Structure of Atom

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

  

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s² 2s² 2p³, the simplest formula for this compound is

• Mg₂X₃

• MgX₂

• Mg₃X₂

• Mg₂X

Among the following set of quantum numbers, the impossible set is

• n	l	m	s
  3	2	-3	-1/2

• n	l	m	s
  4	0	0	1/2

• n	l	m	s
  5	3	0	-1/2

• n	l	m	s
  3	2	-2	1/2

Match the type of series given in Column I with the wavelength range given in Column II and choose the correct option.

• A	B	C	D
  1	2	4	3

• A	B	C	D
  4	3	1	2

• A	B	C	D
  3	1	2	4

• A	B	C	D
  4	3	2	1

The electrons identified by quantum numbers n and l, are as follows

1. n =4, l=1

2. n = 4, l = 0

3. n =3, l= 2

4. n = 3, l = 1

If we arrange them in order of increasing energy, i.e., from lowest to highest, the correct order is

• IV<II<III<I

• II<IV<I<III

• I < III < II < IV

• III < I < IV < II