JEE Questions for Chemistry Nuclear Chemistry Quiz 6 - MCQExams.com


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The nuclides with Z > 82 lying above the stability belt decay by
  • α − emission
  • β– – emission
  • Positron (β+) – emission
  • K – electron capture

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  • (γ , n)
  • (p, D)
  • (n, D)
  • (γ , P)
How many alpha and beta particles will be released in the nuclear reaction given below
90 Th 232 → 82 Pb 208 ?
  • 6α and 4β
  • 6α and 6β
  • 4α and 6β
  • 4α and 4β
By natural radioactivity U238 undergoes by following change,

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  • 92 and 234
  • 90 and 236
  • 90 and 234
  • 91 and 234
The total number of α and β - particles emitted in the nuclear reaction
92 U 238 → 82 Pb 214 is
  • 2
  • 4
  • 6
  • 8

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During the transformation of b X a → d Y c the number of β-particles emitted is
  • (b - d )/4
  • (c - a) + 1/2 (b - d )
  • (a - c) - 1/2 (b - d )
  • (b - d ) + 2 (c - a)
  • (b - d ) + 1/2 (c - a)

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  • 22.40 mL
  • 33.40 mL
  • 55.40 mL
  • 66.40 mL
Bombardment of aluminium by α-particle leads to its artificial disintegration in two ways, (i) and (ii) as shown. Products X, Y and Z respectively are,
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  • proton, neutron, positron
  • neutron, positron, proton
  • proton, positron, neutron
  • positron, proton, neutron

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  • 2
  • 4
  • 6
  • 16
If Uranium (mass number 238 and atomic numberemits an α-particle, the product has mass number and atomic number
  • 236 and 92
  • 234 and 90
  • 238 and 90
  • 236 and 90.
The radiations from a naturally occurring radioactive substance as seen after deflection by a magnetic field in one direction are
  • definitely α − rays
  • definitely rays β − rays
  • both and rays α β− rays
  • either or rays α β− rays

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The increasing order for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and alpha particle (α) is
  • e, p, n, α
  • n, p, e, α
  • n, p, α ,e
  • n, α ,p,e

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The age of most ancient geological formations is estimated by
  • Potassium – argon method
  • Carbon –14 dating method
  • Radium silicon method
  • Uranium – lead method
The decay constant of a radioactive sample is λ . The half- life and mean life of the sample are, respectively

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Which of the following does not characterize X – rays ?
  • The radiation can ionize gases
  • It causes ZnS to fluoresce
  • Deflected by electric and magnetic fields
  • Have wavelengths shorter than ultraviolet rays
The number of neutrons in the parent nucleus which gives 14N on beta emission is
  • 6
  • 7
  • 8
  • 14

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  • 138
  • 140
  • 144
  • 150
Which of the following statements is wrong ?
  • P33 is used in the treatment of Leukaemia
  • I131 is used in the treatment of Thyroid Gland Cancer

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  • Excessive use of Radio active elements is responsible for Cancerous growth.

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  • 144
  • 143
  • 142
  • 146

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Which of the following is used as moderator in nuclear reactors ?
  • D2O
  • H2O
  • Alum
  • Any of them
The basis for carbon – 14 dating method is that the
  • Carbon – 14 fraction is the same in all objects
  • Carbon- 14 is highly unstable and is readily lost from the objects
  • The ratio of carbon – 14 to carbon – 12 in our atomsphere has always been constant
  • Living tissue will not absorb carbon – 14 but will absorb carbon – 12 from their sources of carbon.

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  • X and Y
  • X and Z
  • X and W
  • None of these
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