Wave nature of electrons was demonstrated by : from Chemistry St

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 Multiple Choice QuestionsMultiple Choice Questions

381.

72X180 2α β γ zXA , Z and A are :

  • 69 , 172

  • 172 , 69

  • 180 , 70

  • 182 , 68


382.

Assertion : The quantized energy of an electron is largely determined by its principal quantum number.

Reason : The principal quantum number n is a measure of the most probable distance of finding the electron around the nucleus.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


383.

Assertion : C- O bond in metal carbonyl is long.

Reason : There is delocalisation of electrons from filled d orbitals into the empty orbitals on the CO ligands.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false.


384.

Isotopic pair is :

  • 20X4021X40

  • 20X40 , 20X41

  • 40X2041X20

  • None


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385.

Atomic number of an element is equal to the number of :

  • protons

  • neutrons

  • electrons

  • protons + neutrons


386.

Radioactive isotope of hydrogen is :

  • Uranium

  • Deuterium

  • Tritium

  • None


387.

Electronk configuration of hydride ion is :

  • 1so

  • 1s1

  • 1s2

  • 1s12s1


388.

The de Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is

  • 6.626 × 10-34 m.

  • 13.20 × 10-34 m.

  • 10.38 × 10-21m.

  • 6.626 ×10-34A°.


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389.

Wave nature of electrons was demonstrated by :

  • Schrodinger

  • De-Broglie

  • Davisson and Garmer

  • Heisenberg


B.

De-Broglie

Wave-nature of electrons was first , demonstrated by de-Broglie's who gave following equation for the wave-length of electrons :

λ = h


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390.

U92238 emits 8 α-particles and 6 β-particles. The neutron/proton ratio in the product nucleus is

  • 60/41

  • 61/40

  • 62/41

  • 61/42


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