JEE Questions for Chemistry Nuclear Chemistry Quiz 4 - MCQExams.com

Isotope of uranium used in atomic bomb is

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  • 2)
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  • 2)
    Chemistry-Nuclear Chemistry-5544.png

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Which of the following is not correct ?
  • Nuclei of atoms participate in nuclear reactions
  • 20Ca40 and 18Ar40 are isotones
  • 1 u of mass defect is approximately equal to 931.5 MeV
  • Uranium (U238 ) series is known as(4n +series
What is X in the following nuclear reaction ?
11Na23 + 0 n1 → 11Na24 + X
  • 1H1
  • 2He4
  • 1H2
  • γ-ray (gamma ray)

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  • 2)
    Chemistry-Nuclear Chemistry-5552.png

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  • 2)
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  • the isobar of parent nucleus
  • the isotope of parent nucleus
The nucleus of an atom is made up of X protons and Y neutrons. For the most stable and abundant nuclei
  • X and Y are both even
  • X and Y are both odd
  • X is even and Y is odd
  • X is odd and Y is even
Neutrino has
  • charge + 1 , mass 1
  • Charge 0, mass 0
  • Charge – 1, mass 1
  • Charge 0, mass 1
Which number is common to isotopes ?
  • Proton
  • Neutron
  • Proton and neutron
  • Nucleon
The decay of a radioactive element follows first order kinetics. As a result
  • The half – life period = a constant k where k is the decay constant
  • The rate of decay is independent of temperature
  • The rate can be changed by changing chemical conditions
  • The element will be completely transformed into a new element after the expiry of two half – life periods.
Which of the following isotopes is likely to be most stable?

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  • 2)
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  • None
The atomic number of bromine is 35 and its atomic weight is 80. Two isotopes of bromine are present in equal amounts. Which of the following statement represents the correct number of neutrons?
Chemistry-Nuclear Chemistry-5563.png
  • 1
  • 2
  • 3
  • 4

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  • Isomers
  • Isotopes
  • Isobars
  • Isoelectronic

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  • 2)
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  • IB
  • IA
  • IIIB
  • VB
During a negative β − decay
  • an atomic electron is ejected
  • an electron which is already present within the nucleus is ejected
  • a neutron in the nucleus decays emitting an electron
  • a part of binding energy of the nucleus is converted into an electron
In a chain reaction,uranium atom gets fissioned forming two different materials. The total weight of these put together is
  • more than the weight of parent uranium atom
  • less than the weight of parent uranium atom
  • more or less depends upon experimental conditions
  • neither more nor less
Nuclear reactions accompanied with the emission of neutron (s) is

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  • 2)
    Chemistry-Nuclear Chemistry-5573.png

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Emission of an alpha particle leads to a
  • Decrease of 2 units in the charge of the atom
  • Increase of 2 units in the mass of the atom
  • Decrease of 2 units in the mass of the atom
  • Increase of 4 units in the mass of the atom
Atoms with the same mass number but having different nuclear charges are called
  • Isotopes
  • Isotones
  • Isobars
  • Isochores
The fuel used in nuclear reactor is
  • heavy water
  • graphite
  • lead
  • uranium
Nuclei of isotopes differ in the number of
  • Electrons and neutrons
  • Protons and neutrons
  • Electrons and protons
  • Neutrons only

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  • A neutron
  • A deutron
  • A positron
  • An α − particle

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  • 2)
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Which of the following is used as neutron absorber in the nuclear reactor ?
  • Water
  • Deuterium
  • Some compound of Uranium
  • Cadmium
Which of the following elements belongs to 4 n – series
  • Pb – 207
  • Bi – 209
  • Pb – 208
  • Pb – 207

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  • 236, 92
  • 234, 90
  • 238, 90
  • 236, 90
If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be
  • 2 and 1
  • 3 and 1
  • 1 and 1
  • 1 and 3
India has the world’s largest deposits of thorium in the form of
  • rutile
  • magnesite
  • lignite
  • monazite

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  • atomic number
  • high proton to neutron ratio
  • high neutron to proton ratio
  • high electron to neutron ratio
0:0:1


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