones
Electrical field is used to deflect
  • α and β-particles
  • α and γ-particles
  • α ,β and γ-particles
  • β and γ-particles
What is the correct order of velocity of alpha (α ), beta (β) and gamma (γ) rays ?
  • α > β > γ
  • α > γ > β
  • γ > α > β
  • γ > β > α
Loss of a beta particle is equivalent to
  • increase of one neutron only
  • decrease of one neutron only
  • Both (and (2)
  • None of the above
β-particle is emitted in a radioactive reaction when
  • a proton changes to neutron
  • a neutron changes to proton
  • a neutron changes to electron
  • an electron changes to neutron
Penetrating power of waves are
  • γ > α > β
  • γ < α > β
  • γ > X-ray
  • γ > α < β
The half-life of 14C is 5570 yr. How many years will it take for 90% of a sample to decompose?
  • 5.570 yr
  • 171700 yr
  • 18600 yr
  • 50100 yr
A radioactive isotope has a-life of 10 yr. What percentage of the original amount of it ramain after 20 yr?
  • 0
  • 12.5
  • 8
  • 25

Chemistry-Nuclear Chemistry-5468.png
  • 60 min
  • 45 min
  • 30 min
  • 15 min
0:0:1


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