JEE Questions for Chemistry Nuclear Chemistry Quiz 7 - MCQExams.com

A radioactive sample has half life of 1500 years. A sealed tube containing 1 g of a sample will contain g of the sample after 3000 years.The missing figure is
  • 1 g
  • 0.5 g
  • 0.25 g
  • 0 g

Chemistry-Nuclear Chemistry-5700.png
  • isotopes and isotones
  • isotopes and isobars
  • isotones and isotopes
  • isobars and isotopes
Which of the following is easily stopped by air?
  • X – rays
  • UV – rays
  • γ − rays
  • α − rays

Chemistry-Nuclear Chemistry-5701.png
  • A = 87, M = 233
  • A= 86, M = 226
  • A= 88, M = 235
  • A= 88, M = 236
Elements having the same number of nucleons and different number of protons are
  • Isotones
  • Positrons
  • Isotopes
  • Isobars

Chemistry-Nuclear Chemistry-5703.png
  • 4, 1
  • 3, 7
  • 8, 1
  • 4, 7

Chemistry-Nuclear Chemistry-5705.png
  • 3
  • 4
  • 6
  • 2
In the case of a radioisotope, the value of t1/2 and λ are identical in magnitude. The value is
  • 1/0 .693
  • (0.693)2
  • 0.693
  • (0.693)1/2
The activity of a sample of Ti (Z=decreased by 90% over a period of 10 years. The half life of sample is
  • 1 year
  • 2 years
  • 3 years
  • 5 years
A certain nuclide has a half – life of 60 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, the atoms remaining will be nearly
  • 200
  • 75
  • 450
  • 50
A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms atoms will remain ?
  • 200 atoms
  • 450 atoms
  • 75 atoms
  • 150 atoms
The half- life period of a radioactive element is 140 days. After 560 days, one gram of the element will be reduced to

  • Chemistry-Nuclear Chemistry-5711.png
  • 2)
    Chemistry-Nuclear Chemistry-5712.png

  • Chemistry-Nuclear Chemistry-5713.png

  • Chemistry-Nuclear Chemistry-5714.png
The half- life of a radioactive element is 2.4 hours. Starting with 10 g of it , how many grams will remain after a period of 9.6 hours?
  • 1.25 g
  • 1.77 g
  • 0.63 g
  • 0.5 g
A certain nuclide has half life period of 30 min. If a sample containing 6 × 1010 atoms is allowed to decay for 90 min, how many atoms will remain?

  • Chemistry-Nuclear Chemistry-5717.png
  • 2)
    Chemistry-Nuclear Chemistry-5718.png

  • Chemistry-Nuclear Chemistry-5719.png

  • Chemistry-Nuclear Chemistry-5720.png
The half – life period of a radioactive element is 30 min. One sixteenth of the original quantity of the element will remain unchanged after
  • One hour
  • Sixteen hours
  • Four hours
  • Two hours
The half life of radium is 1600 years. After how much time will 1 g radium be reduced to 125 mg?
  • 1800 years
  • 1600 years
  • 3200 years
  • 4800 years

Chemistry-Nuclear Chemistry-5724.png
  • 22.5 hours
  • 30 hours
  • 60 hours
  • 3.75 hours
Half- life of radium is 1580 years.Its average life will be

  • Chemistry-Nuclear Chemistry-5726.png
  • 2)
    Chemistry-Nuclear Chemistry-5727.png

  • Chemistry-Nuclear Chemistry-5728.png

  • Chemistry-Nuclear Chemistry-5729.png

Chemistry-Nuclear Chemistry-5731.png
  • 428
  • 200
  • 100
  • 50
Sulphur – 35 (34. 96903 amu) emits a β − particle but no ray. γ − The product is chlorine- 35 (34.96885 a.m.u.) The maximum energy emitted by the β − particle is
  • 16.758 MeV
  • 1.6758 MeV
  • 0.16758 MeV
  • 0.016758MeV

Chemistry-Nuclear Chemistry-5733.png

  • Chemistry-Nuclear Chemistry-5734.png
  • 2)
    Chemistry-Nuclear Chemistry-5735.png

  • Chemistry-Nuclear Chemistry-5736.png

  • Chemistry-Nuclear Chemistry-5737.png
The t1/2 of cobalt–60 is 5.27 years (λ = 2.5 × 10–7 min–1). The decay activity of 2.0 g of sample is about

  • Chemistry-Nuclear Chemistry-5739.png
  • 2)
    Chemistry-Nuclear Chemistry-5740.png

  • Chemistry-Nuclear Chemistry-5741.png

  • Chemistry-Nuclear Chemistry-5742.png
The mass of helium atom of mass number 4 is 4.0026 amu,while that of the neutron and proton are 1.0087 and 1.0078 respectively on the same scale. Hence the nuclear binding energy per nucleon in the helium atom is nearly
  • 5 MeV
  • 7 MeV
  • 10 MeV
  • 14 MeV
The nuclides with 20 < Z < 82 lying above the stability belt decay by
  • β+ – emission
  • β– – emission
  • α − decay
  • K – electron capture
Which of the following ratio will give stability to daughter element, when radioactive parent element has less number of protons compared to number of neutrons?

  • Chemistry-Nuclear Chemistry-5744.png
  • 2)
    Chemistry-Nuclear Chemistry-5745.png

  • Chemistry-Nuclear Chemistry-5746.png

  • Chemistry-Nuclear Chemistry-5747.png
Energy released, when one atom of uranium undergoes nuclear fission according to the following reaction is (atomic mass of U = 235.060, Ba = 143.881 and Kr = 89.about
92U235 + 0 n1 → 56Ba144 + 36Kr90 + 20 n1
  • 235 MeV
  • 208 MeV
  • 931.5 MeV
  • 5.33 × 1023 MeV
  • 20.8 MeV

Chemistry-Nuclear Chemistry-5750.png
  • 0.018 u
  • 0.18 u
  • 0.0018 u
  • 1.8 u
  • 18 u
The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in the periodic table ?
Chemistry-Nuclear Chemistry-5752.png
  • I
  • VII
  • VIII
  • III
11Na24 is radioactive and it decays to
  • 9F20 and α- particles
  • 13Al24 and position
  • 11Na23 and neutron
  • 12Mg24 and β- particles

Chemistry-Nuclear Chemistry-5759.png
  • (D, α)
  • (α, n)
  • (n, α)
  • (p, α)
0:0:1


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