Chemistry - Nuclear Chemistry

Question - 1

Initial mass of a radioactive element is 16 gm. How many grams of it would be left after 24 years if its half life is 8 years?

  • A 8
  • B 4
  • C 2
  • D 1

Question - 2

Proton is

  • A nucleus of deuterium
  • B Ionised hydrogen molecule
  • C ionised hydrogen atom
  • D an alpha particle

Question - 3

The radioactive isotope of hydrogen is known as

  • A protium
  • B deuterium
  • C tritium
  • D para-hydrogen

Question - 4

Which of the following is radioactive?

  • A Li
  • B Rb
  • C Cs
  • D Fr

Question - 5

Gamma rays are essentially

  • A electromagnetic radiations
  • B high speed electrons
  • C high speed neutrons
  • D high speed protons

Question - 6

An isotope of parent element is produced when it loses

  • A an alpha particle
  • B a beta particle
  • C one alpha and two beta particles
  • D one beta and two alpha particles

Question - 7

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

Question - 8

Which one of the following atom will contain the least number of neutrons?

  • A 235U
  • B 238U
  • C 239U
  • D 240U

Question - 9

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

Question - 10

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
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