CBSE
Multiple Choice QuestionsA 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
If n =6, the correct sequence for filling of electrons will be
ns → (n-1) d → ( n - 2)f → np
ns - (n-2)f → np → (n-1)d
ns - np → (n-1)d → (n-2)f
ns - np → (n-1)d → (n-2)f
The orbital angular momentum of p-electron is given as
The total number of atomic orbitals in fourth energy level of an atom is
16
32
4
8
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
Maximum number of electrons in a subshell of an atom is determined by the following
4l + 2
2l +1
4l-2
4l-2
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
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?
3s 4s 3p 3d
4s 3s 3p 3d
3s 3p 3d 4s
3s 3p 3d 4s
The energies E1 and E2 of two radiations are 25 eV respectively. The relation between their wavelength i.e., λ1 and λ2 will be
λ1 = 2λ2
λ1 = 4λ2
λ1 = λ2/2
λ1 = λ2/2
According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
n= 6 to n = 1
n = 5 to n = 4
n= 6 to n = 5
n= 6 to n = 5
