291.

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.

Column I		Column II
A	Lyman	1.	Ultraviolet
B.	Paschen	2.	Near-infrared
C.	Balmer	3.	Far Infrared
D.	Pfund	4.	Visible

• 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

What will be the number of waves formed by a Bohr electron in one complete revolution in its second orbit?

• Three

• Two

• One

• Zero

Match the particle with its characteristic

Column I	Column II
A. $\mathrm{\alpha }$-particle	p. Slow moving
B. Isobar	q. High penetration power
C. $\mathrm{\gamma }$- ray	r. Same atomic mass
D. $\mathrm{\beta }$- particle	s. consists of electron

• A - p; B - r; C - q; D - s

• A - p; B - q; C - r; D - s

• A - r; B - s; C - p; D - q

• A - s; B - r; C - p; D - q