NEET Chemistry - New - Structure of Atom and Nuclear Chemistry

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Question - 1

The angular momentum of electron in 'd' orbital is equal to:

  • A \(2\sqrt { 3 } \hbar\)
  • B \(\hbar\)
  • C \(\sqrt { 6 } \hbar\)
  • D \(\sqrt { 2 } \hbar\)

Question - 2

Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck's constant, h= 6.63 x 10-34Js, speed of light, c= 3 x 108 ms-1.) :

  • A 6.67 x 1015
  • B 6.67 x 1011
  • C 4.42 X 10-15
  • D 4.42 x 10-18

Question - 3

The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19J and bond energy per molecule is 4.0 x 10-19J. The kinetic energy of the molecule per atom will be :

  • A 2.0 x 10-20J
  • B 2.2 x 10-19J
  • C 2.0 x 10-19J
  • D 4.0 x 10-20J

Question - 4

The value of Planck's constant is 6.63 x 10-34 Js. The velocity of light is 3.0 x 108 ms-1, Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 x 1015 S-1?

  • A 4 x 101
  • B 3 x 107
  • C 2 x 10-25
  • D 5 x 10-18

Question - 5

The energy of photon is given as : \(\triangle \)E/atom= 3.03 x 10-19J atom-1, then the wavelength (\(\lambda \)) of the photon is:

  • A 6.56 nm
  • B 65.6 nm
  • C 656 nm
  • D 0.656 nm

Question - 6

If uncertainty in position and momentum are equal, then uncertainty in velocity is :

  • A \(\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } } \)
  • B \(\sqrt { \frac { h }{ 2\pi } } \)
  • C \(\frac { 1 }{ m } \sqrt { \frac { h }{ \pi } } \)
  • D \(\sqrt { \frac { h }{ \pi } } \)

Question - 7

Given, the mass of electron is 9.11 x 10-31kg, Planck's constant is 6.626x 10-34Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is :

  • A 5.79 x 106 ms-1
  • B 5.79 x 107ms-1
  • C 5.79 x 108 ms-1
  • D 5.79 x 105 ms-1

Question - 8

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionisation energy of H = 2.18 x 10-18J atom-1 and h = 6.625 x 10-34 Js):

  • A 1.03 x 1015s-1
  • B 2.00 x 1015s-1
  • C 3.08 x 1015s-1
  • D 1.54 x 1015s-1

Question - 9

In hydrogen atom, energy of first excited state is - 3.4 eV. Then, KE of same orbit of hydrogen atom is:

  • A + 3.4 eV
  • B + 6.8 eV
  • C -13.6 eV
  • D + 13.6 eV

Question - 10

Who modified Bohr's theory by introducing elliptical orbits for electron path?

  • A Hund
  • B Thomson
  • C Rutherford
  • D Sommerfeld