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

(a) λ1 = 2λ2

(b) λ1 = 4λ2 

(c) λ112λ2

(d) λ1 =

Concept Questions :-

EMT Radiation
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If the principal quantum number n=6, the correct sequence of filling of electrons will be:

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

 

 

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

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

(a) Ni3+                (b) Mn3+

(c) Fe3+                (d) Co3+

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Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states ?

(a) 3d3, 4s2

(b) 3d5, 4s1

(c) 3d5, 4s2

(d) 3d2, 4s2

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

(a) 4l+2

(b) 2l+ 1

(c) 4l - 2

(d) 2n2

Concept Questions :-

Shell/Subshell
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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:
1. 2.2×10-19J
2. 2.0×10-19J
3. 2.0×10-20J
4. 4.0×10-20J
 

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Planck's Theory
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Which of the following is not permissible arrangement of electrons in an atom ?

(a) n=4,l=0,m=0,s=-1/2

(b) n=5,l=3,m=0,s=+1/2

(c) n=3,l=2,m=-3,s=-1/2

(d) n=3,l=2,m=-2,s=-1/2

Concept Questions :-

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

(a) 12mhπ

(b) h2π

(c) 1mhπ

(d) hπ

Concept Questions :-

Heisenberg Uncertainity Principle
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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 electron velocity is,

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

(a) 1 x 109 cm s-1                     (b) 1 x 106 cm s-1

(c) 1 x 105 cm s-1                     (d) 1 x 1011 cm s-1

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Heisenberg Uncertainity Principle
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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?

(a) ii, iii and iv                              (b) i, ii, iii and iv

(c) ii, iv and v                               (d) i and iii

Concept Questions :-

Quantum Numbers
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