Structure of Atom · Question 37

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

1. 5, 1, 1, + 12
2. 6, 0, 0, + 12
3. 5, 0, 0, + 12
4. 5, 1, 0, + 12

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ?

1. n = 6 to n = 1
2. n = 5 to n = 4
3. n = 6 to n = 5
4. n = 5 to n = 3

The total number of atomic orbitals in fourth energy level of an atom is

1. 8
2. 16
3. 32
4. 4

The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., 1 and 2 will be

1. 1 = 2
2. 1 = 2 2
3. 1 = 4 2
4. 1 = 12 2

If n = 6, the correct sequence for filling of electrons will be

1. ns (n-2)f (n-1)d np
2. ns (n-1)d (n-2)f np
3. ns (n-2)f np (n-1)d
4. ns np (n-1)d (n-2)f

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

1. 6.6 10-32 m
2. 6.6 10-34 m
3. 1.0 10-35 m
4. 1.0 10-32 m

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

1. 2 + 1
2. 4 - 2
3. 2n2
4. 4 + 2

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

1. n = 5, = 3, m = 0, s = +1/2
2. n = 3, = 2, m = -3, s = -1/2
3. n = 3, = 2, m = -2, s = -1/2
4. n = 4, = 0, m = 0, s = -1/2

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

1. 1m h
2. h
3. 12m h
4. h2

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 10-18 g cm s-1. The uncertainty in electron velocity is (mass of an electron is 9 10-28 g)

1. 1 105 cm s-1
2. 1 1011 cm s-1
3. 1 109 cm s-1
4. 1 106 cm s-1