A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be
(h = 6.6 x 10^-34 Js)

• 6.6 x 10^-32 m

• 6.6 x 10^-34 m

• 1 x 10^-35 m

• 1 x 10^-35 m

Maximum number of electrons in a subshell of an atom is determined by the following

• 4l + 2

•  2l +1

• 4l-2

• 4l-2

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

• 2.0 x 10^-20 J 

• 2.2 x 10^-19 J

• 2.0 x 10^-19 J

• 2.0 x 10^-19 J

Which of the following is not permissible arrangement of electrons in an atom? 

• n = 4, l=0, m=0, s=-1/2

• n=5, l=3, m=0, s=+1/2

• n=3, l=2, m=-3, s= -1/2

• n=3, l=2, m=-3, s= -1/2

If uncertanity in position and momentum are equal, then uncertaninty in velocity is 

The measurment of the electron position is associated with an uncerrtanity in momentum, which equal to 1 x 10^-18 g cm s^-1.The uncertanity in electron velocity is,

(mass of an electrons is 9 x 10^-28 g) 

• 1 x 10⁸

• 1  x 10⁶ cm s^-1

•  1 x 10⁵ cm s^-1

•  1 x 10⁵ cm s^-1

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

• 5.79 x 10⁶ ms^-1

• 5.79 x 10⁷ ms^-1

• 5.79 x 10⁸ ms^-1

• 5.79 x 10⁸ ms^-1

The orientation of an atomic orbital is governed by:

• azimuthal quantum number

• spin quantum number

• magnetic quantum number

• magnetic quantum number

Which one is the wrong statement?

• de-Broglie's wavelength is given by λ = h/mv,
  where m = mass of the particle, v = group velocity of the particle

• The uncertainty principle is 

• Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

• Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

Which one is a wrong statement?

• Total orbital angular momentum of electron in 's' orbital is equal to zero

• An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

• The value of m for d_z2 is zero

• The electronic configuration of N atom is