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How many unpaired electrons are present in Ni²⁺ cation (atomic number = 28)
1. 0
2. 2
3. 4
4. 6

Supposing the energy of the fourth shell for the hydrogen atom is -50a.u. (Arbitrary unit). What would be its ionization potential-
1. 50
2. 800
3. 15.4
4. 20.8

An element with atomic mass Z consists of two isotopes of mass number Z-1 and Z + 2. The percentage abundance of the heavier isotope is -
1. 0.25
2. 33.3
3. 66.6
4. 75

Calculate the wavenumber of lines having the frequency of 5 x 10¹⁶ cycles per sec. 
1. 1.666 x 10⁸m^-1 
2. 0.666 x 10⁸m^-1
3. 4.126 x 10⁶m^-1
4. 3.133 x 10⁴m^-1

The  energy needed to convert helium atom  to He ⁺² is -79eV. The first ionization energy of this atom is about 
1. 65.4eV
2. 51.8eV
3. 24.6eV
4. 27.2eV

The most probable radius (in pm) for finding the electron in He⁺ is -
1. 0
2. 52.9
3. 26.5
4. 105.8

The mass ratio of photons corresponding to the first lines of the Lymann and the Balmer series of the atomic spectrum of hydrogen is :

Arrange the following particles in increasing order of values of e/m ratio: Electron(e), proton(p), neutron(n) and α-particle(α)
1. n,p,e,α
2. n,α,p,e
3. n,p,α,e
4. e,p,n,α

If the size of the first orbit of the hydrogen atom is 5.29 nm, the size of the second orbit of He⁺ is
1. 2.65 nm
2. 21.16 nm
3. 10.58 nm
4. 5.29 nm

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n=4 to n=2 in the He⁺ spectrum?
1. n =4 to n=2
2.  n = 3 to n=2
3.  n =3 to n=1
4.  n =2 to n=1

Magnetic moment of 2.83 BM is given by which of the following ions?
(At no: Ti=22; Cr=24; Mn=25; Ni=28)
1. Ti³⁺                 
2. Ni²⁺
3. Cr³⁺                 
4. Mn²⁺

The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x 10¹⁷ nms^-1.
Which value is closest to the wavelength in nanometer of a quantum of light with the
frequency of 6 x 10¹⁵ s^-1?
1. 10
2. 25
3. 50
4. 75

The maximum number of electrons in a subshell with l = 3 and n = 4 is
1. 14
2. 16
3. 10
4. 12

The angular momentum of an electron in d orbital is equal to
1. $\sqrt{6} \sout{\mathrm{h}}$
2. $\sqrt{2} \mathrm{h}$
3. $2\sqrt{3} \mathrm{h}$
4. 0 h

The correct order of the total number of nodes of atomic orbitals is: 
1.  4f > 6s > 5d
2.  6s > 5d > 4f
3.  4f > 5d > 6s
4.  5d > 4f > 6s

Maximum number of total nodes is present in:
1.  5s
2.  5p
3.  5d
4.  All have same number of nodes

Orbitals having two spherical nodes are: 

The wave mechanical model of the atom depends upon
1.  De-Broglie concept of dual nature of electron
2.  Heisenberg uncertainty principle
3.  Schrodinger's principle
4.  All

The H-spectrum show:
1.  Heisenberg's uncertainty principle
2.  Diffraction
3.  Polarization
4.  Presence of quantized energy level

In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the:
1. Wavelength of incident light.
2. Frequency of incident light.
3. Velocity of incident light.
4. Atomic mass of an element.

 The largest de Broglie wavelength among the following (all have equal velocity) is: 
1.  ${\mathrm{CO}}_2$ molecule
2.  ${\mathrm{NH}}_3$ molecule
3.  Electron
4.  Proton