The momentum of a particle having a de-Broglie wavelength of 10-7 m is
(Given h = 6.625×10-34 m)
3.3125×10-7 kg m s-1
26.5×10-7 kg m s-1
6.625×10-17 kg m s-1
13.25×10-7 kg m s-1
The electronic configuration of Cu (atomic number 29) is
1s2,2s2,2p6,3s2,3p6,4s2,3d9
1s2,2s2,2p6,3s2,3p6,3d10,4s1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,5s2,5p1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,3d3
The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 are
2
4
6
8
Which of the following statements do not form a part of Bohr's model of hydrogen atom ?
Energy of the electrons in the orbits are quantised
The electron in the orbit nearest the nucleus has the lowest energy
Electrons revolve in different orbits around the nucleus
The position and velocity of electrons in the orbit cannot be determined simultaneously
The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is
6.63×10-33 m
6.63×10-34 m
6.63×10-35 m
6.63×10-36 m
The orbitals are called degenerate when
they have the same wave functions
they have the same wave functions but different energies
they have different wave functions but same energy
they have the same energy
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 = -2, s = -1/2
The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol-1, hence the energy of fourth Bohr orbit would be
-41 kJ mol-1
-1312 kJ mol-1
-164 kJ mol-1
-82 kJ mol-1
The energy of an electron in the nth Bohr orbit of hydrogen atom is
The energy absorbed by each molecule (A2 ) of a substance is 4.4× 10-19 J and bond energy per molecule is 4.0× 10-19 J. The kinetic energy of the molecule per atom will be
2.0× 10-20 J
2.2× 10-19 J
2.0× 10-19 J
4.0× 10-20 J
