Which one of the following ions has electronic configuration [Ar]3d6?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

  • Ni3+               

  • Mn3+

  • Fe3+               

  • Co3+

Which one of the elements with the following outer orbital configurations may exhibit the

largest number of oxidation states ?

  • 3d3, 4s2

  • 3d5, 4s1

  • 3d5, 4s2

  • 3d2, 4s2

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

  • 4l + 2

  • 2l + 1

  • 4l - 2

  • 2n2

The energy absorbed by each molecule(A2) of a substance is 4.4×10-19J and bond energy per molecule is 4.0×10-19J the  energy of the molecule per atom will be:
 
  • 2.2×10-19J
  • 2.0×10-19J
  • 2.0×10-20J
  • 4.0×10-20J

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=-2,s=-1/2

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

  •  12mhπ

  •  h2π

  •  1mhπ

  •  hπ

The measurement of the electron position is associated with an uncertainty in momentum which is equal to 1x10-18 g cm s-1. The uncertainty in velocity of the electron will be:

(mass of an electron is 9 x 10-28 g)

  • 1 x 109 cm s-1                     

  • 1 x 106 cm s-1

  • 1 x 105 cm s-1                     

  • 1 x 1011 cm s-1

Consider the following sets of quantum numbers:

              n         l         m         s

(i)         3         0         0          +1/2

(ii)        2         2         1          +1/2

(iii)       4         3        -2           -1/2

(iv)       1         0        -1           -1/2

(v)        3         2         3           +1/2

Which of the following sets of quantum numbers is not possible?

  • ii, iii and iv                             

  • i, ii, iii and iv

  • ii, iv and v                               

  • i and iii

Which one of the following ions is the most stable in aqueous solution?

(At no. Ti=22, V=23, Cr=24, Mn=25)

  • Cr3+                         

  • V3+

  • Ti3+                         

  • Mn3+

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 105 ms-1

The orientation of an atomic orbital is governed by:

  • azimuthal quantum number

  • spin quantum number

  • magnetic quantum number

  • principal quantum number

An electronic configuration representing an atom in the excited state is

1. 1s2,2s22p1                     2. 1s2,2s22p23. 1s2,2s22p2,3s1             4. 1s2,2s22p5
  • 1
  • 2
  • 3
  • 4

How does the energy gap between successive energy levels in an atom vary from low to high n values?

  • All energy gaps are the same

  • The energy gap decreases as  n increases

  • The energy gap increases as  n  increases 

  • The energy gap changes unpredictably as  n  increases

Iodine molecule dissociates into atoms after absorbing light of 4500 A∘. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. Bond energy of I2 is 240 kJ mol-1.

  •  2.16×10-20 J

  •  0.16×10-20 J

  •  5.03×10-20 J

  •  8.32×10-20 J

How many electrons can fit in the subshell for which n = 3 and l = 1?

  •   2

  •   6

  •   10

  •   14

A pair of d-orbitals having electron density along the axes is

  •  dz2, dxz

  •  dxz, dzy

  •  dz2, dx2-y2

  •  dxy, dx2-y2

The Incorrect statement among the following is



       

  • Total orbital angular momentum of an 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 electronic configuration of N atom is 
  • The value of m for dz2 is zero.

The angular momentum of electrons in d orbital is equal to 
  •  6 h
  •  2h
  •  23 h
  • 0 h

What is the maximum number of orbitals that can be identified with the following quantum numbers:
n = 3, l = 1, m = 0

  • 1

  • 2

  • 3

  • 4

The value of Planck's constant is 6.63 × 10–34 Js. The speed of light is 3 × 1017 nm s–1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 1015 s–1 ?
 
  • 25
  • 50
  • 75
  • 10

Maximum number of electrons in a sub shell with l = 3 and n = 4 is

  • 14

  • 16

  • 10

  • 12

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

  •   16

  •   32

  •   4

  •   8

The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelenghs i.e., λ1 and λ2 will be

  •   λ1=2λ2

  •   λ1=4λ2

  •   λ1=12λ2

  •   λ1=λ2

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

  •   ns → n-1 d → n-2 f → np

  •   ns - n-2 f → np → n-1 d

  •   ns - np → n-1d → n-2 f

  •   ns → n-2 f → n-1 d → np

An element, X has the following isotopic composition : 
200X: 90% 
199X: 8.0% 
202X: 2.0% 
The weighted average atomic mass of the naturally-occurring element X is closest to:

  • 200 amu

  • 201 amu

  • 202 amu

  • 199 amu

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

  •   5f>6p>4d>5p

  •   5f>6p>5p>4d

  •   6p>5f>5p>4d

  •   6p>5f>4d>5p

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

  •   Brackett series

  •   Lyman series

  •   Balmer series

  •   Paschen series

The orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is

  •   

  •   

  •   

  •   

If the electronic structure of oxygen atom is written as 1s2, 2s2  it would violate

  •   Hund's rule

  •   Paulis exclusion principle

  •   Both Hund's and Pauli's principles

  •   None of the above

The correct order of the total number of nodes of atomic orbitals is

  •   4f > 6s > 5d

  •   6s > 5d > 4f

  •   4f > 5d > 6s

  •   5d > 4f > 6s

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