In an atom the order of increasing energy of electrons with quant

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 Multiple Choice QuestionsMultiple Choice Questions

131.

The basis of quantum mechanical model of an atom is

  • angular momentum of electron

  • quantum numbers

  • dual nature of electron

  • black body radiation


132.

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

  • spin

  • azimuthal

  • magnetic

  • principal


133.

A compound absorbs light in the wavelength region 490-500 nm. Its complementary colour is

  • red

  • blue

  • orange

  • blue-green


134.

Which of the following sets of quantum numbers is correct for an electron in 3d-orbital?

  • n = 3; l = 2; m = -3; s = +12

  • n = 3; l = 3; m = +3; s = -12

  • n = 3; l = 2; m = -2; s = +12

  • n = 3; l = 2; m = -3; s = -12


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135.

If the kinetic energy of a particle is reduced to half, de-Broglie wavelength becomes

  • 2 times

  • 12 times

  • 4 times

  • 2 times


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136.

In an atom the order of increasing energy of electrons with quantum numbers

(i) n=4, l=1      (ii) n=4, l=0     (iii) n=3, l=2 and (iv) n=3, l=1 is

  • III < I <IV < II

  • II < IV < I<III

  • I <III <II <IV

  • IV< II <III <I


D.

IV< II <III <I

The order of increase of energy can be calculated from (n + l) rule. If two orbitals have same value of (n + l), the orbital with lower value of n will be filled first

() For n=4, l = 1, (n + l) = 4 + 1=5
(i) For n=4, l=0, (n + l) = 4 + 0 =4
(iii) For n =3 l = 2, (n + l) = 3 + 2=5
(v) For n = 3, l=1,(n+ l) = 3 + 1=4

Therefore correct order is IV< II <III <I.


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137.

The number of angular and radial nodes of 4d orbital respectively are

  • 3,1

  • 1,2

  • 3,0

  • 2,1


138.

The product of uncertainty in velocity and uncertainty in position of a micro particle of mass 'm' is not less than in which of the following?

  • h × 3πm

  • h3π× m

  • h4π × 1m

  • h4π × m


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139.

2p orbitals have

  • n = 1; l = 2

  • n = 1; l = 0

  • n = 2; l = 1

  • n = 2; l = 0


140.

Aufbau principle is not satisfied by

  • Cr and Cl

  • Cu and Ag

  • Cr and Mg

  • Cu and Na


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