Solved papers for NEET Chemistry NEET PYQ-Nuclear Chemistry

done NEET PYQ-Nuclear Chemistry Total Questions - 8

• question_answer1) Sulphur = 35 (34.96903 amu) emits a \[\beta \]-particle but no \[\gamma \]-ray. The product is chlorine = 35 (34.96885 amu). The maximum energy emitted by the alpha-particle is:                    [AIPMT 1999]
  A)
  16.758 MeV
  done clear
  B)
  1.6758 MeV
  done clear
  C)
              0.16758 MeV
  done clear
  D)
  0.016758 MeV
  done clear
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• question_answer2) In the following radioactive decay, \[_{92}{{X}^{232}}\xrightarrow[{}]{{}}{{\,}_{89}}{{Y}^{220}},\] how many \[\alpha \] and \[\beta \] particles are ejected from X to Y? [AIPMT 1999]
  A)
  \[3\,\alpha \] and \[2\,\beta \]
  done clear
  B)
  \[5\,\alpha \] and
  done clear
  C)
              \[3\,\alpha \] and \[3\,\beta \]
  done clear
  D)
  \[5\,\alpha \] and \[5\,\beta \]
  done clear
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• question_answer3) The half-life of \[_{6}{{C}^{14}},\] (\[\lambda =2.31\times {{10}^{4}}\] per year) is: [AIPMT 1999]
  A)
              \[2\times {{10}^{2}}\] year
  done clear
  B)
  \[3\times {{10}^{3}}\] year
  done clear
  C)
  \[3.3\times {{10}^{4}}\] year
  done clear
  D)
  \[4\times {{10}^{3}}\] year
  done clear
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• question_answer4) The half-life of a radioactive isotope is three hours. If the initial mass of the isotope was 300 g, the mass which remained undecayed after 18 hours would be:                                 [AIPMT 2000]
  A)
  4.68 g
  done clear
  B)
  2.34 g
  done clear
  C)
  1.17 g
  done clear
  D)
  9.36 g
  done clear
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• question_answer5) 

  A human body required the 0.01 M activity of radioactive substance after 24 hour.

  Half-life of radioactive is 6 hour. Then injection of maximum activity of radioactive substance that can be injected: [AIPMT 2001]

  A)
  0.08
  done clear
  B)
  0.04
  done clear
  C)
  0.16     
  done clear
  D)
  0.32
  done clear
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• question_answer6) If \[_{b}^{a}X\] species emit firstly a positron, then two \[\alpha \] and two \[\beta \] and in last one a is also emitted and finally convert in \[_{d}^{c}Y\] species so correct relation is: [AIPMT 2001]
  A)
              \[a=c+12,\text{ }d=b5\]
  done clear
  B)
  \[a=c-8,\text{ }d=b-1\]
  done clear
  C)
  \[a=c-6,\text{ }d=b-0\]
  done clear
  D)
  \[~a=c-4,\text{ }a=b-2\]
  done clear
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• question_answer7) \[_{92}{{U}^{235}}\] nucleus absorb a neutron and disintegrate in \[_{54}X{{e}^{139}}{{,}_{38}}S{{r}^{94}}\] and X so, what will be product X : [AIPMT 2002]
  A)
  3-neutrons
  done clear
  B)
  2-neutrons
  done clear
  C)
  \[\alpha \]-particle
  done clear
  D)
  \[\beta \]-particle
  done clear
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• question_answer8) The radioisotope, tritium \[(\,_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?                               [AIPMT 2003]
  A)
  4 mg
  done clear
  B)
  8 mg
  done clear
  C)
  1 mg
  done clear
  D)
  2 mg
  done clear
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